CN105278225A - Wavelength conversion device, manufacture method thereof, correlative light-emitting device, and projection system - Google Patents
Wavelength conversion device, manufacture method thereof, correlative light-emitting device, and projection system Download PDFInfo
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- CN105278225A CN105278225A CN201410348434.0A CN201410348434A CN105278225A CN 105278225 A CN105278225 A CN 105278225A CN 201410348434 A CN201410348434 A CN 201410348434A CN 105278225 A CN105278225 A CN 105278225A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C14/00—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix
- C03C14/006—Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0294—Diffusing elements; Afocal elements characterized by the use adapted to provide an additional optical effect, e.g. anti-reflection or filter
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Abstract
The invention discloses a wavelength conversion device, a manufacture method thereof, a correlative light-emitting device, and a projection system. The wavelength conversion device comprises a light-emitting layer, a diffuse reflection layer, and a ceramic substrate which are successively stacked. The light-emitting layer comprises fluorescent powder and first glass powder. The volume fraction of the fluorescent powder to the light-emitting layer is from 14.1 to 38.7 percent. The diffuse reflection layer comprises white scattering particles and the first glass powder. The volume fraction of the white scattering particles to the diffuse reflection layer is from 22.0 to 62.9 percent. The coefficient of linear expansion of the ceramic substrate is greater than that of the first glass powder but less than those of the ceramic substrate and the white scattering particles. By adjustment of the volume fraction of the fluorescent powder in the light-emitting layer and the volume fraction of the white scattering particles in the diffuse reflection layer, the light-emitting layer and the diffuse reflection layer have high enough light-emitting efficiency and reflectivity and low internal thermal resistance and interface thermal resistance so as to achieve a beneficial effect of obtaining emergent light with high light-emitting efficiency.
Description
Technical field
The present invention relates to display and lighting field, particularly a kind of Wavelength converter and preparation method thereof, related lighting fixtures and projection arrangement.
Background technology
Along with the development of display and lighting technology, original LED or halogen bulb more and more can not meet the demand of display and lighting high power and high brightness as light source.The exciting light adopting solid state light emitter to send as LD (LaserDiode, laser diode) can obtain the visible ray of shades of colour with the method for excitation wavelength transition material, this technology is more and more applied in illumination and display.This technology has the advantage that efficiency is high, less energy consumption, cost are low, the life-span is long, is the desirable replacement scheme of existing white light or monochromatic light light source.
The light source of laser excitation wavelength transition material of the prior art, in order to improve light utilization efficiency, many employings are reflective---and light is incident in reflecting plate (i.e. reflection horizon and substrate) after phosphor sheet (i.e. luminescent layer), then phosphor sheet is reflected back toward, to guarantee light outgoing in the same direction, avoid the light loss caused because of the scattering process of phosphor sheet.But along with the progressively raising of excitation light power and power density thereof, the resistance to elevated temperatures of Wavelength converter (comprising reflector layer and reflection horizon) is more and more difficult to the demand meeting people.On the one hand, the metallic reflective coating as reflection horizon is at high temperature easily oxidized, and causes its reflectivity to decline; On the other hand, can only long-term work at 200 DEG C for the silica gel encapsulating fluorescent powder, when temperature rises to 250 DEG C, silica gel will very fast deterioration, causes its transmittance to decline.
For reflection horizon, for preventing metallic reflector to be at high temperature oxidized, more existing researcher attempts some stable inorganic scattering materials preparations to become reflection horizon, and this inorganic scattering material can withstand higher temperatures and chemical reaction does not occur.And for the silica gel for bonding fluorescent powder and inorganic scattering material, have researcher to propose and utilize glass material to substitute, this glass material has good transmittance, and softening point temperature is higher simultaneously.
But, find in actual applications, this using inorganic scattering material as reflection horizon, using glass material as the Wavelength converter of the bonding agent of fluorescent powder and inorganic scattering material, although can keep stable under high power laser light irradiates, its weak heat-dissipating, luminescence efficiency are low.
Summary of the invention
For above-mentioned technical matters, the invention provides a kind of Wavelength converter, content and the linear expansion coefficient of each component of this Wavelength converter meet certain relation, can meet the emergent light under power light source is irradiated with stable high-luminous-efficiency.
The invention provides a kind of Wavelength converter, comprising: luminescent layer stacked successively, diffuse reflector and ceramic substrate; Luminescent layer comprises fluorescent powder and the first glass dust, and wherein, the volume fraction that fluorescent powder accounts for luminescent layer is 14.1% ~ 38.7%; Diffuse reflector comprises white scattering particles and the first glass dust, and wherein, the volume fraction that white scattering particles accounts for diffuse reflector is 22.0% ~ 62.9%; The linear expansion coefficient of ceramic substrate is greater than the linear expansion coefficient of the first glass dust; The linear expansion coefficient of ceramic substrate is less than the linear expansion coefficient of fluorescent powder; The linear expansion coefficient of ceramic substrate is less than the linear expansion coefficient of white scattering particles.
Preferably, fluorescent powder accounts for the volume fraction of luminescent layer is 29.1% ~ 38.7%.
