WO2020003787A1 - 色変換素子及び照明装置 - Google Patents

色変換素子及び照明装置 Download PDF

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Publication number: WO2020003787A1
Authority: WO; WIPO (PCT)
Prior art keywords: fluorescent; color conversion; light; section; substrate
Prior art date: 2018-06-28

Application number

PCT/JP2019/019375

Other languages

English (en)

French (fr)

Japanese (ja)

Inventor

孝典明田

洋介本多

平野　徹

雅司石丸

Original Assignee

パナソニックＩｐマネジメント株式会社

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2018-06-28

Filing date

2019-05-15

Publication date

2020-01-02

2019-05-15 Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社

2020-01-02 Publication of WO2020003787A1 publication Critical patent/WO2020003787A1/ja

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Classifications

- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
- F21V7/30—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings the coatings comprising photoluminescent substances
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
- F21V9/38—Combination of two or more photoluminescent elements of different materials
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements

Definitions

the present invention relates to a color conversion element in which a phosphor layer is laminated on a substrate, and a lighting device including the same.
illumination is performed by irradiating a laser beam transmitted by a light guide member as excitation light to a color conversion element in which a fluorescent portion is stacked, thereby causing the fluorescent portion to emit light, converting the fluorescent portion into a desired light color, and illuminating.
a color conversion element in which a resin contains phosphor particles that emit light having different wavelengths and which are stacked in different layers has been developed (for example, see Patent Document 1).
the resin that binds the phosphor particles may be degraded by the heat. Deterioration of the resin makes the fluorescent portion itself unstable, and consequently causes a decrease in the color of emitted light.
an object of the present invention is to suppress a decrease in the color of emitted light.
a color conversion element includes a substrate, and a color conversion unit disposed on the substrate, wherein the color conversion unit includes a first fluorescent unit disposed on a main surface of the substrate, A second fluorescent portion divided at predetermined intervals along the substrate in the fluorescent portion, the first fluorescent portion converts at least a first phosphor that converts light of a predetermined wavelength into light of another wavelength.
the second fluorescent portion includes a plurality of second phosphor particles that convert light having a predetermined wavelength into light having a longer wavelength than the first phosphor particles.
a lighting device includes the above-described color conversion element and a light source unit that emits light of a predetermined wavelength emitted toward the color conversion element.
FIG. 1 is a schematic diagram illustrating a schematic configuration of the lighting device according to the first embodiment.
FIG. 2 is a sectional view illustrating a schematic configuration of the color conversion element according to the first embodiment.
FIG. 3 is a cross-sectional view of a section taken along line III-III in FIG.
FIG. 4 is a cross-sectional view illustrating a color conversion unit according to the first modification.
FIG. 5 is a cross-sectional view illustrating a schematic configuration of a color conversion element according to Modification 2.
FIG. 6 is a cross-sectional view illustrating a schematic configuration of a color conversion element according to Modification 3.
FIG. 7 is a cross-sectional view illustrating a schematic configuration of a color conversion element according to Modification 4.
FIG. 1 is a schematic diagram illustrating a schematic configuration of the lighting device according to the first embodiment.
FIG. 2 is a sectional view illustrating a schematic configuration of the color conversion element according to the first embodiment.
FIG. 3 is
FIG. 8 is a cross-sectional view illustrating a schematic configuration of a color conversion element according to Modification Example 5.
FIG. 9 is a cross-sectional view illustrating a schematic configuration of the color conversion element according to the second embodiment.
FIG. 10 is a sectional view showing a schematic configuration of the color conversion element according to the third embodiment.
FIG. 11 is a cross-sectional view of the section taken along line XI-XI in FIG.
FIG. 12 is a cross-sectional view illustrating a color conversion unit according to the sixth modification.
FIG. 13 is a cross-sectional view illustrating a schematic configuration of a color conversion element according to Modification 7.
FIG. 14 is a cross-sectional view illustrating a schematic configuration of a color conversion element according to Modification 8.
FIG. 15 is an explanatory diagram illustrating a main configuration of a lighting device according to Embodiment 4.
FIG. 16 is an explanatory diagram illustrating a part of the manufacturing process of the color conversion element
each drawing is a schematic diagram, and is not necessarily strictly illustrated.
the same components are denoted by the same reference numerals.
FIG. 1 is a schematic diagram illustrating a schematic configuration of a lighting device 1 according to the first embodiment.
the lighting device 1 includes a light source unit 2, a light guide member 3, and a color conversion element 4.
the light source unit 2 is a device that generates light of a predetermined wavelength and supplies the light to the color conversion element 4 via a light guide member 3 such as an optical fiber.
the light source unit 2 is a semiconductor laser element that emits blue laser light L having a wavelength of blue-violet to blue (430 to 490 nm).
the color conversion element 4 is a light-emitting element that emits white light to the surface side using the blue laser light L transmitted from the light guide member 3 and irradiated from the surface side of the color conversion element 4 as excitation light.
FIG. 2 is a cross-sectional view illustrating a schematic configuration of the color conversion element 4 according to the first embodiment.
FIG. 2 is a cross-sectional view of the color conversion element 4 viewed from a direction perpendicular to the normal line of the substrate 41.
the color conversion element 4 includes a substrate 41, a bonding section 42, a reflection section 45, and a color conversion section 43.
a substrate 41, a bonding section 42, a reflection section 45, and a color conversion section 43 are stacked in this order.
the substrate 41 is a substrate having a rectangular or circular shape in plan view, for example.
the substrate 41 is a substrate having a higher thermal conductivity than the color conversion unit 43.
the heat conducted from the color conversion unit 43 can be efficiently radiated from the substrate 41.
the substrate 41 is formed from a metal material such as Cu and Al.
the substrate 41 may be formed of a material other than a metal material as long as the substrate 41 has a higher thermal conductivity than the color conversion unit 43. Examples of materials other than metal materials include ceramics, glass, and sapphire. Ceramics include silicon nitride, aluminum nitride, and the like.
a heat sink such as a mirror heat sink, may be attached to the substrate 41 in order to further enhance heat dissipation.
the bonding portion 42 is an adhesive layer interposed between the substrate 42 and the reflection portion 45 for bonding the substrate 42 and the reflection portion 45.
