WO2019174226A1 - Wavelength conversion device and preparation method therefor - Google Patents

Wavelength conversion device and preparation method therefor Download PDF

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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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diffuse reflection
particles
wavelength conversion
conversion device
substrate
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PCT/CN2018/110334
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French (fr)
Chinese (zh)
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田梓峰
徐虎
段银祥
许颜正
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深圳光峰科技股份有限公司
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Publication of WO2019174226A1 publication Critical patent/WO2019174226A1/en

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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
    • 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

A wavelength conversion device, comprising a substrate (100) and a diffuse reflection layer (200) provided on the substrate. The diffuse reflection layer comprises white diffuse reflection particles (210) and a binder (220). The white diffuse reflection particles comprise main diffuse reflection particles (211) and auxiliary particles (212), the range of the particle size of the main diffuse reflection particles being 0.1-10 µm and the range of the particle size of the auxiliary particles being 10-100 nm. By jointly forming a diffuse reflection layer by submicro diffuse reflection particles and nano diffuse reflection particles, higher reflectivity is implemented. In addition, the diffuse reflection layer and a substrate can be well bounden, thereby implementing higher efficiency and brightness of a wavelength conversion device.

Description

波长转换装置及其制备方法Wavelength conversion device and preparation method thereof 技术领域Technical field
本发明涉及一种波长转换装置及其制备方法，属于光传输技术领域。The invention relates to a wavelength conversion device and a preparation method thereof, and belongs to the technical field of optical transmission.
背景技术Background technique
目前波长转换装置的漫反射层一般采用白色漫反射粒子和玻璃粉混合烧结形成，由于制备工艺简单，可靠性高，其已经成为主流波长转换装置的漫反射层。At present, 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.
上述白色漫反射粒子的粒径位于0.2～0.5μm的亚微米范围内，而作为粘接剂的玻璃粉，由于工艺限制，最小只能提供1μm粒径的粒子，即粘接粒子的粒径比被粘接粒子的粒径大。在烧结过程中受限于大粒径玻璃粉的隔离，被粘接的白色漫反射粒子很难形成密堆积结构，漫反射层的反射率难以进一步提升。The particle size of the above white diffuse reflection particles is in the submicron range of 0.2 to 0.5 μm, and the glass powder as the binder can only provide particles having a particle diameter of 1 μm, 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.
为了提高漫反射层的反射率，一般采用增加漫反射层中漫反射粒子含量和增加漫反射层厚度的方式。然而随着漫反射粒子含量增高，漫反射层与基板的粘接力下降，可靠性降低，并且较厚的漫反射层的热阻较高，不利于散热。由于上述原因，现有的波长转换装置的漫反射层结构无法同时保证高反射和低热阻，不利于波长转换效率中亮度和效率的提升。In order to increase the reflectance of the diffuse reflection layer, 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. However, as 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. For the above reasons, 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.
发明内容Summary of the invention
本发明所要解决的技术问题在于针对现有技术的不足，提供一种波长转换装置及其制备方法，在不改变现有漫反射层厚度和漫反射粒子浓度情况下，采用亚微米漫反射粒子和纳米漫反射粒子共同组成漫反射层，实现了更高的反射率，同时漫反射层与基板能够形成良好粘接，使得波长转换装置的效率和亮度更高。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.
本发明所要解决的技术问题是通过如下技术方案实现的：The technical problem to be solved by the present invention is achieved by the following technical solutions:
