WO2019174226A1 - Wavelength conversion device and preparation method therefor - Google Patents
Wavelength conversion device and preparation method therefor Download PDFInfo
- Publication number
- WO2019174226A1 WO2019174226A1 PCT/CN2018/110334 CN2018110334W WO2019174226A1 WO 2019174226 A1 WO2019174226 A1 WO 2019174226A1 CN 2018110334 W CN2018110334 W CN 2018110334W WO 2019174226 A1 WO2019174226 A1 WO 2019174226A1
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- Prior art keywords
- diffuse reflection
- particles
- wavelength conversion
- conversion device
- substrate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
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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
-
- 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
-
- 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
Definitions
- the invention relates to a wavelength conversion device and a preparation method thereof, and belongs to the technical field of optical transmission.
- the diffuse reflection layer of the wavelength conversion device is generally formed by mixing and sintering white diffuse reflection particles and glass powder. Due to the simple preparation process and high reliability, it has become the diffuse reflection layer of the mainstream wavelength conversion device.
- the particle size of the above white diffuse reflection particles is in the submicron range of 0.2 to 0.5 ⁇ m, and the glass powder as the binder can only provide particles having a particle diameter of 1 ⁇ m, that is, the particle size ratio of the binder particles, due to process limitations.
- the particle size of the particles to be bonded is large. In the sintering process, it is limited by the isolation of the large-size glass frit, and the adhered white diffuse reflection particles are difficult to form a close-packed structure, and the reflectance of the diffuse reflection layer is difficult to be further improved.
- a method of increasing the content of the diffuse reflection particles in the diffuse reflection layer and increasing the thickness of the diffuse reflection layer is generally employed.
- the content of the diffuse reflection particles increases, the adhesion between the diffuse reflection layer and the substrate decreases, the reliability decreases, and the heat resistance of the thick diffuse reflection layer is high, which is disadvantageous for heat dissipation.
- the diffuse reflection layer structure of the existing wavelength conversion device cannot simultaneously ensure high reflection and low thermal resistance, which is disadvantageous for the improvement of brightness and efficiency in wavelength conversion efficiency.
- the technical problem to be solved by the present invention is to provide a wavelength conversion device and a preparation method thereof according to the deficiencies of the prior art, and adopt submicron diffuse reflection particles and without changing the thickness of the existing diffuse reflection layer and the concentration of diffuse reflection particles.
- the nano diffuse reflection particles together form a diffuse reflection layer, achieving higher reflectivity, and the diffuse reflection layer and the substrate can form a good bond, so that the efficiency and brightness of the wavelength conversion device are higher.
- the present invention provides a wavelength conversion device comprising a substrate and a diffuse reflection layer disposed on the substrate, the diffuse reflection layer comprising white diffuse reflection particles and a binder, the white diffuse reflection particles including primary diffuse reflection particles and auxiliary particles
- the main diffuse reflection particles have a particle diameter ranging from 0.1 ⁇ m to 10 ⁇ m
- the auxiliary particles have a particle diameter ranging from 10 nm to 100 nm.
- the substrate is an alumina ceramic, a sapphire crystal, an aluminum nitride ceramic, a silicon carbide ceramic, a silicon nitride ceramic or a boron nitride ceramic.
- the substrate has a thermal conductivity higher than 10 W/mK.
- the binder is glass frit, glaze or water glass.
- the glass frit has a particle size of ⁇ 2 ⁇ m.
- the auxiliary particles are alumina, barium sulfate or aluminum silicate.
- the content of the auxiliary particles in the white diffuse reflection particles is 9 wt% to 33 wt%, and the mass ratio of the white diffuse reflection particles to the binder is > 1.2:1.
- the main diffuse reflection particles have a particle diameter ranging from 0.1 ⁇ m to 1 ⁇ m.