the joint 42 is formed of, for example, a resin adhesive.
the bonding portion may be a bonding portion for performing metal nano bonding between the color conversion portion 43 and the substrate 41.
the bonding portion is formed of a metal material capable of performing metal nano bonding.
the joint is formed by sintering metal nanoparticles. Examples of the metal nanoparticles include silver nanoparticles and copper nanoparticles. When silver nanoparticles, copper nanoparticles, or the like are used, they are easily available and have excellent heat dissipation. If the joining portion is formed of a metal material, the reflecting portion 45 can be omitted because the joining portion itself reflects light.
the reflection section 45 is interposed between the joining section 42 and the color conversion section 43.
the reflection section 45 is formed in advance on the main surface of the color conversion section 43 on the substrate 41 side.
the reflection unit 45 is a reflection film that reflects the light emitted by the color conversion unit 43.
the reflection unit 45 is, for example, a reflective film for adjusting a refractive index, a dichroic mirror, or the like.
the reflection section 45 is formed of a metal material such as Au, Ag, Ni, Pd, or Ti, or an SIO 2 / TiO 2 laminate.
the reflection section 45 is formed by forming a metal material or the like on the main surface of the color conversion section 43 on the substrate 41 side by a film forming method such as sputtering or plating.
the color conversion unit 43 is arranged on one main surface side of the substrate 41.
the color converter 43 is formed in the same shape as the substrate 41 in a plan view.
the color conversion unit 43 includes, for example, phosphor particles (first phosphor particles 441 and second phosphor particles 461) that emit fluorescence when excited by laser light in a dispersed state, and the blue laser light L
the first phosphor particles 441 and the second phosphor particles 461 emit fluorescence. These fluorescent lights are mixed with the blue laser light L and emitted from the outer main surface of the color conversion unit 43. For this reason, the outer main surface of the color conversion unit 43 becomes the light emitting surface.
the color conversion section 43 includes a first fluorescent section 44 and a second fluorescent section 46.
the first fluorescent section 44 is a layer arranged on one main surface side of the substrate 41. Specifically, the first fluorescent section 44 is a layer directly overlapping the reflecting section 45. A concave portion 443 is formed in the first fluorescent portion 44 on the main surface on the substrate 41 side.
FIG. 3 is a cross-sectional view of the section taken along line III-III in FIG.
a lattice-shaped recess 443 is formed on the main surface of the first fluorescent section 44 on the substrate 41 side.
the concave portion 443 is formed by performing a groove process such as a dicing process on the first fluorescent portion 44 having a uniform thickness as a whole before processing. Note that the concave portion 443 does not have to be a lattice shape, and may be, for example, a stripe shape or a multiple ring shape.
the concave portion 443 is filled with the second fluorescent portion 46.
the first phosphor section 44 includes a plurality of first phosphor particles 441 in a dispersed state using the translucent first inorganic material 442 as a binder.
the plurality of first fluorescent particles 441 are solidified by the first inorganic material 442. That is, the first fluorescent section 44 includes the first inorganic material 442 including at least the first phosphor particles 441 as the first phosphor.
the first phosphor particles 441 are phosphor particles that convert light of a predetermined wavelength into light of another wavelength.
the first phosphor particles 441 are phosphor particles that emit yellow light when irradiated with the blue laser light L.
the first phosphor particles 441 for example, phosphor particles of yttrium aluminum garnet (YAG) are used.
the second fluorescent part 46 is filled in the concave part 443 of the first fluorescent part 44.
the second fluorescent portion 46 is a single member as a whole, but at a predetermined portion, a predetermined interval is provided along the substrate 41. It appears to be divided (see FIG. 2). Also in this case, it is assumed that the second fluorescent section 46 is divided at predetermined intervals along the substrate 41. That is, the second fluorescent portion 46 may be a single member as a whole, as long as it is partially divided in the cross-sectional view shown in FIG.
the second fluorescent portion 46 includes a plurality of second fluorescent particles 461 in a dispersed state using the translucent second inorganic material 462 as a binder.
the plurality of second fluorescent particles 461 are solidified by the second inorganic material 462. That is, the second fluorescent portion 46 includes the second inorganic material 462 including at least the second phosphor particles 461 as the second phosphor.
the second phosphor particles 461 are phosphor particles that convert light having a predetermined wavelength into light having a longer wavelength than the first phosphor particles 441.
the second phosphor particles 461 are phosphor particles that emit red light when irradiated with the blue laser light L.
the second phosphor particles 461 for example, CASN or SCASN phosphor (phosphor having a basic composition of (Sr, CA) AlSiN 3 : Eu) is adopted.
each of the first fluorescent section 44 and the second fluorescent section 46 may include a polycrystal or a single crystal of one kind of phosphor.
a polycrystal or a single crystal can be used as the phosphor particles.
the first inorganic material 442 and the second inorganic material 462 include, for example, SiO 2 -based glass and transparent ceramics containing alumina.
the first inorganic material 442 and the second inorganic material 462 may be the same inorganic material or different inorganic materials.
the blue laser light L When the blue laser light L is emitted from the light source unit 2 via the light guide member 3 to the color conversion unit 43 of the color conversion element 4, the blue laser light L enters the first fluorescent unit 44. Part of the blue laser light L that has entered the first fluorescent section 44 hits the first phosphor particles 441 and is converted into yellow light. At this time, the temperature of the first fluorescent section 44 becomes high, but the influence is small because the first inorganic material 442 having higher heat resistance than the resin is used as the binder. That is, the first fluorescent section 44 can maintain stable color conversion performance for a long time.
the other blue laser light L that has entered the first fluorescent section 44 enters the second fluorescent section 46.
the blue laser light L that has entered the second fluorescent section 46 strikes the second phosphor particles 461 and is converted into red light.
the temperature of the second fluorescent portion 46 is increased, but the effect is small since the second inorganic material 462 having higher heat resistance than the resin is used as the binder. That is, the second fluorescent section 46 can also maintain stable color conversion performance for a long time.
the second fluorescent section 46 is divided at predetermined intervals along the substrate 41, and the first fluorescent section 44 is arranged within this interval. As described above, since the first fluorescent portion 44 and the second fluorescent portion 46 are discretely arranged along the substrate 41, while the blue laser light L having high directivity is diffused in the color conversion portion 43, Color conversion can be performed.
