WO2015020205A1 - 発光装置 - Google Patents
発光装置 Download PDFInfo
- Publication number
- WO2015020205A1 WO2015020205A1 PCT/JP2014/071057 JP2014071057W WO2015020205A1 WO 2015020205 A1 WO2015020205 A1 WO 2015020205A1 JP 2014071057 W JP2014071057 W JP 2014071057W WO 2015020205 A1 WO2015020205 A1 WO 2015020205A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- light emitting
- side wall
- phosphor
- emitting device
- Prior art date
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Images
Classifications
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- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/32—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures
- H01S5/323—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/32308—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm
- H01S5/32341—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm blue laser based on GaN or GaP
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Definitions
- the present invention relates to a light emitting device.
- a synthetic resin cover in which a phosphor is kneaded is provided above the light emitting diode, and the phosphor that absorbs a part of the light emitted from the light emitting diode and the light emitted from the light emitting element.
- An apparatus that produces white light in combination with fluorescence emitted from a light source is known (see, for example, Patent Document 1).
- Patent Document 1 in the light emitting device described in Patent Document 1, since the synthetic resin cover including the phosphor is separated from the light emitting diode, it is difficult to cause deterioration due to light or heat emitted from the light emitting diode. It is said that the lifetime of the light emitting device can be extended.
- the phosphor absorbs light emitted from the light emitting element and generates heat due to a difference (energy difference) between the wavelength of light from the light emitting element and the wavelength of fluorescence.
- a difference energy difference
- the quantum efficiency associated with wavelength conversion of the phosphor is 1, when absorbing blue light having a wavelength of 450 nm and emitting yellow fluorescence having a wavelength of 560 nm, about 20% of the absorbed energy is changed to heat. When absorbing blue light with a wavelength of 450 nm and emitting red fluorescence with a wavelength of 650 nm, about 30% of the absorbed energy is converted into heat.
- the quantum efficiency of the phosphor is less than 1, more energy is converted into heat.
- the phosphor has a temperature quenching characteristic in which the amount of emitted light decreases as the temperature rises.
- the magnitude of temperature quenching directly affects the luminous efficiency of the light emitting device. Therefore, in order for a light emitting device using a phosphor to have high luminous efficiency, it is extremely important to suppress temperature rise of the phosphor during use and to suppress temperature quenching as much as possible. Further, the temperature rise of the phosphor causes a change in the absorption rate of light emitted from the light emitting element and a change in the fluorescence spectrum, resulting in a change in the emission color of the light emitting device. It is important to suppress the temperature rise of the phosphor in order to suppress the color change in the use state and the use environment. For example, it is desirable that the temperature when the phosphor emits light is less than 100 ° C.
- one of the objects of the present invention is to use a remote phosphor that is suitable for a lighting device such as a projector that requires a large amount of light with a high luminance, and that has little decrease in emission intensity and little change in emission color during use.
- the object is to provide a light emitting device.
- One embodiment of the present invention provides the following [1] to [20] light emitting devices to achieve the above object.
- a light emitting element that emits light having a peak wavelength of 480 nm or less, a phosphor layer that can convert a wavelength of light emitted from the light emitting element, and a heat dissipation member that discharges heat generated in the phosphor layer.
- the phosphor layer includes a single crystal phosphor, a ceramic phosphor, a layer made of glass containing phosphor particles, or a layer containing a transparent substrate and a resin layer containing phosphor particles formed on the surface thereof.
- the phosphor layer is a layer directly connected to the heat radiating member that covers the upper side and the side of the light emitting element, or an adhesive layer that covers the upper side of the light emitting element and surrounds the light emitting element.
- the side wall is a first side wall or a second side wall, and the first side wall is an insulating base surrounding the LED element, and the LED element side of the base is A metal layer formed on the side surface of the metal layer,
- the heat dissipation member and the adhesive layer are in contact with each other, the second side wall is made of ceramic or metal that is in contact with the heat dissipation member and the adhesive layer, the adhesive layer is made of resin containing particles,
- a light-emitting device which is a resin layer having a higher thermal conductivity than that of the resin, or a layer made of solder.
- the phosphor layer is a layer connected to the side wall via the adhesive layer, the heat dissipation member includes a metal pad to which the light emitting element is electrically connected, and the side wall
- the phosphor layer is a layer connected to the side wall via the adhesive layer, the side wall is the second side wall made of metal, and the light emitting element is insulated from the heat dissipation member.
- the phosphor layer is a layer connected to the side wall via the adhesive layer, and the heat radiating member is made of the same material as the base made of ceramic of the first side wall. Any one of [1] to [3], including a member formed integrally with the base of the side wall or a member formed integrally with the second side wall from the same material as the second side wall.
- the light emitting device according to item.
- the phosphor layer is a layer connected to the side wall via the adhesive layer, and the heat dissipation member is in contact with the base body made of ceramic of the first side wall or the second side wall.
- the light emitting device according to any one of [1] to [3], further including a reflector that opens above the light emitting element.
- the light emitting element heat dissipating member for discharging heat of the light emitting element is further provided, and the heat dissipating member and the light emitting element heat dissipating member are thermally separated.
- the transparent substrate has a thermal conductivity of 1 W / (m ⁇ K) or more, and a transmittance with respect to the emission wavelength and fluorescence wavelength of the light-emitting element of 80% or more.
- the light-emitting device of any one of.
- the phosphor layer is a layer connected to the side wall via the adhesive layer, and the phosphor layer has a metal film in a portion in contact with the adhesive layer on the surface, and the adhesive layer
- the light emitting device according to any one of [1] to [3], wherein is made of solder.
- the phosphor layer is a layer connected to the side wall via the adhesive layer, and the phosphor layer is disposed on a portion in contact with the adhesive layer on the light emitting element side surface.
- the light-emitting device according to any one of [1] to [3], wherein the light-emitting device has unevenness with a depth of 10% or more of the thickness of the layer.
- the phosphor layer is a layer connected to the side wall via the adhesive layer, and the side wall is fixed to the heat radiating member with screws, any one of the above [1] to [3]
- the phosphor layer is a layer connected to the side wall through the adhesive layer, and the thermal conductivity of the adhesive layer is 3 W / (m ⁇ K) or more, [1] to [1] [3] The light-emitting device according to any one of [3].
- the phosphor layer is a layer directly connected to the heat radiating member, a structure in which a lower portion of the phosphor layer is fitted in a groove formed on the upper surface of the heat radiating member, and an upper surface of the heat radiating member.
