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A kind of preparation method of sialon transparent ceramic phosphor

A technology of transparent ceramics and phosphors, which is applied in the field of preparation of SiAlON transparent ceramic phosphors, can solve the problems of decreased phosphor efficiency, blue light spots, and low light extraction efficiency, and achieve the effect of improving light efficiency and stability

Active Publication Date: 2017-06-16
苏州辉弘同创材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a temperature will cause the efficiency of the phosphor to drop by 20-30%, resulting in a shift in the color temperature and color coordinates of the light source.
At the same time, it also affects the light efficiency and stability of the LED light source.
The yttrium aluminum garnet (YAG) phosphor will degrade at a temperature above 120°C. At the same time, because the coated phosphor material is a non-transparent material, scattering and absorption will occur when the light emitted by the blue light or ultraviolet chip passes through. The light extraction efficiency is not high; at the same time, due to the uneven coating thickness, it will seriously affect its light spot and white light color temperature
For example, problems such as yellow aperture, blue light spot, and inconsistent color temperature of white light caused by uneven coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to xRe: M V+ y Si 12-(m+n) al m+m o n N 16-n (wherein m=n=1.0, x=0.1, M=Y, Re=Eu) stoichiometric ratio, with Si 3 N 4 、Al 2 o 3 , AlN, Y 2 o 3 、Eu 2 o 3 As raw material, based on the total amount of all raw materials, add 3wt% dispersant fish oil, 30wt% xylene and 40%wt absolute ethanol (liquid medium) ball mill, and 200wt% Si 3 N 4 Put the balls into a polytetrafluoro tank for ball milling for 20 hours, then add 8wt% PVB to continue ball milling for 15 hours;

[0027] (2) tape-casting the slurry obtained in step (1) to obtain a single-layer fluorescent ceramic green body;

[0028] (3) After drying the green body obtained in step (2) in an oven at 120°C for 24 hours, degrease at 700°C, place it in a boron nitride crucible and sinter it with nitrogen in a carbon furnace, keep it at 1900°C for 3 hours, and then cool it with the furnace to obtain SiAlON Transparent ceramic.

[0029] (4) After polishing the SiAlON transparent ceramic obtained i...

Embodiment 2

[0032] (1) According to M V+ y Si 12-(m+n) al m+m o n N 16-n (wherein m=n=1.0, x=0.1, M=Y) stoichiometric ratio, with Si 3 N 4 、Al 2 o 3 , AlN, Y 2 o 3 Be raw material, other weighing and ball milling are identical with example 1;

[0033] (2) Tape-cast the slurry obtained in step (1) to obtain a single-layer non-fluorescent ceramic green body, and superpose the non-fluorescent ceramic green body with the single-layer fluorescent ceramic green body obtained in step (2) of Example 1 to obtain Fluorescent ceramic green body with composite structure;

[0034] (3) The other steps were the same as in Example 1 to obtain a Eu:SiAlON / SiAlON transparent ceramic phosphor with a composite structure.

Embodiment 3

[0036] (1) According to xRe:M V+ y Si 12-(m+n) al m+m o n N 16-n (wherein m=n=1.0, x=0.1, M=Y, Re=Eu) stoichiometric ratio, with Si 3 N 4 、Al 2 o 3 , AlN, Y 2 o 3 、Eu 2 o 3 As raw material, based on the total amount of all raw materials, add 0.5wt% fish oil, 0.5wt% PVB, and 100%wt absolute ethanol ball mill, and 200wt% Si 3 N 4 Put the ball into a polytetrafluoro tank and mill for 20 hours;

[0037] (2) The slurry obtained in step (1) is sprayed and granulated, and the particle size of the obtained ceramic powder is about 30um, and then dry-pressed with a pressure of 50MPa on a tablet press to obtain a single-layer fluorescent ceramic green body;

[0038] (3) The green body obtained in the step (2) was degreased at 700° C., and the other steps were the same as in Example 1 to obtain a Eu:SiAlON transparent ceramic phosphor.

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Abstract

The present invention relates to a kind of preparation method of SiAlON transparent ceramic phosphor; 3 N 4 、Al 2 o 3 , AlN, Re 2 o 3 As raw materials, add binder, dispersant, liquid medium and grinding balls into the ball mill tank and mix evenly; adopt different molding methods to obtain green body according to the requirements of LED packaging for phosphor packaging structure; degrease the formed green body and place Sintering in a carbon furnace with nitrogen gas; annealing and polishing the sintered ceramics to obtain SiAlON transparent ceramic phosphors. The SiAlON transparent ceramic phosphor provided by the invention can emit one or more of yellow light, green light and red light, and can significantly improve light efficiency and color rendering index when used in white light LED packaging.

Description

technical field [0001] The invention relates to a preparation method of a SiAlON transparent ceramic phosphor, in particular to a preparation method of a SiAlON transparent ceramic phosphor used for a warm-color-temperature white LED package light source, and belongs to the technical field of preparation of transparent fluorescent ceramics. Background technique [0002] Semiconductor lighting white light LED, as a new generation of lighting technology, has the obvious advantages of high luminous efficiency, green energy saving, and has broad application prospects in various lighting fields. Governments of various countries attach great importance to it and have issued important policies to support it. [0003] White light is a kind of mixed light, which can be realized by three methods: (1) blue LED chip with yellow light fluorescent material or red light fluorescent material; (2) blue LED chip with green light and red light fluorescent material; (3) purple light And the ult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/599C04B35/622
Inventor 胡宁宁黄运铨
Owner 苏州辉弘同创材料科技有限公司