the reflecting portion 45 reflects the yellow light, the red light and the blue laser light L toward the light emitting surface. Some of these reflected lights are subjected to color conversion by hitting the first phosphor particles 441 or the second phosphor particles 461 before being emitted from the light emitting surface.
the blue laser light L, yellow light, and red light are emitted to the outside from the color conversion unit 43, they are mixed to emit white light with high color rendering properties.
the first fluorescent portion 44 and the second fluorescent portion 46 discretely arranged along the substrate 41 diffuse the blue laser light L in the color conversion portion 43, the white light also The entire conversion unit 43 is made uniform.
light having a shorter wavelength has a property of being easily absorbed by a phosphor that converts into light having a longer wavelength. That is, in the case of the present embodiment, yellow light is easily absorbed by the second phosphor particles 461.
the concave portion 443 of the first fluorescent portion 44 is provided on the light emitting surface side, and the concave portion 443 is filled with the second fluorescent portion 46.
the second fluorescent section 46 may exist on the optical path from the first fluorescent section 44 to the light emitting surface. Therefore, there is a high possibility that the yellow light emitted from the first fluorescent unit 44 passes through the second fluorescent unit 46 before reaching the light emitting surface.
the yellow light impinges on the second phosphor particles 461 by passing through the second fluorescent portion 46 and is converted into red light. This is a phenomenon called secondary absorption. When the secondary absorption occurs, the color balance may be lost and a desired white light may not be obtained.
a concave portion 443 is provided on the main surface of the first fluorescent portion 44 on the substrate 41 side, and the concave portion 443 is filled with the second fluorescent portion 46. Due to such an arrangement, the second fluorescent portion 46 does not easily exist on the optical path from the first fluorescent portion 44 to the light emitting surface. Therefore, the yellow light emitted from the first fluorescent section 44 is less likely to pass through the second fluorescent section 46 before reaching the light emitting surface, so that the occurrence of secondary absorption is also suppressed. This makes it easier to obtain desired white light.
the color conversion element 4 includes the substrate 41 and the color conversion unit 43 disposed on the substrate 41, and the color conversion unit 43 is disposed on the main surface of the substrate 41. And a second fluorescent section 46 divided at a predetermined interval along the substrate 41 in the first fluorescent section 44, and the first fluorescent section 44 has a predetermined wavelength.
a first inorganic material 442 including at least a first phosphor (first phosphor particles 441) that converts light into light of another wavelength is provided, and the second fluorescent unit 46 converts light of a predetermined wavelength into first fluorescent light.
a second phosphor (second phosphor particles 461) that converts the light into light having a longer wavelength than the body particles 441 is included.
the illumination device 1 includes the color conversion element 4 and a light source unit 2 that emits light of a predetermined wavelength emitted toward the color conversion element 4.
the first fluorescent material 44 since the first fluorescent material is included in the first inorganic material 442 having higher heat resistance than the resin, the first fluorescent material 44 has the second fluorescent material as compared with the case where the resin is used as the binder.
One fluorescent section 44 can be stabilized. Therefore, a decrease in the tint of the emitted light can be suppressed.
the second fluorescent section 46 is divided at a predetermined interval along the substrate 41, and the first fluorescent section 44 is disposed within this interval.
the fluorescent portions 46 are discretely arranged along the substrate 41. Therefore, color conversion can be performed while the blue laser light L having high directivity is diffused in the color conversion unit 43, and uniform white light can be emitted in the entire color conversion unit 43. Further, since the blue laser light L is diffused by the color conversion unit 43, the influence of heat on the first fluorescent unit 44 and the second fluorescent unit 46 due to the blue laser light L can be further suppressed.
the second fluorescent portion 46 includes a second inorganic material 462 for solidifying the plurality of second fluorescent particles 461.
the plurality of second fluorescent particles 461 are solidified by the second inorganic material 462 having higher heat resistance than the resin, so that the case where the resin is used as the binder is Even in comparison, the second fluorescent section 46 can be stabilized. Therefore, a decrease in the tint of the emitted light can be suppressed.
a resin may be used as the binder.
the first fluorescent portion 44 has a concave portion 443 formed on the main surface on the substrate 41 side, and the second fluorescent portion 46 is filled in the concave portion 443.
the concave portion 443 is provided on the main surface of the first fluorescent portion 44 on the substrate 41 side, and since the concave portion 443 is filled with the second fluorescent portion 46, light is emitted from the first fluorescent portion 44.
the second fluorescent part 46 is unlikely to exist on the optical path to the surface. Therefore, the yellow light emitted from the first fluorescent section 44 is less likely to pass through the second fluorescent section 46 before reaching the light emitting surface, so that the occurrence of secondary absorption is also suppressed. This makes it easier to obtain desired white light.
the second fluorescent section 46 does not exist outside the concave section 443. That is, the second fluorescent part 46 is not interposed between the first fluorescent part 44 and the substrate 41 at the site.
a fluorescent portion including red phosphor particles (corresponding to the second fluorescent portion 46 in the present embodiment) is a fluorescent portion including yellow phosphor particles (corresponding to the first fluorescent portion 44 in the present embodiment).
a reflection unit 45 is laminated on the main surface of the color conversion unit 43 on the substrate 41 side.
the reflection portion 45 is directly laminated on the main surface of the color conversion portion 43 on the substrate 41 side, light reaching the main surface of the color conversion portion 43 on the substrate 41 side is reflected by the reflection portion 45. The light can be reflected in the color conversion unit 43. Therefore, it is possible to suppress the leakage light, and it is possible to suppress a decrease in the output of the white light.
FIG. 4 is a cross-sectional view illustrating the color conversion unit 43a according to the first modification.
FIG. 4 is a diagram corresponding to FIG.
a plurality of concave portions 443 a arranged in a matrix are formed on the main surface of the first fluorescent portion 44 a on the substrate 41 side.
the concave portion 443a is formed by subjecting the first fluorescent portion 44a having a uniform thickness as a whole to a hole processing such as masking or drilling.
Masking includes, for example, masking by metal mask or resist printing. Drilling includes blasting, etching and the like.
the second fluorescent portion 46a is formed.