Preferably, the linear expansion coefficient of ceramic substrate is 4.0 × 10
-6/ K ~ 6.0 × 10
-6/ K, the coefficient of heat conductivity of ceramic substrate is more than or equal to 80W/mK.
Preferably, ceramic substrate is the one in aluminium nitride substrate, silicon carbide substrate.
Preferably, bonding interface layer is also comprised, between ceramic substrate and diffuse reflector.
Preferably, bonding interface layer is alumina layer.
Preferably, ceramic substrate is aluminium nitride substrate, and alumina layer is that the surface of aluminium nitride substrate obtains through oxidation processes.
Preferably, bonding interface layer is glass adhesive linkage, and this glass adhesive linkage comprises the first glass dust.
Preferably, bonding interface layer is silver-colored glass adhesive linkage, and this silver-colored glass adhesive linkage comprises silver, the second glass dust, and the fusing point of the second glass dust is lower than the first glass dust.
Preferably, the surface of ceramic substrate is the surface through corrosion treatment.
Preferably, the first glass dust is borosilicate glass, and the molar percentage of the boron oxide in this first glass dust is 10% ~ 19%, and the molar percentage of monox is 70% ~ 90%.
Preferably, the first glass dust is the combination of in silicate glass powder, borosilicate glass powder, boron phosphate glass powder, zinc phosphate glass powder at least two kinds.
Preferably, white scattering particles is the combination of one or more in aluminium oxide, magnesium oxide, boron nitride, yttria, zinc paste, titanium dioxide and zirconia.
Preferably, diffuse reflector is greater than 90% to visible light reflectance.
Preferably, the structural formula of fluorescent powder is (Y
1-aln
a)
3(Al
1-bga
b)
5o
12: Ce or (Ca
1-a-bsr
aba
b) AlSiN
3: Eu, wherein 0≤a≤1,0≤b≤1, Ln is lanthanide series.
Preferably, between luminescent layer and diffuse reflector be continuous transition layer.
The present invention also provides a kind of method preparing above-mentioned Wavelength converter, comprises the steps:
Step one: ceramic substrate is provided;
Step 2: by obtained for the mixing of white scattering particles, the first glass dust and organic carrier diffuse reflector slurry, diffuse reflector slurry is covered on the treated surface of ceramic substrate, obtained diffuse reflector raw cook, the volume fraction that white scattering particles accounts for the cumulative volume of white scattering particles and the first glass dust is 22.0% ~ 62.9%; The linear expansion coefficient of white scattering particles is greater than the linear expansion coefficient of ceramic substrate; The linear expansion coefficient of the first glass dust is less than the linear expansion coefficient of ceramic substrate;
Step 3: by obtained for the mixing of fluorescent powder, the first glass dust and organic carrier luminescent layer slurry, luminescent layer slurry is covered on diffuse reflector raw cook, obtained luminescent layer raw cook, the volume fraction that fluorescent powder accounts for the cumulative volume of fluorescent powder and the first glass dust is 14.1% ~ 38.7%; The linear expansion coefficient of fluorescent powder is greater than the linear expansion coefficient of ceramic substrate;
Step 4: luminescent layer raw cook, diffuse reflector raw cook and ceramic substrate are sintered jointly, obtained Wavelength converter.
Preferably, step one comprises: make oxidation processes to form oxide layer to ceramic base plate surface, or do corrosion treatment to ceramic base plate surface, or to ceramic base plate surface initial oxidation process corrosion treatment again, or process is reoxidized to the first corrosion treatment of ceramic base plate surface.
Present invention also offers a kind of light-emitting device, comprise excitation source, also comprise the Wavelength converter of above-mentioned any one.
Present invention also offers a kind of projection arrangement, comprise above-mentioned light-emitting device.
Compared with prior art, the present invention includes following beneficial effect:
In the present invention, be in certain suitable scope respectively by the volume fraction of white scattering particles in the volume fraction of fluorescent powder in regulation and control luminescent layer and diffuse reflector, the synergy of both realizations and mutual supplement with each other's advantages, luminescent layer and diffuse reflector is made to have sufficiently high luminescence efficiency and reflectivity respectively, simultaneously, because the consumption of the first glass dust in the present invention is enough by fluorescent powder and white scattering particles parcel, so luminescent layer and diffuse reflector inside have less porosity, thus internal thermal resistance reduces, on the other hand, linear expansion coefficient due to ceramic substrate is greater than the linear expansion coefficient of glass dust and is less than the linear expansion coefficient of fluorescent powder and white scattering particles, under the proportion of composing of luminescent layer of the present invention and diffuse reflector, the average coefficient of linear expansion of the linear expansion coefficient of ceramic substrate and luminescent layer and diffuse reflector is close, make when preparing and using Wavelength converter of the present invention, the material of the surface of contact both sides of ceramic substrate and diffuse reflector can not produce excessive relative displacement because expanding or shrink, thus ceramic substrate is combined with diffuse reflector firmly, there is less interface resistance.