本发明提供一种波长转换装置，包括基板以及设置在基板上的漫反射层，所述漫反射层包括白色漫反射粒子以及粘结剂，所述白色漫反射粒子包括主漫反射粒子和辅助粒子，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。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 μm to 10 μm, and the auxiliary particles have a particle diameter ranging from 10 nm to 100 nm.
为了使基板具有良好的导热性，所述基板为氧化铝陶瓷、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。优选地，所述基板的热导率高于10W/mK。In order to impart good thermal conductivity to the substrate, 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. Preferably, the substrate has a thermal conductivity higher than 10 W/mK.
优选地，所述粘结剂为玻璃粉、釉料或者水玻璃。Preferably, the binder is glass frit, glaze or water glass.
优选地，所述玻璃粉的粒径≤2μm。Preferably, the glass frit has a particle size of ≤ 2 μm.
优选地，所述辅助粒子为氧化铝、硫酸钡或硅酸铝。Preferably, the auxiliary particles are alumina, barium sulfate or aluminum silicate.
为提升波长转换装置的亮度和效率，经多次试验得出，所述辅助粒子在白色漫反射粒子中的含量为9wt％～33wt％，所述白色漫反射粒子与粘结剂的质量比＞1.2:1。In order to improve the brightness and efficiency of the wavelength conversion device, 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.
优选地，所述主漫反射粒子的粒径范围为0.1μm～1μm。Preferably, the main diffuse reflection particles have a particle diameter ranging from 0.1 μm to 1 μm.
本发明还提供一种波长转换装置的制备方法，所述的制备方法包括：将有机载体和如上所述的白色漫反射粒子、粘结剂混合，形成混合浆料；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;
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.
所述烧结具体为将涂覆有混合浆料的基板在60℃～150℃下预烘干，之后在700℃～1000℃下烧结。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.
综上所述，本发明在不改变现有漫反射层厚度和漫反射粒子浓度情况下，采用亚微米漫反射粒子和纳米漫反射粒子共同组成漫反射层，实现了更高的反射率，同时漫反射层与基板能够形成良好粘接，使得波长转换装置的效率和亮度更高。In summary, 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.
下面结合附图和具体实施例，对本发明的技术方案进行详细地说明。The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
附图说明DRAWINGS
图1为本发明波长转换装置的结构示意图；1 is a schematic structural view of a wavelength conversion device according to the present invention;
图2为本发明漫反射层的SEM图；2 is an SEM image of a diffuse reflection layer of the present invention;
图3为图2的局部放大图。Fig. 3 is a partial enlarged view of Fig. 2;
具体实施方式detailed description
图1为本发明波长转换装置的结构示意图；图2为本发明漫反射层的SEM图；图3为图2的局部放大图。如图1至图3所示，本发明提供一种波长转换装置，所述波长转换装置包括基板100以及设置在基板100上的漫反射层200。所述漫反射层200的厚度≤80μm，优选地，厚度≤50μm，更优选地，厚度范围为5μm～30μm。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; and FIG. 3 is a partial enlarged view of FIG. As shown in FIGS. 1 to 3, 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 μm, preferably, a thickness ≤ 50 μm, and more preferably, a thickness ranging from 5 μm to 30 μm.
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，优选地，所述基板100的热导率高于10W/mK。所述漫反射层200包括白色漫反射粒子210以及粘结剂220，所述粘结剂220为玻璃粉、釉料或者水玻璃，当选用玻璃粉作为粘结剂220时，玻璃粉的粒径≤2μm，优选地，玻璃粉的粒径≤1μm。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. Preferably, 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 μm, preferably, the glass frit has a particle diameter of ≤ 1 μm.
所述白色漫反射粒子210包括主漫反射粒子211和辅助粒子212，所述主漫反射粒子211的粒径范围为0.1μm～10μm，优选地，主漫反射粒子211的粒径范围为0.1μm～5μm，更优选地，主漫反射粒子211的粒径范围为0.1μm～1μm，更优选地，主漫反射粒子211的粒径范围为0.1μm～0.5μm。所述主漫反射粒子211为氧化铝、硫酸钡、氧化钛、氧化锌、氧化钇及氧化锆中的一种或多种，优选地，所述主漫反射粒子211包括氧化钛和氧化铝。所述辅助粒子212的粒径范围为10nm～100nm，所述辅助粒子212为氧化铝、硫酸钡或硅酸铝，优选地，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，优选地，质量比＞1.5:1，更优选地，质量比＞2:1，更优选地，质量比为3：1。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 μm to 10 μm. Preferably, the main diffuse reflection particles 211 have a particle diameter ranging from 0.1 μm. ～5 μm, more preferably, the main diffuse reflection particles 211 have a particle diameter ranging from 0.1 μm to 1 μm, and more preferably, the main diffuse reflection particles 211 have a particle diameter ranging from 0.1 μm to 0.5 μm. The main diffuse reflection particles 211 are one or more of alumina, barium sulfate, titanium oxide, zinc oxide, cerium oxide, and zirconia. Preferably, 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. Preferably, 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.
