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A kind of yag transparent ceramic and preparation method thereof

A technology of transparent ceramics and precipitation method, applied in the field of preparation of transparent ceramics, can solve the problems of difficult control of thickness, uneven angular distribution, short life of white LEDs, etc.

Inactive Publication Date: 2016-04-13
盐城诚赢生物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional powder-encapsulated white light LEDs use epoxy resin or silica gel to fix the blue light chip. The disadvantages of preparing white light LEO are: on the one hand, it is difficult to control the thickness of the mixed layer of phosphor powder and silica gel coated on the chip surface, and the correlated color temperature of white light ( CCT) Angular distribution is uneven, resulting in the phenomenon of blue circles and yellow circles in the outgoing white light; on the other hand, the life of white light LEDs is short and the stability is poor
Shunsuke et al. study glass ceramic phosphors, but since the glass matrix is ​​Al 2 o 3 -SiO 2 , and the traditional high-temperature solid-phase method is adopted, so the preparation temperature is as high as 1500-1650 °C

Method used

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  • A kind of yag transparent ceramic and preparation method thereof

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Embodiment 1

[0031] The mass composition of transparent ceramics is: Al 2 o 3 220g, Y 2 o 3 350g, SiO2 70g, CeO 2 15g, Pr 2 o 3 5g, Eu 2 o 3 2g, Lu 2 o 3 2g, As 2 o 3 2g, B 2 o 3 3g, GeO 2 5g, CaO0.5g. will remove SiO 2 Put the extraneous material into a ball mill, add 500ml of absolute ethanol, then ball mill for 15 hours, dry in an oven at 100°C, and sieve after grinding to obtain particles with a particle size of 1-10 microns. SiO 2 It is dispersed and mixed with other material particles obtained by ultrasonic waves, and then pressed under a pressure of 80MPa to form a plain embryo, and then the rough embryo is placed in a crucible. Heating to 1300°C with a heating rate of 20°C / min, holding for 5 hours, raising the temperature to 1520°C at a rate of 10°C / min and holding for 10 hours, then cooling naturally. Finally, the fired transparent ceramics are ground and polished to obtain a transparent ceramic product A1.

Embodiment 2

[0033] The mass composition of transparent ceramics is: Al 2 o 3 300g, Y 2 o 3 350g, SiO 2 60g, CeO 2 20g, Pr 2 o 3 10g, Eu 2 o 3 5g, Lu 2 o 3 4g, As 2 o 3 5g, B 2 o 3 5g, GeO 2 10g, CaO1g. will remove SiO 2 Put the extraneous material into a ball mill, add 500ml of absolute ethanol, then ball mill for 15 hours, dry in an oven at 100°C, and sieve after grinding to obtain particles with a particle size of 1-10 microns. SiO 2 And the obtained other material particles are ultrasonically dispersed and pulverized, and then pressed under a pressure of 100MPa to form a plain embryo, and then the rough embryo is placed in a crucible. Heating to 1250°C with a heating rate of 20°C / min, holding for 5 hours, raising the temperature to 1550°C at a rate of 10°C / min and holding for 10 hours, then cooling naturally. Finally, the fired transparent ceramics are ground and polished to obtain a transparent ceramic product A2.

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Abstract

An improved YAG transparent ceramic is disclosed. the YAG transparent ceramic is formed by sintering the following raw materials, by weight, 220-300 parts of Al2O3, 300-380 parts of Y2O3, 60-75 parts of SiO2, 15-20 parts of CeO2, 5-10 parts of Pr2O3, 2-5 parts of Eu2O3, 2-4 parts of Lu2O3, 2-5 parts of As2O3, 3-5 parts of B2O3, 5-15 parts of GeO2 and 0.5-1 part of CaO. Purity of the raw materials is all above 99.99 wt%. Thickness of the transparent ceramic is 0.2-0.6mm. In comparison with the prior art, the transparent ceramic is excited by blue LED, high-quality white light can be generated, and the YAG transparent ceramic has characteristics of high color rendering index and soft color temperature.

Description

technical field [0001] The invention relates to a method for preparing transparent ceramics used in white light LEDs, in particular to the improvement of the method for preparing YAG (yttrium aluminum garnet) transparent ceramic materials. Background technique [0002] White light LED uses blue light LED to excite the yellow phosphor coating layer to emit yellow light, and then the blue light and yellow light are combined to emit white light. This white LED has the characteristics of long life, green and environmental protection, and contains huge market potential and application prospects. [0003] The main component of yellow phosphor is cerium-doped yttrium aluminum garnet (YAG:Ce). Traditional powder-encapsulated white light LEDs use epoxy resin or silica gel to fix the blue light chip. The disadvantages of preparing white light LEO are: on the one hand, it is difficult to control the thickness of the mixed layer of phosphor powder and silica gel coated on the chip surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/505C04B35/622
CPCC04B35/44C04B35/505C04B35/622C04B2235/3208C04B2235/3224C04B2235/3409C04B2235/5454C04B2235/656C04B2235/6567
Inventor 俞立军
Owner 盐城诚赢生物科技股份有限公司