In sum, technical scheme of the present invention meets certain relation by the content and linear expansion coefficient regulating and controlling each layer component in Wavelength converter, make that the luminescence efficiency of Wavelength converter is high, internal thermal resistance and interface resistance all reduce, thus reach the beneficial effect of the emergent light obtaining stable high-luminous-efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment one of Wavelength converter of the present invention;
Fig. 2 is the structural representation of the embodiment two of Wavelength converter of the present invention;
Fig. 3 is the structural representation of the embodiment three of Wavelength converter of the present invention.
Embodiment
Below in conjunction with drawings and embodiments, the embodiment of the present invention is described in detail.For being described clearly, hereafter described " on " upper and lower in the figure that all refers to of D score.
Embodiment one
Refer to Fig. 1, Fig. 1 is the structural representation of the embodiment one of Wavelength converter of the present invention.As shown in the figure, Wavelength converter 100 comprises luminescent layer 110, diffuse reflector 120 and ceramic substrate 130.Wherein luminescent layer 110 is for comprising the sintered body of fluorescent powder and the first glass dust, and diffuse reflector 120 is for comprising the sintered body of white scattering particles and the first glass dust.
After the exciting light that excitation source sends is incident in luminescent layer 110, excitated fluorescent powder sends Stimulated Light.Stimulated Light and unawakened exciting light are through after luminescent layer 110, be incident in diffuse reflector 120, then be reflected back toward luminescent layer 110, wherein Stimulated Light and the unawakened exciting light of part are through outgoing after luminescent layer 110, and the exciting light of remainder is converted into Stimulated Light by luminescent layer 110 exciting light.Total incident light of this Wavelength converter 100 is exciting light, and total emergent light is Stimulated Light and the unawakened exciting light of part.
When Wavelength converter 100 carries out light wavelength conversion, its heat produced mainly comprises: the heat that heat (diffuse reflector can not reach 100% reflectivity), exciting light and Stimulated Light that the heat that exciting light is converted into Stimulated Light and releases in luminescent layer 110, exciting light and Stimulated Light reflect and produce in diffuse reflector 120 are propagated and produced in luminescent layer 110 and diffuse reflector 120.And the heat propagation path of Wavelength converter 100, the first glass dust mainly from fluorescent powder to luminescent layer in 110, again to the first glass dust in diffuse reflector 120 and white scattering particles, then arrive ceramic substrate 130 by the first glass dust contacted with ceramic substrate 130 in diffuse reflector 120 and exhale.As can be seen here, the heat radiation of Wavelength converter 100, except affecting by the thermal conductivity of each parts constituent itself, depend primarily on the density of luminescent layer 110, the density of diffuse reflector 120 and the interface cohesion degree of diffuse reflector 120 and ceramic substrate 130.
In the present embodiment, luminescent layer 110 is made up of fluorescent powder and the first glass dust, and wherein, the volume fraction that fluorescent powder accounts for luminescent layer 110 is 14.1% ~ 38.7%.
In the present embodiment, luminescent layer 110 is formed by fluorescent powder, the first glass dust and organic carrier mixed sintering, and wherein organic carrier is removed in sintering process, and the first glass dust softens in sintering process and form non-individual body, be filled between fluorescent powder grain, fluorescent powder is wrapped up stratification.Due in luminescent layer 110, fluorescent powder is the main body of wavelength convert effect, and therefore the amount of fluorescent powder determines the amount of the light that Wavelength converter can transform.When fluorescent powder amount is certain, if the ratio that fluorescent powder accounts for luminescent layer 110 is very few, then the thickness of luminescent layer 110 is excessive, causes luminescent layer 110 large along the thermal resistance in calorie spread direction; On the other hand, if the ratio that fluorescent powder accounts for luminescent layer 110 is excessive, then the quantity not sufficient of the first glass dust is to wrap up each fluorescent powder grain, thus make fluorescent powder grain adjacent one another are and form hole, the existence of this hole not only increases the thermal resistance of luminescent layer 110 itself, also add the interface resistance between fluorescent powder grain and the first glass dust, thus make the heat conductivility of luminescent layer 110 low.The present embodiment by experiment, when to obtain volume fraction that fluorescent powder accounts for luminescent layer 110 be 14.1% ~ 38.7%, can take into account luminescent properties and heat conductivility; And when the volume fraction that fluorescent powder accounts for luminescent layer 110 is 29.1% ~ 38.7%, the luminous heat dispersion of luminescent layer 110 is more excellent.
The light that fluorescent powder absorption peak wavelength is shorter the longer light of emission peak wavelength.Concrete, fluorescent powder can the blue light of Selective absorber peak wavelength 420nm ~ 470nm the garnet-base phosphor material powder (Y of the light of emission peak wavelength 500nm ~ 600nm
1-aln
a)
3(Al
1-bga
b)
5o
12: Ce (0≤a≤1,0≤b≤1), also can the blue light of Selective absorber peak wavelength 420nm ~ 470nm the Nitride phosphor (Ca of emission peak wavelength 600nm ~ 660nm
1-a-bsr
aba
b) AlSiN
3: Eu (0≤a≤1,0≤b≤1), wherein Ln is lanthanide series.The average coefficient of linear expansion of this type of fluorescent powder is roughly 7 × 10
-6/ K ~ 9 × 10
-6/ K.