FIG. 4 illustrates the case where the planar shape of the second fluorescent portion 46a is rectangular, but the second fluorescent portion 46a may be a polygonal shape other than a rectangular shape, a circular shape, or an elliptical shape. You may.
each of the divided second fluorescent portions 46 is formed in a rectangular shape in the cross-sectional view shown in FIG. 2 has been exemplified.
the sectional shape of each of the divided second fluorescent portions may be any shape.
FIG. 5 is a cross-sectional view illustrating a schematic configuration of a color conversion element 4B according to a second modification. Specifically, FIG. 5 is a diagram corresponding to FIG. As shown in FIG. 5, in the color conversion section 43b of the color conversion element 4B, each of the divided second fluorescent sections 46b has a triangular shape in a sectional view. Specifically, each of the divided second fluorescent portions 46b has an isosceles triangular shape in cross-sectional view, and is arranged such that the bottom side faces the substrate 41 side. A concave portion 443b corresponding to the second fluorescent portion 46b is formed in the first fluorescent portion 44b of the color conversion portion 43b.
FIG. 6 is a cross-sectional view illustrating a schematic configuration of a color conversion element 4C according to a third modification. Specifically, FIG. 6 is a diagram corresponding to FIG. As shown in FIG. 6, in the color conversion section 43c of the color conversion element 4C, each of the divided second fluorescent sections 46c has a semicircular shape in a cross-sectional view, and is arranged such that the plane section faces the substrate 41 side. Have been. A concave portion 443c corresponding to the second fluorescent portion 46c is formed in the first fluorescent portion 44c of the color conversion portion 43c.
the second fluorescent portions 46b and 46c have a cross-sectional shape that tapers toward the opposite side to the substrate 41.
the second fluorescent portions 46b and 46c have a cross-sectional shape that tapers toward the opposite side to the substrate 41, the second fluorescent portions 46b and 46c can be compared with the second fluorescent portion 46 having a rectangular shape in cross section. It is possible to easily fill the concave portions 443b and 443c of the first fluorescent portions 44b and 44c.
a portion that receives the blue laser light L is mainly a front end face.
the portion mainly receiving the blue laser light L is the entire outer surface of the tapered portion. That is, in the second fluorescent portions 46b and 46c, the area of the portion mainly receiving the blue laser light L can be larger than that of the second fluorescent portion 46 having a rectangular cross section. Therefore, the irradiation density of the blue laser light L on the second fluorescent portions 46b and 46c can be reduced, and the occurrence of the luminance saturation phenomenon of the second fluorescent portions 46b and 46c can be suppressed.
the luminance saturation phenomenon of the second fluorescent portions 46b and 46c is one of the causes of lowering the conversion efficiency, the output of the white light, and the color rendering property of the white light. Can be suppressed.
the second fluorescent portion 46 is disposed in the first fluorescent portion 44 at a position exposed from the main surface on the substrate 41 side.
the second fluorescent section may be arranged at any position as long as the second fluorescent section is divided at a predetermined interval along the substrate in the first fluorescent section.
FIG. 7 is a cross-sectional view illustrating a schematic configuration of a color conversion element 4D according to Modification 4. Specifically, FIG. 7 is a diagram corresponding to FIG. As shown in FIG. 7, in the color conversion section 43d of the color conversion element 4D, the divided second fluorescent section 46d is arranged at an intermediate position in the thickness direction of the first fluorescent section 44d. The second fluorescent section may be arranged at a position exposed on the light emitting surface side of the first fluorescent section.
FIG. 8 is a cross-sectional view illustrating a schematic configuration of a color conversion element 4E according to Modification 5.
FIG. 8 is a diagram corresponding to FIG.
the irradiation range R1 is a range in which the blue laser light L is irradiated on the color conversion unit 43e. That is, in the irradiation range R1, the installation density of the second fluorescent portions 46d is smaller than in the other ranges.
the irradiation range R1 may be provided with a second fluorescent portion 46e. Even in this case, the installation density of the second fluorescent portion 46e is set lower than in other ranges.
the installation density is a ratio occupied by the second fluorescent portion 46e per unit area in a plan view.
the blue laser light L is applied to the irradiation range R1, but is scattered in the color conversion unit 43e. Therefore, part of the blue laser light L reaches the second fluorescent portion 46e outside the irradiation range R1, and is converted into red light. The other blue laser light L is converted into yellow light by the first fluorescent section 44e, and then enters the second fluorescent section 46e to be converted into red light.
the installation density of the second fluorescent unit 46e is smaller than in the other ranges.
the installation density of the second fluorescent portions 46e is lower than in other ranges, so that the second fluorescent portions 46e excited by the blue laser light L can be reduced. Therefore, the irradiation density of the blue laser light L on the second fluorescent portion 46e can be reduced, and the occurrence of the luminance saturation phenomenon of the second fluorescent portion 46e can be suppressed.
FIG. 9 is a sectional view illustrating a schematic configuration of the color conversion element 104 according to the second embodiment. Specifically, FIG. 9 is a cross-sectional view of the color conversion element 104 viewed from a direction perpendicular to the normal line of the substrate 141. As shown in FIG. 9, the color conversion element 104 includes a substrate 141, a bonding section 142, and a color conversion section 143.
the substrate 141 is a substrate having a rectangular or circular shape in plan view, for example.
the substrate 141 has a higher thermal conductivity than the color conversion unit 143.
the heat conducted from the color conversion unit 143 can be efficiently radiated from the substrate 141.
the substrate 141 is formed from a metal material such as Cu and Al.
the substrate 141 may be formed of a material other than a metal material as long as the substrate 141 has a higher thermal conductivity than the color conversion unit 143. Examples of materials other than metal materials include ceramics, glass, and sapphire. Ceramics include silicon nitride, aluminum nitride, and the like.
a heat sink such as a mirror heat sink may be attached to the substrate 141 in order to further enhance heat radiation.
the reflection film 1411 is a reflection film that reflects the light emitted by the color conversion unit 143.
the reflection film 1411 is, for example, a reflection-enhancing film for adjusting a refractive index, a dichroic mirror, or the like.
the reflection film 1411 is formed of a metal material such as Au, Ag, Ni, Pd, or Ti, or an SIO 2 / TiO 2 laminate.
the reflective film 1411 is formed by forming a metal material on one main surface of the substrate 141 by a film forming method such as sputtering or plating.
the bonding section 142 is an adhesive layer interposed between the color conversion section 143 and the reflection film 1411 to bond the color conversion section 143 and the substrate 141.