- a screw groove formed on a side surface of the groove and a screw groove formed on a lower side surface of the phosphor layer, or a screw groove formed on an upper side surface of the heat dissipation member and the phosphor layer The light-emitting device according to [1], wherein the light-emitting device has a structure that is screw-fixed by a screw groove formed on an inner side surface of the lower part.
- the phosphor layer is a layer including a transparent substrate and a resin layer including phosphor particles formed on the surface thereof, and a mass percent concentration of the phosphor particles in the resin layer is 50% by mass.
- the light-emitting device according to any one of [1] to [3] above.
- a light-emitting device using a remote phosphor that is suitable for a lighting apparatus that requires a large amount of light with a high luminance such as a projector, and that has little decrease in light emission intensity or change in light emission color during use. be able to.
- FIG. 1A is a top view of the light emitting device according to the first embodiment.
- FIG. 1B is a vertical cross-sectional view of the light emitting device taken along line AA in FIG. 1A.
- FIG. 2 is a vertical cross-sectional view of the light emitting device according to the second embodiment.
- FIG. 3A is a vertical sectional view of a modification of the light emitting device according to the second embodiment.
- FIG. 3B is a vertical cross-sectional view of a modification of the light emitting device according to the second embodiment.
- FIG. 4A is a vertical sectional view of a modification of the light emitting device according to the second embodiment.
- FIG. 4B is a vertical cross-sectional view of a modification of the light emitting device according to the second embodiment.
- FIG. 5 is a partially enlarged vertical sectional view of the light emitting device according to the third embodiment.
- FIG. 6A is a partially enlarged vertical sectional view of the light emitting device according to the fourth embodiment.
- FIG. 6B is a partially enlarged perspective view of the phosphor layer according to the fourth embodiment.
- FIG. 7 is a vertical sectional view of the light emitting device according to the fifth embodiment.
- FIG. 8A is a vertical cross-sectional view of the light emitting device according to the sixth embodiment.
- FIG. 8B is a vertical sectional view of the light emitting device according to the sixth embodiment.
- FIG. 9 is a vertical sectional view of the light emitting device according to the sixth embodiment.
- FIG. 10 is a vertical sectional view of the light emitting device according to the example.
- FIG. 1A is a top view of the light emitting device according to the first embodiment.
- FIG. 1B is a vertical cross-sectional view of the light emitting device taken along line AA in FIG. 1A.
- the light emitting device 10 is a light emitting device using a remote phosphor.
- the remote phosphor is a technique in which the phosphor layer and the light emitting element are separated from each other in the light emitting device.
- the light emitting device 10 is fixed to the side wall 13 via the metal pad 11, the LED element 12 mounted on the metal pad 11, the side wall 13 surrounding the LED element 12, and the adhesive layer 14, and above the LED element 12. And a phosphor layer 15 that can convert the wavelength of light emitted from the LED element 12.
- the side wall 13 has an insulating base 13b surrounding the LED element 12 and a metal layer 13a formed on the side face of the base 13b on the LED element 12 side.
- the metal layer 13 a contacts the metal pad 11 and the adhesive layer 14.
- a dotted line in FIG. 1A represents the position of the metal layer 13 a below the phosphor layer 15.
- the metal pad 11 is a member made of a metal such as Cu or Al, and power is supplied to the LED element 12 from the outside through the metal pad 11.
- the metal pad 11 is, for example, a lead frame.
- the metal pad 11 has a region 11a and a region 11b which are electrically separated.
- LED element 12 emits light having a peak wavelength of 480 nm or less.
- Stokes loss at the time of wavelength conversion by the phosphor is large, and the amount of heat generated by the phosphor is large. For this reason, it is important to effectively exhaust the heat generated in the phosphor layer 15.
- the LED element 12 is a face-down type LED chip, and includes a substrate 12b and a crystal layer 12a.
- the substrate 12b is, for example, a conductive substrate such as a SiC substrate, a GaN substrate, or a gallium oxide substrate.
- the crystal layer 12a is a layer formed by epitaxial growth on the substrate 12b, and has a light emitting layer sandwiched between an n-type semiconductor layer and a p-type semiconductor layer.
- As the material of the crystal layer 12a for example, an InGaN crystal, a GaN crystal, an AlGaN crystal, or an AlN crystal is used according to the emission wavelength of the LED element 12.
- the LED element 12 is electrically connected to the region 11a and the region 11b of the metal pad 11 through a wire 16 connected to the substrate 12b and an electrode (not shown) formed on the bottom surface of the crystal layer 12a.
- the wire 16 is made of, for example, Au, Al, Ag, or Cu.
- the light emitting device 10 may include a plurality of LED elements 12.
- the electrical connection of the plurality of LED elements may be a series circuit, a parallel circuit, or a combination circuit of a series circuit and a parallel circuit.
- the radiant flux density is large (for example, 1.8 W / cm 2 or more), The effect is particularly obtained when heat is easily generated in the phosphor layer 15.
- the light radiant flux density is a radiant flux density of light emitted from the LED element 12 and incident on the phosphor layer 15, and the total radiant flux [W] of the LED element 12 is used for wavelength conversion of the phosphor layer 15. It is divided by the area [cm 2 ] of the contributing region.
- a face-up type LED element may be used.
- a face-up type LED element which has a structure in which a light emitting layer portion epitaxially grown on a sapphire substrate is physically peeled from a sapphire substrate and attached to a conductive substrate such as a Si substrate or a CuW metal substrate. Good.
- the substrate of the LED element may not be conductive.
- each P electrode and N electrode of the LED element is electrically connected to a metal pad corresponding to the polarity using different conductive wires.
- the flip-chip type LED element is connected to the metal pad 11 through, for example, conductive bumps connected to the n-type semiconductor layer and the p-type semiconductor layer of the crystal layer.
- the effect of the present embodiment can be obtained regardless of the form of the LED element.
- another light emitting element such as a laser element may be used instead of the LED element 12.
- the base 13b of the side wall 13 is made of, for example, a thermosetting resin such as a silicone resin or an epoxy resin, or a ceramic such as Al 2 O 3 , AlN, Si 3 N 4 , or BN.
- the metal layer 13a on the surface of the side wall 13 is made of a metal having a high thermal conductivity and a high reflectance.
- the metal layer 13a is preferably made of Ag, Al, or Cu having a high reflectance on the surface.
- the metal layer 13a is formed by, for example, plating or vapor deposition on the surface of the pressed substrate.
- the side wall 13 is a part of the package of the light emitting device 10, for example.
- the metal layer 13 a is in contact with the metal pad 11 and the adhesive layer 14, and can transmit heat generated in the phosphor layer 15 and transmitted to the adhesive layer 14 to the metal pad 11.
- the heat of the phosphor layer 15 can be directly received and transmitted to the metal pad 11.