First glass dust is used for bonding fluorescent powder, and as the medium that light and heat is propagated in luminescent layer 110, can select silicate glass powder, borosilicate glass powder, boron phosphate glass powder, zinc phosphate glass powder etc.In the present embodiment, the resistant to elevated temperatures borosilicate glass powder of preferred high transmission rate, its light transmission rate is more than 90%.The average coefficient of linear expansion of this type of glass dust is roughly 3 × 10
-6/ K ~ 3.5 × 10
-6/ K.In the present embodiment, the molar percentage that boron oxide accounts for the first glass dust is 10% ~ 19%, and the molar percentage that monox accounts for the first glass dust is 70% ~ 90%.
In addition, the first glass dust can be the glass dust of single kind, also can be the combination of two or more glass dust.In the present invention, water glass, glass glaze also can be selected to substitute the first glass dust as bonding agent, do not repeat herein.
In the present embodiment, diffuse reflector 120 is made up of white scattering particles and the first glass dust, and wherein, the volume fraction that white scattering particles accounts for diffuse reflector 120 is 22.0% ~ 62.9%, and diffuse reflector 120 is greater than 90% to visible light reflectance.
For once reflect different from mirror-reflection, in the reflection process in the present embodiment, light is through white scattering particles multiple reflections, and along with the increase of order of reflection, light loss is also in increase, and the light of this part loss is converted into heat, thus has a negative impact to the heat radiation of Wavelength converter.When the ratio that white scattering particles accounts for diffuse reflector 120 is too small, at diffuse reflector along being parallel on the tangent plane of its plane of incidence, the distribution of white scattering particles is sparse, and light can continue the internal communication to diffuse reflector until reflected.In order to make the reflectivity of diffuse reflector 120 higher than 90%, diffuse reflector 120 need have enough heavy thickness.And the increase of distance light travels, will light be caused to be increased by the number of times reflected from incidence and diffuse reflector to the process of outgoing, the heat also namely produced increases.On the other hand, when the ratio that white scattering particles accounts for diffuse reflector 120 is excessive, then the quantity not sufficient of the first glass dust is to wrap up each white scattering particles, thus make white scattering particles adjacent one another are and form hole, the existence of this hole not only increases the thermal resistance of diffuse reflector 120 itself, also add the interface resistance between white scattering particles and the first glass dust, thus make the heat conductivility of diffuse reflector 120 low.The present embodiment by experiment, obtain white scattering particles account for diffuse reflection layer by layer 120 volume fraction when being 22.0% ~ 62.9%, reflecting properties and heat conductivility can be taken into account.
After light is incident in diffuse reflector 120, reflect the direction outgoing of backward luminescent layer 110 through white scattering particles.White scattering particles or there is the reflectivity higher to visible ray, or there is high index of refraction and utilize the total reflection character of light to reflect.In the present embodiment, because Wavelength converter 100 temperature is in working order higher, therefore white scattering particles selects chemical stability, aluminium oxide, magnesium oxide, yttria, boron nitride, zinc paste, titanium dioxide or zirconic powder that temperature stability is good, and these materials can both keep stablizing near glass dust softening point temperature.
The glass dust that glass dust in diffuse reflector 120 is preferably identical with the first glass dust in luminescent layer 110, this composition can ensure more firmly to be combined between diffuse reflector 120 with luminescent layer 110, and can not produce space because both thermal expansivity are different in expanding with heat and contract with cold.Certainly, the glass dust in diffuse reflector 120 also can be selected different from luminescent layer 110
In the present embodiment, the heat transfer that luminescent layer 110 and diffuse reflector 120 produce by ceramic substrate 130 also exhales.This ceramic substrate need have good heat conductivility, and its coefficient of heat conductivity is more than or equal to 80W/mK.Ceramic substrate 130 in the present embodiment is aluminium nitride substrate, and it also can select silit or similar material as baseplate material.
Except the thermal conductivity of ceramic substrate 130 itself, the interface resistance that ceramic substrate 130 contacts with diffuse reflector 120 and produces is the pith that Wavelength converter dispels the heat.Because diffuse reflector 120 has coated glass powder and white scattering particles mixed slurry high temperature sintering on ceramic substrate 130 to be formed, if the thermal expansivity of diffuse reflector 120 and ceramic substrate 130 gap excessive, diffuse reflector can produce larger thermal stress in High-temperature cooling process, unrestrained its is caused to produce micro-crack, even more serious will generation comes off, and causes ceramic substrate 130 and diffuse reflector 120 thermal resistance to increase.
Because the constituent of each layer is different, these different compositions have different averages coefficient of linear expansion respectively, when Wavelength converter is by heating and cooling process, the deformation of diffuse reflector 120 is different from the deformation of ceramic substrate 130, thus cause its generation space, interface, and then cause its interface resistance to increase, the heat radiation of Wavelength converter is had a negative impact.