- the present invention also provides a method for preparing a wavelength conversion device, the preparation method comprising: mixing an organic carrier and the white diffuse reflection particles and a binder as described above to form a mixed slurry;
- the mixed slurry is coated on a substrate and sintered to form a wavelength conversion device.
- the sintering is specifically pre-baking the substrate coated with the mixed slurry at 60 ° C to 150 ° C, followed by sintering at 700 ° C to 1000 ° C.
- the present invention uses a sub-micron diffuse reflection particle and a nano-diffuse reflection particle to form a diffuse reflection layer without changing the thickness of the existing diffuse reflection layer and the diffuse reflection particle concentration, thereby realizing a higher reflectance.
- the diffuse reflection layer and the substrate can form a good bond, so that the efficiency and brightness of the wavelength conversion device are higher.
- FIG. 1 is a schematic structural view of a wavelength conversion device according to the present invention.
- Fig. 3 is a partial enlarged view of Fig. 2;
- FIG. 1 is a schematic structural view of a wavelength conversion device according to the present invention
- FIG. 2 is an SEM image of the diffuse reflection layer of the present invention
- FIG. 3 is a partial enlarged view of FIG.
- the present invention provides a wavelength conversion device including a substrate 100 and a diffuse reflection layer 200 disposed on the substrate 100.
- the diffuse reflection layer 200 has a thickness of ⁇ 80 ⁇ m, preferably, a thickness ⁇ 50 ⁇ m, and more preferably, a thickness ranging from 5 ⁇ m to 30 ⁇ m.
- the substrate 100 is an alumina ceramic, a sapphire crystal, an aluminum nitride ceramic, a silicon carbide ceramic, a silicon nitride ceramic or a boron nitride ceramic.
- the substrate 100 has a thermal conductivity higher than 10 W/mK.
- the diffuse reflection layer 200 includes white diffuse reflection particles 210 and a binder 220.
- the binder 220 is glass powder, glaze or water glass. When glass powder is used as the binder 220, the particle size of the glass powder is used. ⁇ 2 ⁇ m, preferably, the glass frit has a particle diameter of ⁇ 1 ⁇ m.
- the white diffuse reflection particles 210 include main diffuse reflection particles 211 and auxiliary particles 212, and the main diffuse reflection particles 211 have a particle diameter ranging from 0.1 ⁇ m to 10 ⁇ m.
- the main diffuse reflection particles 211 have a particle diameter ranging from 0.1 ⁇ m. ⁇ 5 ⁇ m, more preferably, the main diffuse reflection particles 211 have a particle diameter ranging from 0.1 ⁇ m to 1 ⁇ m, and more preferably, the main diffuse reflection particles 211 have a particle diameter ranging from 0.1 ⁇ m to 0.5 ⁇ m.
- the main diffuse reflection particles 211 are one or more of alumina, barium sulfate, titanium oxide, zinc oxide, cerium oxide, and zirconia.
- the main diffuse reflection particles 211 include titanium oxide and aluminum oxide.
- the auxiliary particles 212 have a particle diameter ranging from 10 nm to 100 nm, and the auxiliary particles 212 are aluminum oxide, barium sulfate or aluminum silicate.
- the auxiliary particles 212 are contained in the white diffuse reflection particles 210 at a content of 9 wt%. ⁇ 33wt%.
- the mass ratio of the white diffuse reflection particles 210 to the binder 220 is >1.2:1, preferably, the mass ratio is >1.5:1, more preferably, the mass ratio is >2:1, and more preferably, the mass ratio is 3: 1.
- the invention also provides a preparation method of a wavelength conversion device:
- the mixed slurry is coated on a substrate and sintered to form a wavelength conversion device.
- the sintering is specifically pre-baking the substrate coated with the mixed slurry at 60 ° C to 150 ° C, followed by sintering at 700 ° C to 1000 ° C.
- alumina ceramics may be used as the substrate 100, and titanium oxide particles having a particle diameter ranging from 0.2 ⁇ m to 0.5 ⁇ m, alumina particles of 0.2 ⁇ m to 0.5 ⁇ m, and 0.01 ⁇ m to 0.1 may be used.