- the metal pad 11 functions as a heat radiating member and can discharge heat to the outside.
- the metal layer 13a has at least two electrically separated regions as represented by the solid line and the dotted line in FIG. 1A, and each region is one of the region 11a and the region 11b of the metal pad 11. Touch only one side. This is to prevent the circuit of the LED element 12 from being short-circuited by the metal layer 13a.
- the adhesive layer 14 is made of a resin containing particles such as high heat conductive grease or high heat conductive paste, or solder.
- a resin containing particles such as high heat conductive grease or high heat conductive paste, or solder.
- the particles contained in the resin may be any of metal particles, semiconductor particles, and insulator particles, but are added to improve the thermal conductivity of the adhesive layer 14, so that High thermal conductivity is required. Therefore, the thermal conductivity of the particles needs to be 1 or more.
- the material for the insulator particles having high thermal conductivity include materials having strong covalent bonds such as silica and diamond.
- the high thermal conductive grease is a silicone oil mixture containing particles such as silica
- the high thermal conductive paste is a thermosetting resin containing particles such as Ag.
- the adhesive layer 14 only needs to be formed in at least a part of the region between the outer peripheral portion of the phosphor layer 15 and the side wall 13, but the heat radiation path from the phosphor layer 15 is enlarged to dissipate heat from the phosphor layer 15. In order to improve the property, it is preferable to form in all the regions in contact with the metal layer 13a. However, the adhesive layer 14 does not electrically connect a plurality of separated regions of the metal layer 13a. This is to prevent the circuit of the LED element 12 from being short-circuited by the metal layer 13 a and the adhesive layer 14.
- the phosphor layer 15 is made of single crystal phosphor, ceramic phosphor, or glass containing phosphor particles.
- the single crystal phosphor for example, a garnet single crystal phosphor represented by YAG: Ce (YttriumtAluminum Garnet) disclosed in International Publication No. 2012/057330 can be used.
- the ceramic phosphor for example, a garnet-based ceramic phosphor represented by YAG: Ce can be used.
- the glass containing the phosphor particles for example, a low melting point glass can be used.
- Single crystal phosphors, ceramic phosphors, and glass containing phosphor particles have higher thermal conductivity than transparent resins containing phosphor particles, so that the heat generated in the phosphor layer 15, particularly the temperature rise, is increased.
- the heat of the central part can be efficiently transmitted to the outer peripheral part, and the heat can be efficiently discharged to the heat radiating member via the adhesive layer 14 and the side wall 13 having high thermal conductivity. As a result, since temperature rise of the phosphor layer can be suppressed, temperature quenching hardly occurs.
- the thermal conductivity of a silicone resin which is one of the transparent resins, is about 0.1 W / (m ⁇ K), whereas the YAG: Ce single crystal phosphor or the YAG: Ce ceramic phosphor
- the thermal conductivity is about 10W / (m ⁇ K)
- the thermal conductivity of low-melting glass is about 1W / (m ⁇ K), which is 10 to 100 times higher than the conventional resin structure. Due to the capability, heat can be efficiently transferred to the outer peripheral portion of the phosphor layer 15.
- the phosphor layer 15 has the light emission wavelength of the LED element 12 and the phosphor layer so that the light of the LED element 12 and the fluorescence whose wavelength is converted in the phosphor layer 15 can be efficiently extracted to the outside. It is desirable to have a transmittance of about 80% or more for 15 fluorescence wavelengths.
- the single crystal phosphor produced by melt growth has a lower temperature quenching than phosphor particles produced by conventional sintering. For this reason, a single crystal phosphor is particularly preferable as the material of the phosphor layer 15.
- the heat generated in the phosphor layer 15 having high thermal conductivity is efficiently transmitted to the outer peripheral portion of the phosphor layer 15 and is transmitted through the adhesive layer 14, the metal layer 13 a, and the metal pad 11 having high thermal conductivity. It is efficiently discharged from the metal pad 11 or a heat radiating member (not shown) connected to the metal pad 11. For this reason, the heat
- the area of the denominator of the light emission density is the area of the phosphor layer 15 contributing to wavelength conversion, that is, the area of the lower surface of the phosphor layer 15 exposed to the LED element 12 side.
- the thickness of the phosphor layer 15 is, for example, 1 mm.
- the heat generated in the phosphor layer 15 by the means of the present embodiment is effectively reduced. It becomes important to discharge.
- the second embodiment differs from the first embodiment in the configuration of the side walls. Note that the description of the same points as in the first embodiment will be omitted or simplified.
- FIG. 2 is a vertical cross-sectional view of the light emitting device according to the second embodiment.
- the light emitting device 20 is fixed to the side wall 23 via the metal pad 11, the LED element 12 mounted on the metal pad 11, the side wall 23 surrounding the LED element 12, and the adhesive layer 14, and above the LED element 12.
- a phosphor layer 15 that is positioned.
- the side wall 23 is made of a ceramic such as Al 2 O 3 , AlN, Si 3 N 4 , or BN having a higher thermal conductivity than the resin material.
- the thermal conductivities of Al 2 O 3 , AlN, Si 3 N 4 , and BN are about 30 W / (m ⁇ K), about 170 W / (m ⁇ K), about 90 W / (m ⁇ K), and about 60 W / ( m ⁇ K).
- the side wall 23 is a part of the package of the light emitting device 20, for example.
- the heat generated in the phosphor layer 15 is transmitted through the adhesive layer 14 and the side wall 23 having high thermal conductivity, and is also discharged from the side wall 23.
- the side wall 23 can directly receive and discharge the heat of the phosphor layer 15.
- heat is also discharged from the metal pad 11 or a heat radiating member (not shown) connected to the metal pad 11. For this reason, the heat
- FIG. 3A and FIG. 3B are vertical sectional views of a modification of the light emitting device according to the second embodiment.
- the side wall 23 of the light emitting device 20a in FIG. 3A and the light emitting device 20b in FIG. 3B is made of metal.
- 3A includes a metal plate 21, an insulating substrate 22 installed on the metal plate 21, an LED element 12 installed on the insulating substrate 22, a side wall 23 surrounding the LED element 12, and an adhesive layer. 14, a phosphor layer 15 that is fixed to the side wall 23 via 14 and located above the LED element 12, and a heat radiating member 27 such as a heat sink that contacts the bottom surface of the side wall 23.
- the insulating substrate 22 is fixed on the metal plate 21 by an adhesive layer 25.
- the insulating substrate 22 is made of an insulating material having a high thermal conductivity such as AlN.
- the adhesive layer 25 is made of, for example, SnAgCu solder, AuSn solder, or the like.