Linear expansion coefficient due to white scattering particles and fluorescent powder is greater than the linear expansion coefficient of the first glass dust, according to the thermal expansivity computing method of compound substance, the average coefficient of linear expansion of luminescent layer 110 is between fluorescent powder and the linear expansion coefficient of the first glass dust, namely the average coefficient of linear expansion of diffuse reflector 120 is between white scattering particles and the linear expansion coefficient of the first glass dust, and also the linear expansion coefficient of ceramic substrate is greater than the linear expansion coefficient of the first glass dust and is less than the linear expansion coefficient of fluorescent powder and white scattering particles.Therefore, select ceramic substrate to make the average coefficient of linear expansion of its thermal expansivity and luminescent layer 110 and diffuse reflector 120 close, the interface resistance that can reduce as far as possible to cause because thermal expansivity does not mate is large.In the present embodiment, linear expansion coefficient is selected to be 4 × 10
-6/ K ~ 6 × 10
-6the aluminium nitride substrate of/K, can not only ensure heat conductivility and the physical strength of substrate, and it can not produce larger interface resistance because not mating with diffuse reflector thermal expansivity in manufacture or use procedure.
The preparation method of the Wavelength converter 100 in the present embodiment one is as follows:
Step one: ceramic substrate 130 is provided;
Step 2: by obtained for the mixing of white scattering particles, the first glass dust and organic carrier diffuse reflector slurry, this slurry is covered on the treated surface of ceramic substrate 130, obtained diffuse reflector raw cook, the first glass powder generation softening transform in diffuse reflector raw cook;
Step 3: by obtained for the mixing of fluorescent powder, the first glass dust and organic carrier luminescent layer slurry, this slurry is covered on diffuse reflector raw cook, obtained luminescent layer raw cook;
Step 4: the lamination of luminescent layer raw cook, diffuse reflector raw cook and ceramic substrate is sintered jointly, obtained Wavelength converter.
In step 2, diffuse reflector raw cook is without sintering, and the first glass dust does not experience softening process, eliminates part organic carrier by means of only low-temperature bake, and therefore diffuse reflector raw cook does not form a densification, continuous print surface structure.In step 4, luminescent layer raw cook, diffuse reflector raw cook and ceramic substrate sinter jointly, wherein the first glass dust of the surface of contact both sides of luminescent layer raw cook and diffuse reflector raw cook mobility near its softening point strengthens, glass dust is bonded to each other becomes non-individual body, make to define continuous transition layer between luminescent layer and diffuse reflector, this continuous transition layer does not have obvious phase interface, and the interface resistance therefore between luminescent layer and diffuse reflector is very little, thus heat transfer property is good.
In above-mentioned preparation process, organic carrier is used for making fluorescent powder and the first glass dust or white scattering particles and the first glass dust Homogeneous phase mixing, can select one or more mixture in the silicone oil of each individual system such as phenyl, methyl, ethanol, ethylene glycol, dimethylbenzene, ethyl cellulose, terpilenol, butyl carbitol, PVA, PVB, PAA, PEG.Organic carrier can promote that glass dust mixes with fluorescent powder or white scattering particles, and its major part is decomposed in sintering process, but also likely has few part to remain in Wavelength converter.
In the Wavelength converter that the embodiment of the present embodiment is obtained, the volume fraction that fluorescent powder accounts for luminescent layer 110 is 29.1%, and the volume fraction that white scattering particles accounts for diffuse reflector 120 is 49.2%.Under exciting light irradiates, the initial luminous intensity recording Wavelength converter 100 is 2875.6lm, after 2 minutes irradiate, the luminous intensity recording Wavelength converter 100 have dropped 6.3%, and this luminous intensity and attenuation degree can meet the application of Wavelength converter 100 in light-emitting device.
In more comparative example, do not change the volume fraction that fluorescent powder accounts for luminescent layer 110, only change the volume fraction of the white scattering particles in diffuse reflector 120, under the irradiation of laser, measure Wavelength converter 100 initial luminescence respectively and through two minutes postradiation luminous intensities, obtain comparing result as shown in table 1.Wherein white scattering particles accounts for the volume fraction of diffuse reflector 120 when being 22.0%, and initial luminous intensity is 2855.1lm, decays 5.8% after two minutes; When the volume fraction that white scattering particles accounts for diffuse reflector 120 is 53.0%, initial luminous intensity is 2963.3lm, decays 7.3% after two minutes; When the volume fraction that white scattering particles accounts for diffuse reflector 120 is 62.9%, initial luminous intensity is 2980.4lm, decays 6.9% after two minutes; When the volume fraction that white scattering particles accounts for diffuse reflector 120 is 69.3%, initial luminous intensity is 2923.8lm, and decay 66.0% after two minutes, under this ratio, radiating effect is very poor, have impact on the normal use of Wavelength converter 100.The volume fraction that fluorescent powder accounts for luminescent layer 110 get except 29.1% 14.1% ~ 38.7% between other numerical value time, change the volume fraction of white scattering particles in diffuse reflector, still can obtain similar conclusion.
The different white scattering particles volume fraction of table 1 is on the impact of device luminous intensity and stability
Visible when the volume fraction of white scattering particles is less, the light loss of Wavelength converter is comparatively large, causes its luminous intensity lower; And when the volume fraction of white scattering particles is larger, the thermal resistance of diffuse reflector increases, cause its heat to distribute, make the rising of fluorescent powder working temperature, light conversion efficiency decline.