the joint 142 is formed of, for example, a resin adhesive.
the bonding portion may be a bonding portion for performing metal nano bonding between the color conversion portion 143 and the substrate 141.
the bonding portion is formed of a metal material capable of performing metal nano bonding.
the joint is formed by sintering metal nanoparticles. Examples of the metal nanoparticles include silver nanoparticles and copper nanoparticles. When silver nanoparticles, copper nanoparticles, or the like are used, they are easily available and have excellent heat dissipation. If the joint is formed from a metal material, the reflective film 1411 can be omitted because the joint itself reflects light.
the color conversion unit 143 is disposed on one main surface side of the substrate 141.
the color conversion unit 143 is formed in the same shape as the substrate 141 in a plan view.
the color conversion unit 143 includes, for example, phosphor particles (red phosphor particles 1441 and yellow phosphor particles 1461) that emit fluorescence when excited by a laser beam in a dispersed state, and emit the blue laser beam L. Accordingly, the red phosphor particles 1441 and the yellow phosphor particles 1461 emit fluorescence. These fluorescent lights are mixed with the blue laser light L to become white light. The white light is emitted from the outer main surface of the color conversion unit 143. Therefore, the outer main surface of the color conversion unit 143 becomes a light emitting surface.
the color conversion section 143 includes a red fluorescent section 144, a reflective section 145, and a yellow fluorescent section 146.
the red fluorescent section 144 is a layer directly overlapping the bonding section 142.
the red fluorescent section 144 is an example of a second fluorescent section.
the red fluorescent section 144 includes a large number of red phosphor particles 1441 in a dispersed state using a translucent inorganic material or a translucent resin material as a binder.
the light-transmitting inorganic material include glass and transparent ceramics.
the translucent resin material include a silicone resin, an epoxy resin, and a urea resin.
the red phosphor particles 1441 are phosphor particles that emit red light when irradiated with yellow light.
CASN or SCASN phosphor phosphor having a basic composition of (Sr, CA) AlSiN 3 : Eu
the reflection section 145 is a layer that reflects the blue laser light L and transmits yellow light and red light.
the reflecting section 145 is arranged on the side of the red fluorescent section 144 opposite to the substrate 141. Specifically, the reflecting section 145 is directly overlaid on the main surface of the red fluorescent section 144 on the opposite side of the red fluorescent section 144 so as to cover the entire main surface on the side opposite to the substrate 141.
the reflection unit 145 is, for example, a reflective film for adjusting the refractive index, a dichroic mirror, or the like.
the reflection section 145 is formed of a metal material such as Au, Ag, Ni, Pd, or Ti, or an SIO 2 / TiO 2 laminate.
the yellow fluorescent part 146 is a layer directly overlapping the reflective part 145.
the yellow fluorescent section 146 is an example of a first fluorescent section.
the yellow fluorescent portion 146 includes a large number of yellow fluorescent particles 1461 in a dispersed state using a translucent inorganic material or a translucent resin material as a binder.
the yellow phosphor particles 1461 are phosphor particles that emit yellow light when irradiated with the blue laser light L.
YAG yttrium aluminum garnet
each of the red fluorescent section 144 and the yellow fluorescent section 146 may be a polycrystal or a single crystal of one kind of phosphor.
the blue laser light L When the blue laser light L is emitted from the light source unit 2 via the light guide member 3 to the color conversion unit 143 of the color conversion element 104, the blue laser light L enters the yellow fluorescent unit 146. Part of the blue laser light L that has entered the yellow fluorescent section 146 hits the yellow phosphor particles 1461, and the other blue laser light L is reflected by the reflecting section 145. Of the reflected blue laser light L, a part of the blue laser light L strikes the yellow phosphor particles 1461, and the other blue laser light L is emitted from the yellow fluorescent part 146 to the outside.
the blue laser light L that has hit the yellow phosphor particles 1461 is converted into yellow light by the yellow phosphor particles 1461.
a part of the yellow light passes through the reflection part 145 and enters the red fluorescent part 144, and the other yellow light is emitted from the yellow fluorescent part 146 to the outside.
the yellow light transmitted through the reflecting section 145 enters the red fluorescent section 144.
Part of the yellow light that has entered the red fluorescent section 144 hits the red phosphor particles 1441, and the other yellow light is reflected by the reflective film 1411 via the bonding section 142.
the reflected yellow light some yellow light hits the red phosphor particles 1441, and the other yellow light is emitted to the outside via the reflection section 145 and the yellow phosphor section 146.
Red light hitting the red phosphor particles 1441 is converted into red light by the red phosphor particles 1441.
a part of the converted red light is directly emitted to the outside via the reflecting part 145 and the yellow fluorescent part 146.
the rest of the converted red light is reflected by the reflection film 1411 via the bonding portion 142 and indirectly emitted to the outside via the reflection portion 145 and the yellow fluorescent portion 146.
the red phosphor particles 1441 of the red phosphor 144 are excited only by yellow light and emit red light. That is, the red phosphor particles 1441 are not excited by the blue laser light L. This can suppress the occurrence of the luminance saturation phenomenon of the red phosphor particles 1441.
the blue laser light L, the yellow light, and the red light are emitted to the outside from the color conversion unit 143, they are mixed to emit white light having high color rendering properties.
the color conversion element 104 includes the substrate 141 and the color conversion unit 143 disposed on the substrate 141, and receives the blue laser light L from the outside and converts it into white light.
a color conversion section 143 for conversion the color conversion section 143 is disposed on the main surface of the substrate 141, and emits red light by being irradiated with yellow light;
a reflection portion 145 is disposed on the opposite side to the red fluorescent portion 144, and is disposed on the opposite side of the reflection portion 145 from the red fluorescent portion 144 so as to cover the red fluorescent portion 144.
a yellow fluorescent portion 146 that emits yellow light when irradiated.
the reflecting portion 145 reflects the blue laser light L and transmits yellow light and red light.
the lighting device 1 includes the color conversion element 104 and the light source unit 2 that emits the blue laser light L applied to the color conversion element 104.
the reflecting portion 145 reflects the blue laser light L and transmits the yellow light and the red light, the blue laser light L having high directivity and high excitation density does not enter the red fluorescent portion 144.