- a wiring pattern 24 made of a metal such as Ag or Au is formed on the upper surface of the insulating substrate 22.
- the LED element 12 is connected to the wiring pattern 24 via a wire 16 and an electrode (not shown) formed on the bottom surface of the crystal layer 12a.
- the LED element 12 and the metal plate 21 are insulated by an insulating substrate 22.
- the wiring pattern 24 is connected to a wire (not shown) covered with an insulating film extending from the outside to the inside of the light emitting device 20a through a groove or hole provided in the side wall 23, and the LED is connected through the wire. Power is supplied to the element 12.
- the metal plate 21 is made of a metal having high thermal conductivity such as Cu.
- the metal plate 21 is fixed to the heat dissipation member 27 with screws 29, for example.
- High heat conductive grease 26 is applied between the metal plate 21 and the heat radiating member 27. Further, a heat radiating sheet may be used in place of the high thermal conductive grease 26. Furthermore, instead of the high thermal conductive grease 26, a high thermal conductive paste or solder can be used. If the connection strength between the metal plate 21 and the heat radiating member 27 is sufficient, the screw 29 may not be used.
- This high thermal conductive paste is, for example, a thermosetting resin containing metal particles such as Ag and metal nanoparticles.
- the side wall 23 is made of a metal such as Ag or Al. Further, for example, Ag with high reflectivity may be formed on the surface of Cu. The side wall 23 does not contact the wiring pattern 24 to prevent a short circuit.
- the side wall 23 contacts the heat radiating member 27 and the adhesive layer 14, and can transmit heat generated in the phosphor layer 15 and transmitted to the adhesive layer 14 to the heat radiating member 27.
- the heat of the phosphor layer 15 can be directly received and transmitted to the heat radiating member 27.
- the side wall 23 is fixed to the heat radiating member 27 with screws 28.
- the metal plate 21 and the high thermal conductivity grease 26 have a thermal conductivity of 1 W / m ⁇ K or more, and thus can be regarded as a part of the heat dissipation member. That is, the metal plate 21, the high thermal conductive grease 26, and the heat radiating member 27 constitute one heat radiating member.
- FIG. 4A and FIG. 4B are vertical sectional views of modifications of the light emitting device according to the second embodiment.
- the side wall 23 of the light emitting device 20c in FIG. 4A and the light emitting device 20d in FIG. 4B is made of metal.
- 4A includes a metal plate 21, an insulating substrate 22 installed on the metal plate 21, an LED element 12 installed on the insulating substrate 22, a side wall 23 surrounding the LED element 12, and an adhesive layer. 14, the phosphor layer 15 positioned above the LED element 12, a heat radiation member 27 such as a heat sink, and a heat radiation member 82 provided outside the side wall 23.
- a housing 81 shown in FIG. 4A is a part of a housing of a lighting fixture having the light emitting device 20c.
- the heat dissipating member 27 is fixed to the casing 81 by, for example, screw fixing using an L-shaped metal fitting (not shown) or an epoxy adhesive.
- the heat radiating member 27 of the light emitting device 20 c is mainly used for releasing heat generated in the LED element 12.
- the side wall 23 is fixed to the housing 81 with screws 28, for example.
- the side wall 23 may be fixed to the casing 81 using an epoxy adhesive or the like instead of the screw 28.
- the side wall 23 and the heat dissipation member 82 of the light emitting device 20c are made of metal or ceramic.
- the heat radiating member 82 is, for example, a member formed integrally with the side wall 23 from the same material as the side wall 23. That is, the outer side of the wide side wall that is the side wall 23 is used as the heat dissipation member 82.
- the heat radiating member 82 may be formed independently from a material different from that of the side wall 23.
- the heat dissipation member 82 is connected to the side wall 23 via an adhesive member.
- the adhesive member is made of a material such as a resin containing solder such as a high thermal conductive grease or a high thermal conductive paste having a high thermal conductivity, for example, 1 W / (m ⁇ K) or more, or a material such as solder.
- the heat dissipation member 82 may have a structure in which the surface is finned.
- the side wall 23 is in contact with the heat radiating member 82 and the adhesive layer 14, and can transmit the heat generated in the phosphor layer 15 and transmitted to the adhesive layer 14 to the heat radiating member 82. Further, when a part of the side wall 23 is in direct contact with the phosphor layer 15, the heat of the phosphor layer 15 can be directly received and transmitted to the heat radiating member 82.
- the heat radiating member 83 is a reflector that opens above the LED element 12 for reflecting the light emitted from the LED element 12 and transmitted through the phosphor layer 15, and is fixed to the side wall 23.
- the heat dissipation member 83 is made of metal or ceramic.
- the heat radiating member 83 is fixed on the upper surface of the side wall 23 by screws 28 through, for example, high thermal conductive grease or TIM (Thermal Interface Material). Further, the heat radiating member 83 may be formed integrally with the side wall 23 from the same material as the side wall 23. Further, the side wall 23 may have a structure in which the surface is finned in the same manner as the heat dissipation member 27.
- the phosphor layer 15 may be affected by the heat generated by the LED element 12.
- the heat dissipating member 27 and the heat dissipating member 83 are thermally separated, so that the heat dissipating path from the LED element 12 and the heat dissipating path from the phosphor layer 15 are thermally separated. Has been. For this reason, the temperature rise of the fluorescent substance layer 15 can be suppressed more effectively.
- the heat radiating member 82 of the light emitting device 20c or the heat radiating member 83 of the light emitting device 20d may be applied to the light emitting device 20. Moreover, you may apply to the light-emitting device 10 of 1st Embodiment.
- the base 13b of the side wall 13 is required to be made of ceramic such as Al 2 O 3 , AlN, Si 3 N 4 , or BN having high thermal conductivity, and the heat radiating member 82 or the heat radiating member 83 is formed on the side wall 13. It is formed integrally with the base body 13 b or connected to the base body 13 b on the side wall 13.
- the third embodiment differs from the first embodiment in the configuration of the phosphor layer. Note that the description of the same points as in the first embodiment will be omitted or simplified.
- FIG. 5 is a partially enlarged vertical sectional view of the light emitting device according to the third embodiment.
- the light emitting device 30 includes a metal pad 11, an LED element 12 mounted on the metal pad 11, a side wall 13 having a metal layer 13 a on the side surface on the LED element 12 side surrounding the LED element 12, and an adhesive layer 14.
- a phosphor layer 35 that is fixed to the metal layer 13 a of the side wall 13, has a metal film 35 a in a portion in contact with the adhesive layer 14 on the surface, and is positioned above the LED element 12. Except for the phosphor layer, the configuration of the light-emitting device 30 is the same as that of the light-emitting device 10 of the first embodiment.