In other comparative examples of the present embodiment, the diffuse reflector 120 of Wavelength converter comprise volume fraction be 49.2% white scattering particles constant, change the volume fraction of the fluorescent powder in luminescent layer 110, under the irradiation of laser, measure Wavelength converter 100 initial luminescence respectively and through two minutes postradiation luminous intensities, obtain result as shown in table 2.Wherein fluorescent powder accounts for the volume fraction of luminescent layer 110 when being 14.1%, and initial luminous intensity is 2544.5lm, and decay 5.4% after two minutes, under this ratio, fluorescent powder amount is less, and illumination effect is not high; When the volume fraction that fluorescent powder accounts for luminescent layer 110 is 19.0%, initial luminous intensity is 2593.4lm, decays 5.6% after two minutes; When the volume fraction that fluorescent powder accounts for luminescent layer 110 is 31.3%, initial luminous intensity is 2875.6lm, decays 6.9% after two minutes; When the volume fraction that fluorescent powder accounts for luminescent layer 110 is 37.0%, initial luminous intensity is 2877.0lm, decays 8.4% after two minutes; When the volume fraction that fluorescent powder accounts for luminescent layer 110 is 38.7%, initial luminous intensity is 2882.6lm, decays 9.8% after two minutes.
The volume fraction of white scattering particles get except 49.2% 22.0% ~ 62.9% between other numerical value time, change the volume fraction of fluorescent powder in luminescent layer, still can obtain similar conclusion.
The different fluorescent powder volume fraction of table 2 is on the impact of luminous intensity and stability
Visible, when fluorescent powder volume fraction is less, luminescent layer 110 absorbs and the exciting light changed is few, causes the luminous intensity of Wavelength converter 100 low; And when fluorescent powder volume fraction is larger, although the initial luminous intensity of Wavelength converter 100 improves, luminescent layer internal void increases, and causes its thermal resistance to increase, the heat causing fluorescent powder to produce cannot distribute, and makes the rising of fluorescent powder working temperature, light conversion efficiency decline.
But, in other serial experiment, the volume fraction of such as getting fluorescent powder was 52% (exceeding 14.1% ~ 38.7%), changed the volume fraction of white scattering particles, find Wavelength converter or luminous intensity is low, or luminous intensity decay is very fast; In like manner, extracting waste scattering particle is constant in 72% (exceeding 22.0% ~ 62.9%), and changes the volume fraction of fluorescent powder, found that the decay of Wavelength converter luminous intensity is very fast.
Draw through above-mentioned serial experiment, the volume fraction of the white scattering particles of diffuse reflector and the fluorescent powder of luminescent layer must be in certain scope, this proportion requirement must be met simultaneously simultaneously, both could ensure that there is high reflectance and luminescence efficiency, there is again lower thermal resistance, in the present embodiment, the volume fraction that white scattering particles accounts for diffuse reflector is 22.0% ~ 62.9%, the volume fraction that fluorescent powder accounts for luminescent layer is 14.1% ~ 38.7%, then can meet the emergent light making Wavelength converter have stable high-luminous-efficiency.For improving the luminous intensity of Wavelength converter further, the volume fraction that fluorescent powder accounts for luminescent layer is preferably 29.1% ~ 38.7%.
Embodiment two
Refer to Fig. 2, Fig. 2 is the structural representation of the embodiment two of Wavelength converter of the present invention.As shown in the figure, Wavelength converter 200 comprises luminescent layer 210, diffuse reflector 220 and ceramic substrate 230, with embodiment one unlike, in the present embodiment, Wavelength converter 200 also comprises bonding interface layer 231.
In the present embodiment, ceramic substrate 230 is aluminium nitride substrate, and bonding interface layer 231 is alumina layer, and alumina layer 231 is formed at the surface of aluminium nitride substrate 230, belongs to a part for ceramic substrate 230.
The preparation method of the Wavelength converter 200 in the present embodiment is as follows:
Step one: provide aluminium nitride substrate 230, carries out surface densification process to aluminium nitride substrate 230, heats 0.5 ~ 2h at being specifically included in 800 ~ 1000 DEG C to aluminium nitride substrate 230, obtain alumina layer 231;
Step 2: by obtained for the mixing of white scattering particles, the first glass dust and organic carrier diffuse reflector slurry, this slurry is covered on the treated surface of aluminium nitride substrate 230, obtained diffuse reflector raw cook, the first glass powder generation softening transform in diffuse reflector raw cook;
Step 3: by obtained for the mixing of fluorescent powder, the first glass dust and organic carrier luminescent layer slurry, this slurry is covered on diffuse reflector raw cook, obtained luminescent layer raw cook;
Step 4: the lamination of luminescent layer raw cook, diffuse reflector raw cook and aluminium nitride substrate is sintered jointly, obtained Wavelength converter.