yellow light from the yellow fluorescent section 146 caused by the blue laser light L passes through the reflecting section 145 and enters the red fluorescent section 144. Since the yellow light from the yellow fluorescent section 146 has lower directivity and excitation density than the blue laser light L, even if the red phosphor particles 1441 are excited by the yellow light, the luminance of the red phosphor particles 1441 is increased. The saturation phenomenon is unlikely to occur.
the red phosphor particles 1441 can efficiently convert yellow light into red light as compared with the case where the blue laser light L is applied to the red phosphor particles 1441.
the red light emitted from the red phosphor particles 1441 passes through the reflector 145, is emitted to the outside from the yellow phosphor 146, is mixed with the blue laser light L and the yellow light, and becomes white light.
the red light is emitted efficiently, the output of the white light and the color rendering of the white light are also enhanced.
the second embodiment has exemplified the color conversion element 104 in which the red fluorescent section 144 is formed in a uniform layer as a whole.
a color conversion element 104A in which a red fluorescent portion is divided at predetermined intervals along the substrate 141 will be exemplified.
the same portions as those in the second embodiment are denoted by the same reference numerals, and description thereof may be omitted.
FIG. 10 is a sectional view showing a schematic configuration of a color conversion element 104A according to the third embodiment.
FIG. 10 is a diagram corresponding to FIG.
the red fluorescent section 144a provided in the color conversion section 143a of the color conversion element 104A is divided at predetermined intervals along the substrate 141.
each of the divided red fluorescent portions 144a is formed in a rectangular shape in a cross-sectional view shown in FIG.
each of the divided red fluorescent portions 144a is individually covered by a reflecting portion 145a.
a yellow fluorescent section 146a is arranged within a predetermined interval. The yellow fluorescent portion 146a is close to the substrate 141 via the bonding portion 142 and the reflection film 1411 within the interval.
FIG. 11 is a cross-sectional view of the section taken along line XI-XI in FIG.
a lattice-shaped concave portion 1462a is formed on the main surface of the yellow fluorescent portion 146a on the bonding portion 142 side.
the concave portion 1462a is formed by subjecting the yellow fluorescent portion 146a having a uniform thickness as a whole to groove processing such as dicing.
the concave portion 1462a may not be in a lattice shape, and may be, for example, a stripe shape or a multiple ring shape.
the concave portion 1462a After providing the reflecting portion 145a on the inner surface of the concave portion 1462a, the concave portion 1462a is filled with a binder containing a large number of red phosphor particles 1441 to form the red fluorescent portion 144a.
the concave portion 1462a since the red fluorescent portion 144a is covered with the reflective portion 145a, even if the blue laser light L is irradiated from the yellow fluorescent portion 146a side, the reflective portion 145a is not covered by the blue laser light. L is reflected to block the entry of the blue laser light L into the red fluorescent section 144a.
the yellow light emitted from the yellow fluorescent portion 146a side passes through the reflecting portion 145a, and thus the red fluorescent portion 144a is excited by the yellow light to emit red light.
the red light is transmitted through the reflecting section 145a and is emitted outward through the yellow fluorescent section 146a. That is, outside the color conversion element 104A, red light, blue laser light L and yellow light are mixed to emit white light.
the red fluorescent portion 144a when viewed from the normal direction of the substrate 141, the red fluorescent portion 144a is a single member as a whole, but at a predetermined portion, a predetermined interval is provided along the substrate 141. It appears to be divided (see FIG. 10). Also in this case, it is assumed that the red fluorescent section 144a is divided at predetermined intervals along the substrate 141.
the red fluorescent section 144a is divided at predetermined intervals along the substrate 141, and the reflecting section 145 separates each of the divided red fluorescent sections 144a. , And the yellow fluorescent portions 146a are arranged at intervals.
the red fluorescent section 144a is located between the yellow fluorescent section 146a and the substrate 141 in the relevant portion. Does not intervene.
the red fluorescent portion 144a has a lower heat dissipation than the yellow fluorescent portion 146a, but if the red fluorescent portion 144a is not interposed between the yellow fluorescent portion 146a and the substrate 141, the yellow fluorescent portion 146a Heat can be smoothly transmitted to the substrate 141. Therefore, it is possible to suppress the temperature of the color conversion unit 143a from becoming high, and as a result, it is possible to further suppress the conversion efficiency, the output of the white light, and the color rendering of the white light.
FIG. 12 is a cross-sectional view illustrating a color conversion unit 143b according to the sixth modification. Specifically, FIG. 12 is a diagram corresponding to FIG. As shown in FIG. 12, in the cross-sectional view as viewed from the normal direction of the substrate 141, a plurality of concave portions 1462b arranged in a matrix are formed on the main surface of the yellow fluorescent portion 146b on the bonding portion 142 side. .
the concave portion 1462b is formed by subjecting the yellow fluorescent portion 146b having a uniform thickness as a whole to hole processing such as masking or drilling.
Masking includes, for example, masking by metal mask or resist printing. Drilling includes blasting, etching and the like.
the concave portion 1462b is filled with a binder containing a large number of red phosphor particles 1441 to form the red fluorescent portion 144b.
the red fluorescent portion 144b may be a polygonal shape other than a rectangular shape, a circular shape, or an elliptical shape. Good.
each of the divided red fluorescent portions 144a is formed in a rectangular shape in a sectional view shown in FIG.
the sectional shape of each of the divided red fluorescent portions 144c may be any shape.
FIG. 13 is a cross-sectional view illustrating a schematic configuration of a color conversion element 104C according to Modification 7. Specifically, FIG. 13 is a diagram corresponding to FIG. As shown in FIG. 13, in the color conversion section 143c of the color conversion element 104C, each of the divided red fluorescent sections 144c has a triangular shape in a cross-sectional view. A concave portion 1462c corresponding to the red fluorescent portion 144c is formed in the yellow fluorescent portion 146c of the color conversion portion 143c.
FIG. 14 is a cross-sectional view illustrating a schematic configuration of a color conversion element 104D according to Modification 8. Specifically, FIG. 14 is a diagram corresponding to FIG. As illustrated in FIG. 14, in the color conversion unit 143d of the color conversion element 104D, each of the divided red fluorescent units 144d has a semicircular shape in a cross-sectional view. A concave portion 1462d corresponding to the red fluorescent portion 144d is formed in the yellow fluorescent portion 146d of the color conversion portion 143d.
the number of sides orthogonal to the substrate 141 is smaller than that in the case of a rectangular shape. For this reason, it is possible to easily cover the red fluorescent portion 144c having a triangular cross section or the red fluorescent portion 144d having a semicircular shape with the reflecting portions 145c and 145d.
