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YAG transparent ceramic for white light LED lamps and preparation method thereof

A technology of transparent ceramics and LED lamps, which is applied in the field of transparent ceramics, YAG transparent ceramic materials for white LEDs and its preparation, and can solve the problems of difficult control of thickness, high preparation temperature, and short life of white LEDs.

Inactive Publication Date: 2014-08-27
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 and others studied glass-ceramic phosphors, but since the glass matrix is ​​Al2O3-SiO2, and the traditional high-temperature solid-state method is used, the preparation temperature is as high as 1500-1650 °C

Method used

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  • YAG transparent ceramic for white light LED lamps and preparation method thereof

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Embodiment 1

[0029] The mass composition of transparent ceramics is: Al 2 o 3 280 copies, Y 2 o 3 360 parts, SiO 2 65 parts, CeO 2 20 copies, PR 2 o 3 10 parts, Eu 2 o 3 5 copies, Lu 2 o 3 4 parts, LiF 2 parts, B 2 o 3 5 parts, 5 parts of SiC, 1 part of CaO0. Pre-mix the above raw materials, put them into a ball mill, add 500ml of absolute ethanol, then ball mill for 10 hours, dry in an oven at 100°C, and pass through a 600-mesh sieve after grinding. Then the plain embryo is pressed under 80MPa pressure, and then the rough embryo is placed in the crucible. Heating to 1250°C with a heating rate of 20°C / min, keeping it warm for 7 hours, continuing to heat up to 1520°C at a rate of 10°C / min and keeping it warm for 12 hours, then cooling naturally. Finally, the fired transparent ceramics are ground and polished to obtain a transparent ceramic product A1.

Embodiment 2

[0031] The mass composition of transparent ceramics is: Al 2 o 3260 copies, Y 2 o 3 320 parts, SiO 2 70 parts, CeO 2 15 copies, PR 2 o 3 5 parts, Eu 2 o 3 2 copies, Lu 2 o 3 2 parts, LiF 1 part, B 2 o 3 3 parts, SiC 3 parts, CaO 0.5 parts. Pre-mix the above raw materials, put them into a ball mill, add 500ml of absolute ethanol, then ball mill for 10 hours, dry in an oven at 100°C, and pass through a 600-mesh sieve after grinding. Then the plain embryo is pressed under 100MPa pressure, and then the rough embryo is placed in the crucible. Heating to 1300°C with a heating rate of 20°C / min, keeping it warm for 10 hours, continuing to heat up to 1580°C at a rate of 10°C / min and keeping it warm for 15 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

A YAG transparent ceramic for white light LED lamps. Sintering raw materials comprise, 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, 1-2 parts of LiF, 3-5 parts of B2O3, 3-5 parts of SiC, and 0.5-1 part of CaO. The purity of all the raw materials is above 99.99 wt%. The transparent ceramic has a light transmittance in the visible light region of up to 65%-75%, and has a color temperature of 4000-5000 k. Compared with the prior art, the transparent ceramic is improved in aspects of shrinkage percentage, light transmittance, color rendering index, and color temperature, and has the characteristics of high thermal conductivity, good chemical stability, long service life, and high luminous efficiency.

Description

technical field [0001] The invention relates to a transparent ceramic, in particular to a YAG (yttrium aluminum garnet) transparent ceramic material for white light LEDs and a preparation method thereof, belonging to the technical field of preparation of special optical functional ceramics. Background technique [0002] Since the advent of white light LED, it has been praised as the fourth generation of lighting source after incandescent lamp, fluorescent lamp and gas discharge because of its long service life, high efficiency and energy saving, and environmental protection. It is widely used in LCD, mobile phones, digital cameras, etc. field. In recent years, with the rapid development of the semiconductor lighting industry dominated by white LEDs, white LEDs have shown huge market potential and application prospects in solid-state lighting, which has attracted great attention from governments, companies and scientific research institutes. Special institutions have been se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/505C04B35/622
Inventor 俞立军
Owner 盐城诚赢生物科技股份有限公司
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