本发明还提供一种波长转换装置的制备方法：The invention also provides a preparation method of a wavelength conversion device:
将有机载体和如上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 with the white diffuse reflection particles and the binder as described above 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.
所述烧结具体为将涂覆有混合浆料的基板在60℃～150℃下预烘干，之后在700℃～1000℃下烧结。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.
具体的，在本发明的一实施例中，可以采用氧化铝陶瓷作为基板100，将粒径范围为0.2μm～0.5μm的氧化钛粒子、0.2μm～0.5μm的氧化铝粒子、0.01μm～0.1μm氧化铝粒子以及1μm的硼硅酸玻璃粉与由乙基纤维素、松油醇、丁基卡比醇、丁基卡比醇酯混合溶解形成的有机载体混合搅拌均匀形成混合浆料，将混合浆料刮涂至基板100上，于60℃～150℃下预烘干2min～60min，之后置于马弗炉中800℃～1000℃烧结2min～1h，从而在基板100上形成漫反射层200。Specifically, in an embodiment of the present invention, alumina ceramics may be used as the substrate 100, and titanium oxide particles having a particle diameter ranging from 0.2 μm to 0.5 μm, alumina particles of 0.2 μm to 0.5 μm, and 0.01 μm to 0.1 may be used. Μm alumina particles and 1 μm 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.
本发明人员研究发现，主漫反射粒子211之间需要一定的间距，过小和过大都不利于反射率的提升，间距过小，主漫反射粒子211之间由于光学阻隔作用降低反射率，过大则会形成纱窗漏光效应；且由于玻璃粉粒径较大，且含量较低，不能形成充分液相，较大玻璃熔融颗粒占据了较大空间，对反射率有不利影响；加入辅助粒子212填补了玻璃熔融液的空白，增加了白色漫反射粒子210的致密度，提升了反射率。换句话说，在亚微米漫反射粒子中加入少量的纳米粒径的漫反射粒子，能够有效地填补玻璃颗粒烧结面的反射率损失，如图2和图3所示，玻璃粉在烧结后没有形成完全熔融的流动状态，基本保持其原有粒径大小约2μm，其粒径为0.1μm～0.5μm的主漫反射粒子211粘附在玻璃粉周围，主漫反射粒子211的粒径如图3中D1所示，经测量，D1为255.44nm，由于大玻璃粉的间隔作用，主漫反射粒子211并不能完全覆盖住玻璃粉，因而留下较大的空白区域，这个空白区域正好可以被较小粒径的纳米粒子(辅助粒子212)填补，从图3中可以看出，玻璃粉表面存在大量粒径为20nm～30nm的纳米粒子，而这部分米粒子能够有效的提升其反射率，辅助粒子212的粒径如图3中D2所示，经测量，D2为23.94nm。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. As shown in Fig. 2 and Fig. 3, the glass powder is not sintered. Forming a completely molten flow state, substantially maintaining the original particle size of about 2 μm, and the main diffuse reflection particles 211 having a particle diameter of 0.1 μm to 0.5 μm 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. 3, a large number of nanoparticles having a particle diameter of 20 nm to 30 nm exist on the surface of the glass powder, and the rice particles can effectively increase the reflectance thereof. The particle size of the auxiliary particles 212 is as shown by D2 in Fig. 3, and D2 was measured to be 23.94 nm.
表1示出了纳米粒子含量对漫反射层反射率的影响，其反射率是根据蓝菲公司标准漫反射SRS-99-010为标准，采用积分球相对测试得到。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.
表1Table 1
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%
如表1所示，当辅助粒子212的含量在9wt％～33wt％范围时，反射率可以进一步提升反射率1％～2％。当含量小于9wt％时，辅助粒子212的含量不足以覆盖玻璃颗粒表面，反射率影响不大，当含量大于33wt％时，主漫反射粒子211的含量不足，因而其反射率不高。As shown in Table 1, when the content of the auxiliary particles 212 is in the range of 9 wt% to 33 wt%, the reflectance can further increase the reflectance by 1% to 2%. When the content is less than 9 wt%, the content of the auxiliary particles 212 is insufficient to cover the surface of the glass particles, and the reflectance is not greatly affected. When 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.
综上所述，本发明在不改变现有漫反射层厚度和漫反射粒子浓度情况下，采用亚微米漫反射粒子和纳米漫反射粒子共同组成漫反射层，实现了更高的反射率，同时漫反射层与基板能够形成良好粘接，使得波长转换装置的效率和亮度更高。In summary, 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.

Claims (10)

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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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