FIG. 15 is an explanatory diagram illustrating a main configuration of a lighting device 1E according to Embodiment 4.
FIG. 15 shows a cross-sectional view of the color conversion element 104E.
a lighting device 1E according to Embodiment 4 is provided with a condenser lens 9e that collects the blue laser light L emitted from the light guide member 3.
the condenser lens 9e is arranged such that the optical axis of the condenser lens 9e is coaxial with the optical axis of the blue laser light L emitted from the light guide member 3.
the blue laser light L is incident on the color conversion unit 143e of the color conversion element 104E at an incident angle ⁇ by being collected by the condenser lens 9e.
the color conversion unit 143e of the color conversion element 104E includes a red fluorescent unit 144e, a reflective unit 145e, and a yellow fluorescent unit 146e.
the red fluorescent section 144e is a layer that directly overlaps the bonding section 142, and has a truncated conical through-hole 1445e.
the through hole 1445e is disposed coaxially with the optical axis of the condenser lens 9e.
the through hole 1445e is formed so as to taper toward the joint 142.
the inner peripheral surface forming the through hole 1445e in the red fluorescent section 144e is inclined at an angle corresponding to the incident angle ⁇ .
the reflecting portion 145e is stacked on the inner peripheral surface forming the through hole 1445e in the red fluorescent portion 144e.
the reflecting portion 145e covers the entire inner peripheral surface of the red fluorescent portion 144e.
the yellow fluorescent section 146e is fitted into the through hole 1445e of the red fluorescent section 144e via the reflection section 145e.
the yellow fluorescent section 146e is arranged on the opposite side of the reflective section 145 from the red fluorescent section 144e so as to cover the entire reflective section 145.
the yellow fluorescent portion 146e is formed in a truncated cone shape corresponding to the through hole 1445e. That is, the outer peripheral surface of the yellow fluorescent section 146e is inclined at an angle corresponding to the incident angle ⁇ of the blue laser light L with respect to the color conversion section 143e. As a result, the yellow fluorescent portion 146e has a shape corresponding to the incident angle ⁇ . For this reason, the yellow fluorescent portion 146e has a shape that substantially matches the blue laser light L condensed by the condensing lens 9e.
substantially matching includes not only perfect matching, but also matching including an error of several percent.
the red fluorescent portion 144e is covered with the reflective portion 145e, even if the blue laser light L is irradiated from the yellow fluorescent portion 146e side, the reflective portion 145e remains in the blue laser portion. The light L is reflected to block the blue laser light L from entering the red fluorescent section 144e.
the yellow light emitted from the yellow fluorescent portion 146e by the blue laser light L passes through the reflecting portion 145e, the red fluorescent portion 144e is excited by the yellow light to emit red light. Part of the red light is transmitted through the reflecting portion 145e and emitted outward through the yellow fluorescent portion 146e. Others of the red light are directly emitted outward from the red fluorescent section 144e. That is, outside the color conversion element 104E, red light, blue laser light L and yellow light are mixed to emit white light.
FIG. 16 is an explanatory diagram showing a part of the manufacturing process of the color conversion element 104E according to the fourth embodiment.
a yellow phosphor plate 146e having a shape corresponding to the incident angle ⁇ is formed by cutting a yellow phosphor plate that has been formed in a rectangular shape in advance by, for example, cutting processing (see FIG. 16A).
a reflecting portion 145e is formed on the outer peripheral surface of the yellow fluorescent portion 146e by, for example, forming a thin film (see FIG. 16B).
the red fluorescent section 144e is formed by, for example, printing so that the outer peripheral surface of the reflective section 145e is sealed.
a plate-shaped color conversion unit 143e is formed as a whole (see FIG. 16C).
the substrate 141 having the reflective film 1411 is superimposed on one main surface (the upper main surface in FIG. 16C) of the color conversion unit 143e.
the reflection film 1411 and the color conversion unit 143e are joined by the joining unit 142.
the color conversion element 104E is completed (see FIG. 15).
the yellow fluorescent section 146e has a shape corresponding to the incident angle ⁇ of the blue laser light L with respect to the color conversion section 143e.
the yellow fluorescent portion 146e since the yellow fluorescent portion 146e has a shape corresponding to the incident angle ⁇ , the yellow fluorescent portion 146e can be contained within the irradiation range of the blue laser light L to the color conversion portion 143e. Thereby, the yellow fluorescent portion 146e can be made to substantially match the blue laser light L, and the yellow fluorescent portion 146e can be made as small as possible. Since the yellow fluorescent section 146e is more expensive than the red fluorescent section 144e, the cost can be reduced.
the incident angle ⁇ of the blue laser light L to the color conversion unit 143e may be 60 degrees or more.
the side surface of the yellow fluorescent section 146e is also inclined at an angle corresponding to the incident angle ⁇ . That is, since the side surface of the yellow fluorescent section 146e is relatively gently inclined, the film can be easily formed when the reflecting section 145e is formed on the yellow fluorescent section 146e. This makes it easier for the reflecting section 145e to adhere to the yellow fluorescent section 146e, so that the reflecting performance of the reflecting section 145e can be improved.
the color conversion element 4 is applied to the illumination device 1 as an example.
the color conversion element 4 can be used for other illumination systems.
Other illumination systems include, for example, projectors, headlights for vehicles, and the like.
the color conversion element 4 is used as a phosphor wheel.
the reflection unit 45 is provided on the main surface of the color conversion unit 43 on the substrate 41 side.
a reflection section may be provided on the main surface of the substrate on the color conversion section side.
a joining portion is interposed between the color conversion portion and the reflecting portion, and these are joined.
a reflection suppressing layer such as an AR coating layer may be laminated on the outer main surface of the color conversion unit 43, that is, the light emitting surface. Thereby, the light extraction efficiency can be increased.
the first fluorescent portion 44 in which the plurality of first fluorescent particles 441 are solidified by the first inorganic material 442 has been illustrated.
the first fluorescent portion may be formed of a first fluorescent material obtained by sintering only a plurality of first fluorescent material particles and integrally forming the whole.
the integrated first phosphor is a “first inorganic material containing at least the first phosphor”.
the second fluorescent portion 46 in which the plurality of second phosphor particles 461 are solidified by the second inorganic material 462 has been illustrated.
the second fluorescent portion may be formed from a second fluorescent material obtained by sintering only a plurality of the second fluorescent material particles and integrating them as a whole.
the integrated second phosphor is a “second inorganic material containing at least the second phosphor”.