- ⁇ m alumina particles and 1 ⁇ m borosilicate glass powder are mixed with an organic vehicle formed by mixing and dissolving ethyl cellulose, terpineol, butyl carbitol, and butyl carbitol to form a mixed slurry.
- the mixed slurry is scraped onto the substrate 100, pre-baked at 60 ° C to 150 ° C for 2 min to 60 min, and then placed in a muffle furnace at 800 ° C to 1000 ° C for 2 min to 1 h to form a diffuse reflection layer on the substrate 100. 200.
- the inventors have found that a certain distance between the main diffuse reflection particles 211 is required. Too small and too large are not conducive to the improvement of the reflectance. The pitch is too small, and the main diffuse reflection particles 211 reduce the reflectance due to optical blocking. If the glass powder has a large particle size and a low content, a sufficient liquid phase cannot be formed, and the larger glass molten particles occupy a large space, which has an adverse effect on the reflectance; the auxiliary particles 212 are added. The blank of the glass melt is filled, the density of the white diffuse reflection particles 210 is increased, and the reflectance is improved. In other words, adding a small amount of diffuse reflection particles of nanometer particle size to the submicron diffuse reflection particles can effectively fill the reflectance loss of the sintered surface of the glass particles.
- the glass powder is not sintered. Forming a completely molten flow state, substantially maintaining the original particle size of about 2 ⁇ m, and the main diffuse reflection particles 211 having a particle diameter of 0.1 ⁇ m to 0.5 ⁇ m are adhered around the glass frit, and the particle size of the main diffuse reflection particles 211 is as shown in the figure. As shown by D1 in 3, D1 is 255.44 nm. Due to the spacing effect of the large glass frit, the main diffuse reflection particles 211 cannot completely cover the glass frit, thus leaving a large blank area. This blank area can be just The smaller particle size nanoparticles (auxiliary particles 212) are filled. As can be seen from Fig.
- auxiliary particles 212 As shown by D2 in Fig. 3, and D2 was measured to be 23.94 nm.
- Table 1 shows the effect of the nanoparticle content on the reflectivity of the diffuse reflection layer.
- the reflectance is obtained according to the standard diffuse reflection SRS-99-010 of Lanfei Company, which is obtained by relative sphere test.
- the reflectance can further increase the reflectance by 1% to 2%.
- the content of the auxiliary particles 212 is insufficient to cover the surface of the glass particles, and the reflectance is not greatly affected.
- the content is more than 33% by weight, the content of the main diffuse reflection particles 211 is insufficient, and thus the reflectance is not high.
- the present invention uses a sub-micron diffuse reflection particle and a nano-diffuse reflection particle to form a diffuse reflection layer without changing the thickness of the existing diffuse reflection layer and the diffuse reflection particle concentration, thereby realizing a higher reflectance.
- the diffuse reflection layer and the substrate can form a good bond, so that the efficiency and brightness of the wavelength conversion device are higher.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
辅助粒子含量Auxiliary particle content | 0wt%0wt% | 9wt%9wt% | 15wt%15wt% | 17wt%17wt% | 25wt%25wt% | 33wt%33wt% | 50wt%50wt% |
反射率Reflectivity | 90.5%90.5% | 91.4%91.4% | 91.9%91.9% | 93.0%93.0% | 92.6%92.6% | 91.8%91.8% | 90.8%90.8% |
Claims (10)
- 一种波长转换装置,包括基板(100)以及设置在基板上的漫反射层(200),其特征在于,所述漫反射层包括白色漫反射粒子(210)以及粘结剂(220),所述白色漫反射粒子包括主漫反射粒子(211)和辅助粒子(212),所述主漫反射粒子的粒径范围为0.1μm~10μm,所述辅助粒子的粒径范围为10nm~100nm。A wavelength conversion device comprising a substrate (100) and a diffuse reflection layer (200) disposed on the substrate, wherein the diffuse reflection layer comprises white diffuse reflection particles (210) and a binder (220). The white diffuse reflection particles include main diffuse reflection particles (211) and auxiliary particles (212), the main diffuse reflection particles have a particle diameter ranging from 0.1 μm to 10 μm, and the auxiliary particles have a particle diameter ranging from 10 nm to 100 nm.