Because aln surface easily forms loose oxide layer, this by cause diffuse reflector and ceramic substrate in conjunction with time real contact area large not, and from diffuse reflector, ceramic substrate be delivered to heat have a negative impact.Therefore, the present embodiment does surface treatment to ceramic substrate 230, by high temperature oxidation process, makes aluminium nitride substrate 230 surface form fine and close alumina layer 231, thus makes ceramic substrate 230 and diffuse reflector 220 by alumina layer 231 close proximity.This alumina layer 231 thickness is 0.1 μm ~ 100 μm, and this thickness can not cause the thermal resistance of Wavelength converter 200 to produce significant change.
In addition, the weaker zone on aluminium nitride substrate 230 surface can also be removed by the method for acid corrosion, replace with by the step one in the present embodiment preparation method, aluminium nitride substrate 231 is placed in acid solution immersion corrosion.This processing procedure can remove the loose oxidation structure of aln surface.
In other embodiments, also surface oxidation treatment and surface corrosion process can be combined, initial oxidation process corrosion treatment again, or first corrosion treatment reoxidizes process.
Embodiment three
Refer to Fig. 3, Fig. 3 is the structural representation of the embodiment three of Wavelength converter of the present invention.As shown in the figure, Wavelength converter 300 comprises luminescent layer 310, diffuse reflector 320, ceramic substrate 330 and bonding interface layer 340.With embodiment two unlike, in the present embodiment, bonding interface layer 340 is the Rotating fields independent of ceramic substrate 330.
In the present embodiment, bonding interface layer 340 is glass adhesive linkage, and this glass adhesive linkage comprises and the first identical glass dust in diffuse reflector 320.
Due to the problem of preparation technology, when ceramic substrate 330 fires diffuse reflector 320, possible adularescent scattering particle directly contacts with ceramic substrate 330.Due to white scattering particles not as glass dust as experience soften reshaping process, therefore the contact area of itself and ceramic substrate 330 is little, and can produce hole around it, thus causes interface resistance large.Therefore the present embodiment is by increasing glass adhesive linkage 340 on ceramic substrate 330 surface, prevents from contacting with ceramic substrate between white scattering particles.Certainly, the present invention also can select the glass dust different from the first glass dust as glass adhesive linkage 340.
In a variant embodiment of the present embodiment, bonding interface layer 340 is silver-colored glass adhesive linkage, and this silver-colored glass adhesive linkage comprises nano-Ag particles and the second glass dust.Nano-Ag particles is dispersed in this silver-colored glass adhesive linkage 340, increases the thermal conductivity of silver-colored glass adhesive linkage 340, makes it have more excellent heat conductivility relative to glass adhesive linkage.Wherein, the softening point of the second glass dust is lower than the first glass dust in diffuse reflector 320.On the one hand, the softening point of the second glass dust is low, ensure that Nano Silver in sintering process can not temperature too high and be oxidized; On the other hand, the softening point of the second glass dust, lower than the softening point of the first glass dust, makes the relative diffuse reflector of its mobility in sintering process stronger, better can fill the hole in ceramic substrate 330 and diffuse reflector 320.In addition, silver-colored glass adhesive linkage 340 thinner thickness, will cause the Rotating fields of Wavelength converter to be destroyed because the second glass dust mobility in sintering process is strong.
The preparation method of the Wavelength converter 300 in the present embodiment is as follows:
Step one: provide aluminium nitride substrate 330, carries out surface densification process to aluminium nitride substrate 330, at aluminium nitride substrate 330 surface coverage one deck bonding interface layer;
Step 2: by obtained for the mixing of white scattering particles, the first glass dust and organic carrier diffuse reflector slurry, this slurry is covered on the treated surface of aluminium nitride substrate 330, obtained diffuse reflector raw cook, the first glass powder generation softening transform in diffuse reflector raw cook;
Step 3: by obtained for the mixing of fluorescent powder, the first glass dust and organic carrier luminescent layer slurry, this slurry is covered on diffuse reflector raw cook, obtained luminescent layer raw cook;
Step 4: the lamination of luminescent layer raw cook, diffuse reflector raw cook and aluminium nitride substrate is sintered jointly, obtained Wavelength converter.
Wherein, the bonding interface layer in step one can be the first glass dust adhesive linkage or silver-colored glass adhesive linkage.
Present invention also offers a kind of light-emitting device, this light-emitting device comprises excitation source and Wavelength converter, and wherein Wavelength converter can have the structure and fuction in the various embodiments described above.This light-emitting device can be applied to projection, display system, such as liquid crystal display (LCD, LiquidCrystalDisplay) or digital light path processor (DLP, DigitalLightProcessor) projector; Also illuminator can be applied to, such as car lighting lamp; Also can be applied in 3D display technique field.Present invention also offers a kind of optical projection system, this optical projection system comprises light-emitting device and projection arrangement, and wherein light-emitting device can have the structure and fuction of above-mentioned light-emitting device.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. a Wavelength converter, is characterized in that, comprising:
Luminescent layer stacked successively, diffuse reflector and ceramic substrate;
Described luminescent layer comprises fluorescent powder and the first glass dust, and wherein, the volume fraction that described fluorescent powder accounts for described luminescent layer is 14.1% ~ 38.7%;
Described diffuse reflector comprises white scattering particles and the first glass dust, and wherein, the volume fraction that described white scattering particles accounts for described diffuse reflector is 22.0% ~ 62.9%;
The linear expansion coefficient of described ceramic substrate is greater than the linear expansion coefficient of described first glass dust;
The linear expansion coefficient of described ceramic substrate is less than the linear expansion coefficient of described fluorescent powder;
The linear expansion coefficient of described ceramic substrate is less than the linear expansion coefficient of described white scattering particles.