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PCT/JP2019/019375 2018-06-28 2019-05-15 色変換素子及び照明装置 WO2020003787A1 (ja)

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Publication	Publication Date	Title
WO2012014360A1 (ja)	2012-02-02	発光モジュール
JP5226077B2 (ja)	2013-07-03	発光モジュール、発光モジュールの製造方法、および灯具ユニット
JP6302762B2 (ja)	2018-03-28	発光装置および照明装置
JP5152502B2 (ja)	2013-02-27	灯具
RU2636410C2 (ru)	2017-11-23	Светоизлучающий прибор
JP5606922B2 (ja)	2014-10-15	発光モジュールおよび灯具ユニット
JP6785458B2 (ja)	2020-11-18	光源装置
JP5395097B2 (ja)	2014-01-22	発光モジュールおよび灯具ユニット
JP6371201B2 (ja)	2018-08-08	発光モジュール及びそれを用いた発光装置
WO2010044239A1 (ja)	2010-04-22	発光モジュール、発光モジュールの製造方法、および灯具ユニット
KR20180107203A (ko)	2018-10-01	파장 변환 부재, 그 제조 방법 및 발광 장치
JP2010287687A (ja)	2010-12-24	発光モジュールおよび発光モジュールの製造方法
US20200144466A1 (en)	2020-05-07	Light-emitting device and method of manufacturing the same
JP2019521487A (ja)	2019-07-25	熱伝導性の蛍光取り出しドームを備えたレーザベース光源
KR101917703B1 (ko)	2019-01-29	형광체 모듈
WO2020003787A1 (ja)	2020-01-02	色変換素子及び照明装置
JP2008205170A (ja)	2008-09-04	発光半導体デバイス
JP6266796B2 (ja)	2018-01-24	発光装置、照明装置、スポットライト、車両用前照灯、および内視鏡
US11043789B2 (en)	2021-06-22	Light emitting device
JP2002299692A (ja)	2002-10-11	反射型ｌｅｄ光源
JP6888129B2 (ja)	2021-06-16	発光装置
JP2020136672A (ja)	2020-08-31	発光装置
KR20180112601A (ko)	2018-10-12	형광체 모듈
JP2024066549A (ja)	2024-05-16	蛍光体デバイス及び発光装置
JP2020136671A (ja)	2020-08-31	発光装置

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