- 如权利要求1所述的波长转换装置,其特征在于,所述基板(100)为氧化铝陶瓷、蓝宝石晶体、氮化铝陶瓷、碳化硅陶瓷、氮化硅陶瓷或氮化硼陶瓷。The wavelength conversion device according to claim 1, wherein the substrate (100) is an alumina ceramic, a sapphire crystal, an aluminum nitride ceramic, a silicon carbide ceramic, a silicon nitride ceramic or a boron nitride ceramic.
- 如权利要求2所述的波长转换装置,其特征在于,所述基板(100)的热导率高于10W/mK。The wavelength conversion device according to claim 2, wherein the substrate (100) has a thermal conductivity higher than 10 W/mK.
- 如权利要求1所述的波长转换装置,其特征在于,所述粘结剂(220)为玻璃粉、釉料或者水玻璃。The wavelength conversion device according to claim 1, wherein the binder (220) is glass frit, glaze or water glass.
- 如权利要求4所述的波长转换装置,其特征在于,所述玻璃粉的粒径≤2μm。The wavelength conversion device according to claim 4, wherein the glass frit has a particle diameter of ≤ 2 μm.
- 如权利要求1所述的波长转换装置,其特征在于,所述辅助粒子(212)为氧化铝、硫酸钡或硅酸铝。The wavelength conversion device according to claim 1, wherein the auxiliary particles (212) are alumina, barium sulfate or aluminum silicate.
- 如权利要求1所述的波长转换装置,其特征在于,所述辅助粒子(212)在白色漫反射粒子(210)中的含量为9wt%~33wt%,所述白色漫反射粒子(210)与粘结剂(220)的质量比>1.2:1。The wavelength conversion device according to claim 1, wherein said auxiliary particles (212) are contained in the white diffuse reflection particles (210) in an amount of from 9 wt% to 33 wt%, and said white diffuse reflection particles (210) are The mass ratio of the binder (220) was >1.2:1.
- 如权利要求1所述的波长转换装置,其特征在于,所述主漫反射粒子的粒径范围为0.1μm~1μm。The wavelength conversion device according to claim 1, wherein the main diffuse reflection particles have a particle diameter ranging from 0.1 μm to 1 μm.
- 一种波长转换装置的制备方法,其特征在于,所述的制备方法包括:A method for preparing a wavelength conversion device, characterized in that the preparation method comprises:将有机载体和如权利要求1-8中任一项所述的白色漫反射粒子、粘结剂混合,形成混合浆料;Mixing the organic vehicle and the white diffuse reflection particles and the binder according to any one of claims 1-8 to form a mixed slurry;将所述混合浆料涂覆在基板上,烧结形成波长转换装置。The mixed slurry is coated on a substrate and sintered to form a wavelength conversion device.
- 如权利要求9所述的制备方法,其特征在于,所述烧结具体为将涂覆有所述混合浆料的所述基板在60℃~150℃下预烘干,之后在700℃~1000℃下烧结。The preparation method according to claim 9, wherein the sintering is specifically pre-drying the substrate coated with the mixed slurry at 60 ° C to 150 ° C, and then at 700 ° C to 1000 ° C. Sintered.
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US20210389512A1 (en) * | 2018-09-25 | 2021-12-16 | Appotronics Corporation Limited | Light reflecting material, reflecting layer and preparation method therefor |
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CN114296166B (en) * | 2021-12-03 | 2024-09-03 | 中山大学 | Reflection rotating wheel device and application thereof in laser speckle elimination |
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