A preparation method of polycrystalline bulk material for optical wavelength conversion

Abstract

A method for preparing a polycrystalline block material for light wavelength conversion, characterized in that: comprising the following steps: 1) taking aluminum oxide, yttrium oxide, and cerium oxide as raw materials according to the stoichiometric ratio of the garnet structure, weighing according to Raw materials: alcohol: ball mass ratio is 1:1.5:5, ball milling and mixing evenly, drying to obtain the initial raw material powder; 2) the initial raw material powder is sieved with a sieve to obtain coarse and fine powders with different particle sizes, After sieving, according to the combination of the fine-grained powder and the coarse-grained powder in a certain proportion, the molding powder is obtained; 3) the molding powder is firstly pressed into a block by dry pressing and then cold isostatic pressing, Obtaining a bulk green body; 4) adding a sintering aid to the block green body in a vacuum atmosphere, and sintering at a low temperature to finally obtain a polycrystalline block material with submicron grains. The invention can improve the light extraction efficiency of the polycrystalline block material with light wavelength conversion, makes the process relatively simple, effectively controls the cost, and is beneficial to large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of polycrystalline bulk materials, in particular to a preparation method of polycrystalline bulk materials used for light wavelength conversion. Background technique [0002] The so-called polycrystalline bulk materials, such as ceramics and glass, have a high internal refractive index that leads to a serious problem: when light enters the material from the air, total reflection occurs due to changes in the refractive index, and the light from the inside of the material The efficiency (escape rate) to the air is very low, and more light escapes from the side after total reflection, resulting in the optical waveguide phenomenon. The above phenomenon can be explained in the field of white light semiconductor lighting, for example: use blue light semiconductor light source to excite fluorescent materials with different emission bands, convert them into green light, yellow light, red light, etc., blue light...

AI Technical Summary

Problems solved by technology

[0002] The so-called polycrystalline bulk materials, such as ceramics and glass, have a high internal refractive index that leads to a serious problem: when light enters the material from the air, total reflection occurs due to changes in the refractive index, and the light from the inside of the material The efficiency of exiting into the air (escape rate) is very low, and more light escapes from the side after total reflection, resulting in the phenomenon of optical waveguide

[0006] 1: The improvement effect of this method is limited;

[0007] 2: Manufactured from a plane to a curved surface, the process is complex, the cycle is long, and the material loss rate is high, the production cost is greatly increased, which is not conducive to large-scale industrial production and application

[0010] The biggest disadvantage of constructing photonic crystals to control the microstructure is that the demand for equipment is high, the process is complicated, and the production cost is greatly increased, which is not conducive to industrial production and application.

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