Fluorescent ceramic used for illumination or display, and preparation method thereof

A technology of fluorescent ceramics and fluorescent powder, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of low cost, decreased luminous efficiency, yellowing, etc., and achieve the effect of stable physical and chemical properties

Inactive Publication Date: 2017-06-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This form is simple in process and low in cost, but there are still many unsolvable problems. With the increase of power energy density of semiconductor chips, the energy of emitted light per unit area increases. The light attenuation of the powder is very serious. At the same time, as a polymer material, the organic resin material will depolymerize the molecular chain in a long-term high-energy and high-temperature environment, resulting in yellowing, resulting in a decrease in luminous efficiency. Therefore, a physicochemical Fluorescent materials with stable properties and resistance to continuous excitation of high energy density light are the key link to realize ultra-high power white LED lighting or display

Method used

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  • Fluorescent ceramic used for illumination or display, and preparation method thereof

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Effect test

Embodiment 1

[0018] A. Preparation of aluminosilicate phosphors: according to the chemical formula (Ca 0.3 Mg 0.7 ) 0.8 Al 2 Si 2 O 8 : 0.2Eu 2+ The ratio of each element in the MgCO 3 , CaCO 3 , Al 2 O 3 , SiO 2 and Eu 2 O 3 As a raw material, the weighed raw materials are mixed uniformly, and ball-milling is carried out. The ball-milling time is 3 hours, and the ball-milling speed is 120 rpm; High temperature calcination is carried out, the temperature is 1250 ° C, and the time is 8.5 hours. After the calcination is completed, when the temperature of the high temperature solid-phase furnace is lowered to room temperature, the furnace is opened, the materials are taken out, pulverized and sieved, and the desired aluminosilicate fluorescence can be prepared. pink;

[0019] B. Preparation of fluorescent ceramics: According to the mass ratio of ceramic raw material powder, sintering aids and aluminosilicate phosphors in fluorescent ceramics, respectively 75%, 3% and 22%, the mat...

Embodiment 2

[0021] A. Preparation of aluminosilicate phosphors: according to the chemical formula (Ca 0.4 Sr 0.6 ) 0.5 Al 2 Si 2 O 8 : 0.4Eu 2+ , 0.1Ce 3+ The ratio of each element in the SrCO is weighed 3 , CaCO 3 , Al 2 O 3 , SiO 2 , Eu 2 O 3 and CeO 2 As raw materials, the weighed raw materials were mixed uniformly, and ball milling was carried out. The ball milling time was 3.5 hours, and the ball milling speed was 120 rpm; High temperature calcination is carried out, the temperature is 1150 ° C, and the time is 9.5 hours. After the calcination is completed, when the temperature of the high-temperature solid-phase furnace is lowered to room temperature, the furnace is opened, the materials are taken out, pulverized and sieved, and the desired aluminosilicate fluorescence can be prepared. pink;

[0022] B. Preparation of fluorescent ceramics: According to the mass ratio of ceramic raw material powder, sintering aid and aluminosilicate fluorescent powder in fluorescent ce...

Embodiment 3

[0024] A. Preparation of aluminosilicate phosphors: according to the chemical formula (Ca 0.9 Sr 0.1 ) 0.3 Al 2 Si 2 O 8 : 0.25Eu 2+ , 0.45Ce 3+ The ratio of each element in the SrCO is weighed 3 , CaCO 3 , Al 2 O 3 , SiO 2 , Eu 2 O 3 and CeO 2As raw materials, the weighed raw materials were mixed uniformly, and then ball-milled. The ball-milling time was 3.5 hours, and the ball-milling speed was 120 rpm; 2 / H 2 High-temperature calcination is carried out in the formed reducing atmosphere, the temperature is 1350 ° C, and the time is 8 hours. After the calcination is completed, when the temperature of the high-temperature solid-phase furnace is lowered to room temperature, the furnace is opened, and the material is taken out, crushed and sieved to prepare the required aluminosilicate phosphors;

[0025] B. Preparation of fluorescent ceramics: According to the mass ratio of ceramic raw material powder, sintering aids and aluminosilicate phosphors in fluorescent ...

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Abstract

The invention discloses fluorescent ceramic used for illumination or display, and a preparation method thereof. The fluorescent ceramic comprises ceramic raw material powder, sintering accessory ingredient and aluminosilicate fluorescent powder, wherein the chemical formula of the aluminosilicate fluorescent powder is (Ca1-xMx)1-y-zAl2Si2O8:yEu<2+>,zr, wherein an element R is one of Mg, Sr and Ba, R is one of Ce<3+>, Mn<4+>, Dy<3+> and Tb<3+>, x, y and z are molar coefficients, x is greater than 0.01 and less than 1, y is greater than or equal to 0.2 and less than or equal to 0.7, z is greater than or equal to 0 and less than or equal to 0.6, and y+z is less than 1. The fluorescent ceramic is mainly prepared through a high-temperature calcination technology, and the high-temperature calcination technology specifically comprises the following steps: carrying out ball milling; after the ball milling is finished, carrying out dry-pressing molding, cold isostatic pressing molding, vacuum calcination, hot isostatic pressure calcination and annealing processing. The fluorescent ceramic prepared with the preparation method has the advantages of high excitation and emission efficiency, stable physico-chemical property and good application prospect in an illumination or display field, and is suitable for the continuous excitation of high-energy density light.

Description

technical field [0001] The invention relates to a fluorescent ceramic for lighting or display, and provides a preparation method of the fluorescent ceramic, which belongs to the field of luminescent materials. Background technique [0002] Due to the advantages of high luminous efficiency, long life, energy saving, environmental protection, safety and reliability, white LEDs are gradually occupying market share in lighting, display and other fields. The main form of realizing white light LED is semiconductor chip excitation phosphor material. The specific process is to mix and degas the phosphor material with organic resin material (such as silicone resin, epoxy resin, etc.) After curing and molding, the white LED can be obtained. This form has a simple process and low cost, but there are also many unsolvable problems. With the increase of the power energy density of the semiconductor chip, the emitted light energy per unit area increases. For example, when the laser is las...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443C04B35/505C04B35/581C04B35/582C04B35/58C04B35/645C04B35/626C09K11/64
Inventor 卓宁泽王海波刘光熙
Owner NANJING UNIV OF TECH
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