- the fluorescent part 35b of the phosphor layer 35 is made of the same material as the phosphor layer 15 of the first embodiment and has the same shape.
- the metal film 35a of the phosphor layer 35 is made of a metal such as Au, Ag, Pd, Pt, Sn, Ni, Cr, Fe or an alloy containing them. In particular, Ag having a high reflectance or an alloy containing Ag is suitable.
- the metal film 35a is formed by sputtering or vapor deposition, for example.
- the metal film 35a is provided on the phosphor layer 35, and the adhesive layer 14 is adhered to the metal film 35a. Since the solder has high thermal conductivity (for example, about 60 W / (m ⁇ K) with Sn3Ag0.5Cu solder), it is preferable for the heat radiation of the phosphor layer 35 that the adhesive layer 14 is made of solder.
- the metal film 35a only needs to be formed on at least a part of the outer peripheral portion of the fluorescent portion 35b that is in contact with the adhesive layer 14, but the outer peripheral portion of the fluorescent portion 35b has an adhesive layer 14 in order to increase thermal conductivity. It is preferable to be formed in all the parts that come into contact with.
- the heat generated in the fluorescent part 35b of the phosphor layer 35 is transmitted through the metal film 35a, the adhesive layer 14, the metal layer 13a, and the metal pad 11 having high thermal conductivity, and is mainly connected to the metal pad 11 or the metal pad 11. It is emitted from a heat radiating member (not shown). For this reason, the heat
- this embodiment may be combined with the second embodiment. That is, the side wall 23 of the second embodiment may be used instead of the side wall 13. In this case, the heat generated in the fluorescent part 35b is transmitted through the metal film 35a, the adhesive layer 14, and the side wall 23 and is released from the heat radiating members 27a, 27b, or 27c.
- the fourth embodiment is different from the first embodiment in the configuration of the phosphor layer. Note that the description of the same points as in the first embodiment will be omitted or simplified.
- FIG. 6A is a partially enlarged vertical sectional view of the light emitting device according to the fourth embodiment.
- the light emitting device 40 includes a metal pad 11, an LED element 12 mounted on the metal pad 11, a side wall 13 having a metal layer 13 a on the side surface on the LED element 12 side surrounding the LED element 12, and an adhesive layer 14.
- a phosphor layer 45 that is fixed to the metal layer 13 a of the side wall 13, has a concavo-convex portion 45 a in a portion that contacts the adhesive layer 14 on the surface on the LED element 12 side, and is positioned above the LED element 12.
- the configuration of the light emitting device 40 is the same as that of the light emitting device 10 of the first embodiment.
- FIG. 6B is a partially enlarged perspective view of the phosphor layer according to the fourth embodiment.
- the phosphor layer 45 is made of the same material as that of the phosphor layer 15 of the first embodiment, and is uneven on a portion in contact with the adhesive layer 14 on the LED element 12 side surface (the lower surface in FIG. 6A). Part 45a.
- the contact area between the adhesive layer 14 and the phosphor layer 45 increases, and the heat of the phosphor layer 45 is transferred to the adhesive layer 14. You can escape efficiently.
- the uneven portion 45a has a depth of 10% or more of the thickness of the phosphor layer (the depth from the top of the convex portion to the bottom of the concave portion).
- the concavo-convex portion 45a is formed, for example, by etching the phosphor layer 45.
- the concavo-convex portion 45a only needs to be formed on at least a part of the portion of the phosphor layer 45 that contacts the adhesive layer 14 on the surface of the LED element 12, but in order to improve the heat dissipation of the phosphor layer 45, It is preferable that the phosphor layer 45 is formed on all portions in contact with the adhesive layer 14 on the surface of the LED element 12 side.
- the heat generated in the phosphor layer 45 is transmitted through the adhesive layer 14, the metal layer 13 a, and the metal pad 11 having high thermal conductivity, and is mainly emitted from the metal pad 11 or a heat dissipation member (not shown) connected to the metal pad 11. .
- fever of the fluorescent substance layer 45 can be discharge
- this embodiment may be combined with the second embodiment. That is, the side wall 23 of the second embodiment may be used instead of the side wall 13. In this case, the heat generated in the phosphor layer 45 is transmitted through the adhesive layer 14 and the side wall 23 and is released from the heat radiating members 27a, 27b, or 27c.
- the fifth embodiment differs from the first embodiment in the configuration of the phosphor layer. Note that the description of the same points as in the first embodiment will be omitted or simplified.
- FIG. 7 is a vertical sectional view of the light emitting device according to the fifth embodiment.
- the light emitting device 50 is fixed to the side wall 13 via the metal pad 11, the LED element 12 mounted on the metal pad 11, the side wall 13 surrounding the LED element 12, and the adhesive layer 14, and above the LED element 12. And a phosphor layer 51 positioned.
- the phosphor layer 51 includes a transparent substrate 51a and a resin layer 51b containing phosphor particles on the surface of the transparent substrate 51a.
- the phosphor layer 51 may be formed on either the upper surface or the lower surface of the transparent substrate 51a.
- the transparent substrate 51a is a transparent substrate having a high thermal conductivity, for example, 1 W / (m ⁇ K) or more.
- the thermal conductivity of the transparent substrate 51a is preferably 10 W / (m ⁇ K) or more, and more preferably 30 W / (m ⁇ K) or more.
- the base material of the transparent substrate 51a is, for example, glass, gallium oxide (Ga 2 O 3 ), zinc oxide (ZnO), sapphire, silicon carbide (SiC), or diamond, and each thermal conductivity is 1 W / ( m ⁇ K), 10 W / (m ⁇ K), 25 W / (m ⁇ K), 33 W / (m ⁇ K), 350 W / (m ⁇ K), and 2000 W / (m ⁇ K).
- the heat generated in the phosphor particles is transferred to the transparent substrate 51a through the resin containing the phosphor particles.
- the thermal conductivity of the transparent substrate 51a is higher than that of the phosphor layer 15 of the first embodiment that can be considered that the phosphor is integrated with the phosphor base material.
- the transparent substrate 51a preferably has a transmittance of 80% or more for the emission wavelength of the LED element 12 and the fluorescence wavelength of the phosphor particles contained in the resin layer 51b.
- the resin of the resin layer 51b is a transparent resin such as a silicone resin.
- the phosphor particles contained in the resin layer 51b are, for example, YAG: Ce phosphor particles.
- the phosphor particles contained in the resin layer 51b are preferably single crystal powder phosphors produced by pulverizing a single crystal phosphor produced by melt growth.