2. Wavelength converter according to claim 1, is characterized in that, the volume fraction that described fluorescent powder accounts for described luminescent layer is 29.1% ~ 38.7%.
3. Wavelength converter according to claim 1, is characterized in that, the linear expansion coefficient of described ceramic substrate is 4.0 × 10
-6/ K ~ 6.0 × 10
-6/ K, the coefficient of heat conductivity of described ceramic substrate is more than or equal to 80W/mK.
4. Wavelength converter according to claim 1, is characterized in that, described ceramic substrate is the one in aluminium nitride substrate, silicon carbide substrate.
5. Wavelength converter according to claim 1, is characterized in that, also comprises bonding interface layer, between described ceramic substrate and described diffuse reflector.
6. Wavelength converter according to claim 5, is characterized in that, described bonding interface layer is alumina layer.
7. Wavelength converter according to claim 6, is characterized in that, described ceramic substrate is aluminium nitride substrate, and described alumina layer is that the surface of described aluminium nitride substrate obtains through oxidation processes.
8. Wavelength converter according to claim 5, is characterized in that, described bonding interface layer is glass adhesive linkage, and this glass adhesive linkage comprises the first glass dust.
9. Wavelength converter according to claim 5, is characterized in that, described bonding interface layer is silver-colored glass adhesive linkage, and this silver-colored glass adhesive linkage comprises silver, the second glass dust, and the fusing point of described second glass dust is lower than described first glass dust.
10. the Wavelength converter according to claim 1 or 4, is characterized in that, the surface of described ceramic substrate is the surface through corrosion treatment.
11. Wavelength converters according to claim 1, is characterized in that, described first glass dust is borosilicate glass, and the molar percentage of the boron oxide in this first glass dust is 10% ~ 19%, and the molar percentage of monox is 70% ~ 90%.
12. Wavelength converters according to claim 1, is characterized in that, described first glass dust is the combination of in silicate glass powder, borosilicate glass powder, boron phosphate glass powder, zinc phosphate glass powder at least two kinds.
13. Wavelength converters according to claim 1, is characterized in that, described white scattering particles is the combination of one or more in aluminium oxide, magnesium oxide, boron nitride, yttria, zinc paste, titanium dioxide and zirconia.
14. Wavelength converters according to claim 1, is characterized in that, described diffuse reflector is greater than 90% to visible light reflectance.
15. Wavelength converters according to claim 1, is characterized in that, the structural formula of described fluorescent powder is (Y
1-aln
a)
3(Al
1-bga
b)
5o
12: Ce or (Ca
1-a-bsr
aba
b) AlSiN
3: Eu, wherein 0≤a≤1,0≤b≤1, Ln is lanthanide series.
16. Wavelength converters according to claim 1, is characterized in that, are continuous transition layer between described luminescent layer and described diffuse reflector.
17. 1 kinds of methods preparing Wavelength converter, comprise the steps:
Step one: ceramic substrate is provided;
Step 2: by obtained for the mixing of white scattering particles, the first glass dust and organic carrier diffuse reflector slurry, described diffuse reflector slurry is covered on the treated surface of described ceramic substrate, obtained diffuse reflector raw cook, the volume fraction that described white scattering particles accounts for the cumulative volume of white scattering particles and the first glass dust is 22.0% ~ 62.9%; The linear expansion coefficient of described white scattering particles is greater than the linear expansion coefficient of described ceramic substrate; The linear expansion coefficient of described first glass dust is less than the linear expansion coefficient of described ceramic substrate;
Step 3: by obtained for the mixing of fluorescent powder, the first glass dust and organic carrier luminescent layer slurry, described luminescent layer slurry is covered on diffuse reflector raw cook, obtained luminescent layer raw cook, the volume fraction that described fluorescent powder accounts for the cumulative volume of fluorescent powder and the first glass dust is 14.1% ~ 38.7%; The linear expansion coefficient of described fluorescent powder is greater than the linear expansion coefficient of described ceramic substrate;
Step 4: described luminescent layer raw cook, diffuse reflector raw cook and ceramic substrate are sintered jointly, obtained Wavelength converter.
18. methods preparing Wavelength converter according to claim 17, it is characterized in that, described step one comprises: make oxidation processes to form oxide layer to described ceramic base plate surface, or corrosion treatment is done to described ceramic base plate surface, or to described ceramic base plate surface initial oxidation process corrosion treatment again, or process is reoxidized to the first corrosion treatment of described ceramic base plate surface.
19. 1 kinds of light-emitting devices, comprise the Wavelength converter described in any one in excitation source and claim 1-16.
20. 1 kinds of projection arrangements, comprise light-emitting device as claimed in claim 19.
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