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Double-layer YAG:Ce/(Gd,Y)AG:Ce composite transparent ceramic phosphor for white light LED packaging, and preparation method thereof

A technology of LED encapsulation and transparent ceramics, applied in ceramic layered products, chemical instruments and methods, energy-saving lighting, etc., can solve the problems of reducing white light luminous efficiency, low color rendering index, lack of red light, etc., and achieve high optical transmission The effect of high efficiency, good repeatability and simple process

Active Publication Date: 2015-03-25
中科西卡思(苏州)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another problem with the current commercial YAG:Ce powder is: the lack of red light in the luminescence, resulting in high color temperature and low color rendering index
But Gd 3+ The incorporation will reduce the luminous efficiency of white light

Method used

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  • Double-layer YAG:Ce/(Gd,Y)AG:Ce composite transparent ceramic phosphor for white light LED packaging, and preparation method thereof
  • Double-layer YAG:Ce/(Gd,Y)AG:Ce composite transparent ceramic phosphor for white light LED packaging, and preparation method thereof

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Experimental program
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preparation example Construction

[0037] Another aspect of the present invention provides a preparation method of the composite transparent ceramic phosphor. As an example, the following steps may be included.

[0038] (1) Preparation of raw material mixed powder.

[0039] In one example, the raw material mixed powder can be prepared by a solid phase method. Specifically, using yttrium oxide (Y 2 o 3 ), alumina (Al 2 o 3 ), gadolinium oxide (Gd 2 o 3 ), cerium oxide (CeO 2 ) as raw material, according to (Ce x Y 1-x ) 3 Al 5 o 12 and (Ce y Gd z Y 1-y-z ) 3 Al 5 o 12 (where 0.0005≤x≤0.05, 0.0005≤y≤0.05, 0.25≤z≤0.75) composition Accurately weigh two kinds of powder raw materials, use absolute ethanol or deionized water as the dispersion medium to carry out wet ball milling and mix evenly, ball milling The rotation speed can be 80-200rmp / min, and the ball milling time can be 5-12 hours; then the mixed powders are dried and sieved to obtain YAG:Ce powder and (Gd,Y)AG:Ce powder. In order to remo...

Embodiment 1

[0050] Using yttrium oxide (Y 2 o 3 ), alumina (Al 2 o 3 ), gadolinium oxide (Gd 2 o 3 ), cerium oxide (CeO 2 ) as raw material, according to (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Composition Accurately weigh 60g of each of the two powder materials, and then use absolute ethanol as the dispersion medium for ball milling and mixing. After ball milling for a certain period of time, the two powders are dried, sieved, and calcined at 600°C for 4 hours; It was pressed into tablets, and subjected to 200MPa cold isostatic pressing to form a green body; then it was put into a vacuum or hot-pressed sintering furnace and sintered at 1780 ° C and 1720 ° C for 20 hours, so as to obtain (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Transparent ceramics, the obtained two transparent ceramic materials are polished to obtain ceramics with high optical quality. The lower layer (Ce 0.001 Gd 0.50 Y ...

Embodiment 2

[0052] For (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Holding temperature is 1780 ℃ and 1720 ℃ respectively, and holding time is 10 hours, and other conditions are the same as embodiment 1, can obtain equally (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 and (Ce 0.001 Gd 0.25 Y 0.749 ) 3 Al 5 o 12 Transparent ceramic. The lower layer (Ce 0.001 Gd 0.50 Y 0.449 ) 3 Al 5 o 12 The transparent ceramic is ground and polished to 0.3mm, the upper layer (Ce 0.001 Y 0.999 ) 3 Al 5 o 12 The transparent ceramics are ground and polished to 0.3 mm, and their composite structure is obtained by adding commercial silica gel to two ceramic sheets. Under the excitation of 465nm blue light, high-quality white light with soft color and high luminous efficiency can be obtained. The color temperature of this composite transparent ceramic phosphor is 4299K and the luminous efficiency is 131lm / w when it is excited by an 80mA blue light chip at room te...

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Abstract

The present invention relates to a double-layer YAG:Ce / (Gd,Y)AG:Ce composite transparent ceramic phosphor for white light LED packaging, and a preparation method thereof. The composite transparent ceramic phosphor comprises two laminated transparent ceramic layers, wherein the chemical composition of the first transparent ceramic layer is (CexY1-x)3Al5O12, x is more than or equal to 0.0005 and is less than or equal to 0.05, the chemical composition of the second transparent ceramic layer is (CeyGdzY1-y-z)3Al5O12, y is more than or equal to 0.0005 and is less than or equal to 0.05, and z is more than or equal to 0.25 and is less than or equal to 0.75. According to the present invention, under the excitation of the blue light emitted by the LED chip and having the wavelength of about 465 nm, the cerium-yttrium-aluminum-doped garnet (YAG:Ce) transparent ceramic can emit the wide spectrum yellow light with the peak value of 530 nm, and the cerium-gadolinium-yttrium-aluminum-doped garnet ((Gd,Y)AG:Ce) transparent ceramic can emit the red yellow light with the wavelength of close to 580 nm, such that the white light spectrum with the sufficient red light component can be obtained through the compounding so as to effectively improve the LED luminescence color temperature while obtain the high luminous efficiency.

Description

technical field [0001] The invention relates to the preparation of double-layer transparent ceramic phosphors, such as the preparation of YAG:Ce and (Gd,Y)AG:Ce double-layer transparent ceramics. The light efficiency of the transparent ceramics obtained by vacuum sintering technology reaches the commercial level. The phosphor material has great potential application value and can be used in high-power lighting devices such as city lighting street lamps. In addition to being suitable for white LED fluorescent materials, it can also be used as a scintillation material for high-performance positron annihilation tomography (PET) as a detector material, and can also be used in nuclear medical imaging (CT, SPECT), oil well drilling, and high-energy physics. , nuclear physics, safety inspection, environmental inspection, etc. It belongs to the field of transparent ceramics. Background technique [0002] White light semiconductor lighting (light-emitting diode, referred to as LED)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50B32B18/00
CPCY02B20/00
Inventor 胡辰石云姜本学李江刘文斌寇华敏潘裕柏冯锡琪郭景坤
Owner 中科西卡思(苏州)科技发展有限公司
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