- the single crystal phosphor produced by melt growth has a small temperature quenching, and the single crystal powder formed from the single crystal phosphor produced by melt growth obtained by pulverizing it.
- the phosphor has a lower temperature quenching than the polycrystalline powder phosphor produced by conventional sintering.
- a single crystal powder phosphor produced by pulverizing a single crystal phosphor produced by melt growth is particularly preferred as the phosphor particles contained in the resin layer 51b.
- the resin layer 51b After mixing the phosphor particles in the resin, this is applied to the upper surface of the transparent substrate 51a, and subjected to heat treatment to solidify the resin, whereby the resin layer 51b is obtained.
- the adhesive layer 14 is made of solder or silver paste
- the transparent substrate 51a is fixed to the side wall 13 by the adhesive layer 14, and then heat treatment is performed to solidify the resin of the resin layer 51b.
- the adhesive layer 14 is made of high thermal conductive grease, it is preferable to fix the transparent substrate 51a to the side wall 13 by the adhesive layer 14 after performing a heat treatment for solidifying the resin of the resin layer 51b.
- the heat generated in the phosphor layer 51 is transmitted through the adhesive layer 14, the metal layer 13 a, and the metal pad 11 having high thermal conductivity, and is released mainly from the metal pad 11 or a heat dissipation member (not shown) connected to the metal pad 11. .
- fever of the fluorescent substance layer 51 can be discharge
- the phosphor layer 51 may be replaced with the phosphor layer 15 of the light emitting devices 20, 20 a, 20 b, 20 c, and 20 d, the phosphor layer 35 of the light emitting device 30, or the phosphor layer 45 of the light emitting device 40.
- a metal film similar to the metal film 35a is provided in a portion in contact with the adhesive layer 14 on the outer peripheral portion of the transparent substrate 51a.
- an uneven portion similar to the uneven portion 45a is provided in a portion in contact with the adhesive layer 14 on the surface of the transparent substrate 51a on the LED element 12 side.
- the sixth embodiment is different from the second embodiment in that the phosphor layer is directly connected to the heat dissipation member. Note that the description of the same points as in the second embodiment will be omitted or simplified.
- the light emitting devices 60a, 60b, and 60c are respectively a metal plate 21, an insulating substrate 22 installed on the metal plate 21, an LED element 12 installed on the insulating substrate 22, a heat dissipation member 27 such as a heat sink, A phosphor layer 65 that covers the upper side and the side of the LED element 12 and is directly connected to the heat radiating member 27.
- the insulating substrate 22 is fixed on the metal plate 21 by an adhesive layer 25.
- a wiring pattern 24 made of a metal such as Ag or Au is formed on the upper surface of the insulating substrate 22.
- the LED element 12 is connected to the wiring pattern 24 via a wire 16 and an electrode (not shown) formed on the bottom surface of the crystal layer 12a.
- the metal plate 21 is fixed to the heat dissipation member 27 with screws 29, for example. High heat conductive grease 26 is applied between the metal plate 21 and the heat radiating member 27.
- the phosphor layer 65 has a dome shape, for example, and is made of a single crystal phosphor, a ceramic phosphor, glass containing phosphor particles, or a transparent resin containing phosphor particles.
- the phosphor layer 65 may have the same configuration as the phosphor layer 51 of the fifth embodiment.
- the heat generated in the phosphor layer 65 is directly transmitted to the heat radiating member 27 and is released from the heat radiating member 27.
- the lower part of the phosphor layer 65 is fitted in a circular groove 61 formed so as to surround the metal plate 21 on the upper surface of the heat radiating member 27, and the phosphor layer 65 is attached to the heat radiating member 27. Fixed to.
- the fluorescent substance layer 65 has the structure similar to the fluorescent substance layer 51 of 5th Embodiment, specifically, the lower part of the transparent substrate 51a is engage
- a screw groove 62 is formed on the inner side surface of the groove 61, and a screw groove 63 corresponding to the screw groove 62 is formed on the inner side surface of the lower portion of the phosphor layer 65.
- the phosphor layer 65 is fixed to the heat dissipation member 27 by screwing the lower portion of the phosphor layer 65 into the groove 61 of the heat dissipation member 27.
- the screw groove 62 may be formed on the outer side surface of the groove 61, and the screw groove 63 may be formed on the outer side surface of the lower portion of the phosphor layer 65.
- a screw groove 63 is formed on the side surface of the lower portion of the transparent substrate 51a.
- a screw groove 64 is formed on the upper side surface of the heat radiating member 27, and a screw groove 63 corresponding to the screw groove 64 is formed on the inner side surface of the lower portion of the phosphor layer 65.
- the phosphor layer 65 is fixed to the heat dissipation member 27 by screwing the lower portion of the phosphor layer 65 into the groove 61 of the heat dissipation member 27.
- a screw groove 63 is formed on the inner side surface of the lower portion of the transparent substrate 51a.
- the heat radiation path is provided to efficiently release the heat of the phosphor layer, thereby reducing the emission intensity of the light emitting device due to the temperature quenching of the phosphor and the light emission. Color change can be suppressed.
- the phosphor layer is made of glass containing a single crystal phosphor, a ceramic phosphor, or phosphor particles, and the phosphor layer itself has a high thermal conductivity, heat can be radiated more efficiently.
- FIG. 10 is a vertical sectional view of the light emitting device according to the example.
- the light emitting device 70 shown in FIG. 10 was used to examine the influence of the structure of the phosphor layer and the material of the adhesive layer on the temperature of the phosphor layer.
- the light emitting device 70 surrounds the metal plate 21, the insulating substrate 22 installed on the metal plate 21, the LED element 72 installed on the insulating substrate 22, and the LED element 72. And a phosphor layer 71 which is fixed directly to the side wall 23 via the adhesive layer 14 and located above the LED element 12.
- the adhesive layer 14 is made of high thermal conductive grease having a thermal conductivity of 3 W / (m ⁇ K).
- the insulating substrate 22 is fixed on the metal plate 21 by an adhesive layer 25 made of SuAgCu solder.
- the insulating substrate 22 is made of AlN and has a thickness of 0.38 mm.
- the planar shape of the insulating substrate 22 is a square of 20 mm ⁇ 20 mm.
- the LED element 72 is a flip chip type LED element and is connected to the wiring pattern 24 on the insulating substrate 22.
- the planar shape of the LED elements 72 is a square of 1 mm ⁇ 1 mm, and a total of 64 LED elements 72 in 8 rows and 8 columns are installed on the insulating substrate 22.
- the metal plate 21 is made of Cu and has a thickness of 3.5 mm.
- the planar shape of the metal plate 21 is a square of 40 mm ⁇ 40 mm.
- High heat conductive grease 26 is applied between the metal plate 21 and the heat radiating member 27.
- the metal plate 21 and the high thermal conductivity grease 26 have a thermal conductivity of 1 W / m ⁇ K or more, and thus can be regarded as a part of the heat dissipation member. That is, the metal plate 21, the high thermal conductive grease 26, and the heat radiating member 27 constitute one heat radiating member.
- the side wall 23 is made of Al.
- the side wall 23 has a circular opening. For this reason, the area
- the planar shape of the heat dissipation member 27 is a square of 100 mm ⁇ 100 mm.
- the planar shape of the phosphor layer 71 is a square of 22 mm ⁇ 22 mm, and the area exposed to the LED element 72 side on the lower surface, that is, the area contributing to wavelength conversion is a circle having a diameter of 19 mm. Accordingly, the area of the region contributing to wavelength conversion of the phosphor layer 71 is 2.8 [cm 2 ].
- the thickness of the phosphor layer 71 is 1 mm. The correlated color temperature during whitening of the light emitting device 70 was adjusted to 5000K.
- Table 1 shows the configurations of the seven light emitting devices (samples 1 to 7) used for the evaluation in this example, and the measured values of the temperature in the vicinity of the center of the phosphor layer 71 during light emission.
- Total radiant flux [W] in Table 1 is the total radiant flux of the LED element 72, and each sample was evaluated while changing this.
- the “light radiant flux density [W / cm 2 ]” is a radiant flux density of light emitted from the LED element 72 and incident on the phosphor layer 71, and “total radiant flux [W]” is defined as the phosphor layer. 71 divided by the area 2.8 [cm 2 ] of the region contributing to wavelength conversion.
- Phosphor layer temperature [° C.]” in Table 1 is a temperature near the center of the phosphor layer 71 during light emission, and “x” represents a temperature exceeding 150 ° C. Since the maximum junction temperature of the LED element 72 is about 120 to 150 ° C., 150 ° C. is one criterion.
- Table 1 shows that heat is most effectively discharged when the phosphor layer 71 is a single crystal phosphor plate, and that heat is most not discharged when the phosphor layer 71 is made of a phosphor-containing resin plate.
- the difference in heat dissipation characteristics between sample 2 and sample 4 is that the thermal conductivity of the sapphire substrate of sample 4 (33 W / (m ⁇ K)) is the thermal conductivity of the glass substrate of sample 2 (1 W / (m ⁇ K)). ). Also, in the samples 2 and 3 in which the phosphor layer 71 is a combination of a glass substrate and a resin containing a YAG sintered powder phosphor thereon, the light radiant flux density [W / cm 2 ] is 1.8 [W / Cm 2 ], the temperature could be kept near 100 ° C.
- the temperature of the phosphor layer 71 is obtained by providing the adhesive layer 14. It can be confirmed that can be greatly reduced. In addition, the same experiment as in this example confirmed that the temperature of the phosphor layer 71 can be reduced even when high thermal conductivity grease having a thermal conductivity of 1 W / (m ⁇ K) is used as the adhesive layer 14. . From these results, it can be said that the thermal conductivity of the adhesive layer 14 is 1 W / (m ⁇ K) or more, and preferably 3 W / (m ⁇ K) or more.
- the area of the lower surface of the phosphor layer 71 that is in contact with the adhesive layer 14 is 22 2 ⁇ (19/2) 2 cm 2 , and ⁇ (19 / 2)
- the ratio to 2 cm 2 is 70%.
- the experiment similar to the present example confirmed that the temperature of the phosphor layer 71 was reduced by the adhesive layer 14 when this ratio was 35% or more. From these results, it can be said that the ratio of the area in contact with the adhesive layer 14 on the lower surface of the phosphor layer 71 to the total area is 35% or more, and preferably 70% or more.
- the resin layer is made thin and the heat
- the mass percent concentration of the phosphor particles in the resin in Samples 2 to 5 is 57% by mass. Moreover, it was confirmed by the experiment similar to a present Example that the heat
- the light emitting device may include a plurality of heat dissipating members in any different form shown in the above embodiment. That is, the heat radiating member of the light emitting device may be composed of a plurality of members having arbitrary different forms.
- the constituent elements of the above-described embodiment can be arbitrarily combined without departing from the spirit of the invention.
- a light-emitting device using a remote phosphor that is suitable for lighting equipment that requires a large amount of light and high brightness such as a projector, and that has little decrease in light emission intensity or change in light emission color during use.
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Abstract
Description
(発光装置の構成)
図1Aは、第1の実施の形態に係る発光装置の上面図である。図1Bは、図1Aの線分A-Aで切断した発光装置の垂直断面図である。発光装置10は、リモート蛍光体を利用した発光装置である。ここで、リモート蛍光体とは、発光装置内において蛍光体層と発光素子とを離して設置する技術である。
第2の実施の形態は、側壁の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図2は、第2の実施の形態に係る発光装置の垂直断面図である。発光装置20は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む側壁23と、接着層14を介して側壁23に固定され、LED素子12の上方に位置する蛍光体層15と、を有する。
第3の実施の形態は、蛍光体層の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図5は、第3の実施の形態に係る発光装置の部分的に拡大された垂直断面図である。発光装置30は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む、LED素子12側の側面に金属層13aを有する側壁13と、接着層14を介して側壁13の金属層13aに固定され、表面の接着層14と接触する部分に金属膜35aを有し、LED素子12の上方に位置する蛍光体層35と、を有する。蛍光体層を除いて、発光装置30の構成は第1の実施の形態の発光装置10と同様である。
第4の実施の形態は、蛍光体層の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図6Aは、第4の実施の形態に係る発光装置の部分的に拡大された垂直断面図である。発光装置40は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む、LED素子12側の側面に金属層13aを有する側壁13と、接着層14を介して側壁13の金属層13aに固定され、LED素子12側の面上の接着層14と接触する部分に凹凸部45aを有し、LED素子12の上方に位置する蛍光体層45と、を有する。蛍光体層を除いて、発光装置40の構成は第1の実施の形態の発光装置10と同様である。
第5の実施の形態は、蛍光体層の構成において、第1の実施の形態と異なる。なお、第1の実施の形態と同様の点については、説明を省略又は簡略化する。
図7は、第5の実施の形態に係る発光装置の垂直断面図である。発光装置50は、金属パッド11と、金属パッド11上に搭載されたLED素子12と、LED素子12を囲む側壁13と、接着層14を介して側壁13に固定され、LED素子12の上方に位置する蛍光体層51と、を有する。
第6の実施の形態は、蛍光体層が放熱部材に直接接続される点において、第2の実施の形態と異なる。なお、第2の実施の形態と同様の点については、説明を省略又は簡略化する。
図8A、図8B及び図9は、第6の実施の形態に係る発光装置の垂直断面図である。発光装置60a、60b、60cは、それぞれ、金属板21と、金属板21上に設置された絶縁基板22と、絶縁基板22上に設置されたLED素子12と、ヒートシンク等の放熱部材27と、LED素子12の上方及び側方を覆い、前記放熱部材27に直接接続される蛍光体層65と、を有する。
上記の第1~6の実施の形態によれば、放熱経路を設けて蛍光体層の熱を効率的に放出することにより、蛍光体の温度消光に起因する発光装置の発光強度の低下や発光色の変化を抑制することができる。また、蛍光体層が単結晶蛍光体、セラミック蛍光体、又は蛍光体粒子を含むガラスからなり、蛍光体層自体の熱伝導率が高い場合には、より効率よく放熱することができる。
Claims (20)
- 480nm以下のピーク波長を有する光を発する発光素子と、
前記発光素子の発する光の波長を変換可能な蛍光体層と、
前記蛍光体層で発生した熱を排出する放熱部材と、
を有し、
前記蛍光体層は、単結晶蛍光体、セラミック蛍光体、蛍光体粒子を含むガラスからなる層、又は透明基板とその表面上に形成された蛍光体粒子を含む樹脂層とを含む層であり、
前記蛍光体層は、前記発光素子の上方及び側方を覆う、前記放熱部材に直接接続される層、又は、前記発光素子の上方を覆う、前記発光素子を囲む側壁に接着層を介して接続される層であり、
前記側壁は、第1の側壁又は第2の側壁であり、
前記第1の側壁は、前記LED素子を囲む絶縁性の基体と、前記基体の前記LED素子側の側面に形成された金属層を有し、前記金属層は前記放熱部材及び前記接着層に接触し、
前記第2の側壁は、前記放熱部材及び前記接着層に接触するセラミック又は金属からなり、
前記接着層は、粒子を含有する樹脂からなり、前記粒子の熱伝導率が前記樹脂の熱伝導率よりも高い樹脂層、又は半田からなる層である、
発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記放熱部材は、前記発光素子が電気的に接続される金属パッドを含み、
前記側壁は、前記第1の側壁、又はセラミックからなる前記第2の側壁である、
請求項1に記載の発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記側壁は、金属からなる前記第2の側壁であり、
前記発光素子は、前記放熱部材と絶縁されている、
請求項1に記載の発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記放熱部材は、前記第1の側壁のセラミックからなる前記基体と同一の材料から前記第1の側壁の前記基体と一体に形成された部材、又は前記第2の側壁と同一の材料から前記第2の側壁と一体に形成された部材を含む、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記放熱部材は、前記第1の側壁のセラミックからなる前記基体、又は前記第2の側壁に接触し、前記発光素子の上方に開口するリフレクターを含む、
請求項1~3のいずれか1項に記載の発光装置。 - 前記放熱部材は、前記発光素子の下方に位置するヒートシンクを含む、
請求項1~3のいずれか1項に記載の発光装置。 - 前記発光素子の熱を排出するための発光素子用放熱部材をさらに有し、
前記放熱部材と前記発光素子用放熱部材とが熱的に分離されている、
請求項1~3のいずれか1項に記載の発光装置。 - 前記透明基板の母材は、ガラス、酸化ガリウム、酸化亜鉛、サファイア、シリコンカーバイド、又はダイヤモンドである、
請求項1~3のいずれか1項に記載の発光装置。 - 前記透明基板は、熱伝導率が1W/(m・K)以上であり、前記発光素子の発光波長、及び蛍光波長に対する透過率が80%以上である、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体粒子は、単結晶蛍光体の粒子である、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記蛍光体層は、表面の前記接着層と接触する部分に金属膜を有し、
前記接着層は半田からなる、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記蛍光体層は、前記発光素子側の面上の前記接着層と接触する部分に前記蛍光体層の厚さの10%以上の深さの凹凸を有する、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記側壁は、前記放熱部材にビスにより固定されている、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体層は、前記側壁に前記接着層を介して接続される層であり、
前記接着層の熱伝導率は3W/(m・K)以上である、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体層は、前記放熱部材に直接接続される層であり、
前記放熱部材の上面に形成された溝に前記蛍光体層の下部が嵌め込まれた構造、前記放熱部材の上面の溝の側面に形成されたネジ溝と前記蛍光体層の下部の側面に形成されたネジ溝によりネジ固定される構造、又は前記放熱部材の側面の上部に形成されたネジ溝と前記蛍光体層の下部の内側の側面に形成されたネジ溝によりネジ固定される構造を有する、
請求項1に記載の発光装置。 - 前記発光素子から発せられて前記蛍光体層に入射する光の放射束密度が1.8W/cm2以上である、
請求項1~3のいずれか1項に記載の発光装置。 - 前記蛍光体層の下面の前記接着層に接触している面積の波長変換に寄与する領域の面積に対する割合は35%以上である、
請求項1~3のいずれか1項に記載の発光装置。 - 前記割合は70%以上である、
請求項17に記載の発光装置。 - 前記蛍光体層は、透明基板とその表面上に形成された蛍光体粒子を含む樹脂層とを含む層であり、
前記樹脂層中の前記蛍光体粒子の質量パーセント濃度が50質量%以上である、
請求項1~3のいずれか1項に記載の発光装置。 - 前記質量パーセント濃度が57質量%以上である、請求項19に記載の発光装置。
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US11843078B2 (en) | 2019-12-26 | 2023-12-12 | Nichia Corporation | Light emitting device with good visibility |
JP7518335B2 (ja) | 2020-02-28 | 2024-07-18 | 日亜化学工業株式会社 | 波長変換部材及び発光装置 |
US11920068B2 (en) | 2020-07-13 | 2024-03-05 | Nichia Corporation | Method of manufacturing wavelength conversion member and wavelength conversion member |
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US9634216B2 (en) | 2017-04-25 |
JP2020010063A (ja) | 2020-01-16 |
US20170186923A1 (en) | 2017-06-29 |
JP6604543B2 (ja) | 2019-11-13 |
JPWO2015020205A1 (ja) | 2017-03-02 |
US20160190418A1 (en) | 2016-06-30 |
EP3032594A1 (en) | 2016-06-15 |
US10340429B2 (en) | 2019-07-02 |
CN105684170A (zh) | 2016-06-15 |
CN105684170B (zh) | 2019-09-03 |
EP3032594A4 (en) | 2017-01-25 |
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