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Synthesis of YAG luminescent material for white LED

A technology of yttrium aluminum garnet and luminescent material, which is applied in the synthesis field of yttrium aluminum garnet luminescent material for white light LED, and achieves the effects of good powder fluidity, good growth and low attenuation characteristics

Inactive Publication Date: 2006-08-16
常熟市江南荧光材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the light-emitting diodes and light-emitting materials YAG used to package white LEDs rely on imports. The production of some white LEDs in China is still mainly imported and assembled, and the light-emitting materials used in white LEDs are still mainly dependent on imports. At present, the luminous intensity and decay life of luminescent materials are analyzed. The luminous intensity of YAG luminescent materials needs to be further improved, and the decay life needs to be further strengthened.

Method used

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  • Synthesis of YAG luminescent material for white LED

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1: the composition of matter: (Y 0.95 Ce 0.05 ) 3 Al 5 o 12 ;

[0018] Components: 15.307g of alumina, 19.619g of yttrium oxide, 1.582g of cerium oxide, 0.18g of boric acid, 0.54g of barium fluoride;

[0019] Thoroughly mix the above components evenly, among which boric acid and barium fluoride are used as flux, and are mixed and ground for 1.5 hours in a corundum ball mill jar equipped with agate balls with a diameter of 10mm, and the mixed and ground oxides are put into a corundum crucible Carry out burning for 4 hours in a high-temperature oxidizing atmosphere, and the temperature is controlled at 1500°C. The burned product is crushed and passed through a 250-mesh sieve, followed by pickling treatment, and the product after cleaning and sieving with 0.1% nitric acid solution Suction filtration until neutral, drying at 100°C and passing through a 150-mesh sieve, again put the sieved product into a corundum crucible, and burn in a nitrogen-hydrogen (5% ...

Embodiment 2

[0020] Embodiment 2: the composition of matter: (Y 0.75 Tb 0.2 Ce 0.05 ) 3 Al 5 o 12 ;

[0021] Components: 14.474g of alumina, 14.151g of yttrium oxide, 1.437g of cerium oxide, 6.336g of terbium oxide, 0.252g of boric acid, 0.360g of strontium fluoride;

[0022] The above components were fully mixed according to Example 1, and burned twice as described in Example 1, the temperature was 1400 ° C and 1200 ° C, the time was 3 hours and 5 hours, pickling treatment and For the further treatment of the fired product, the concentration of the nitric acid solution is 0.5%, and the color of the obtained luminescent substance powder is dark yellow. The emission spectrum of the luminescent substance is shown in the accompanying drawing.

Embodiment 3

[0023] Embodiment 3: the composition of matter: (Y 0.75 Gd 0.2 Ce 0.05 ) 3 Al 5 o 12 ;

[0024] Components: 14.551g of alumina, 14.226g of yttrium oxide, 6.177g of gadolinium oxide, 1.444g of cerium oxide, 0.216g of boric acid, 0.180g of lithium chloride;

[0025] The above-mentioned components were fully mixed uniformly as described in Example 1, and burned twice as described in Example 1, the temperature was 1600 ° C and 1500 ° C, and the time was 5 hours and 4 hours respectively, pickling treatment and For the further treatment of the fired product, the concentration of the nitric acid solution is 1%, and the color of the obtained luminescent substance powder is yellow. The emission spectrum of the luminescent substance is shown in the accompanying drawing.

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Abstract

Synthesis of yttrium aluminum garnet luminescent material for white light LED is carried out by proportioning by chemical component formula (Y1-x-yMyCex) 3Al5O12, weighing raw material, mixing with flux additive, putting into corundum crucible, firing in oxidation atmosphere furnace, crushing, mesh screening, acid washing by dilute nitric acid solution to indifference, extraction filtering, drying powders, firing the powder at reduction atmosphere, and screen grading to obtain the final product. It uses two kinds or above of boric acid, barium fluoride, strontium fluoride, lithium chloride or lithium fluoride as composite flux and mixes with other rare earth or metal oxide. It has excellent single crystal particular growth, powder fluidity, better brightness and low decrement.

Description

1. Technical field [0001] The invention relates to a method for synthesizing a luminescent material, in particular to a method for synthesizing a yttrium aluminum garnet luminescent material for a white light LED. 2. Background technology: [0002] At present, white LEDs are mainly blue LEDs plus yttrium aluminum garnet (YAG) phosphor, In x Ga 1-x N / YAG: Ce is coated with a layer of YAG fluorescent material with InGaN blue light grains with a wavelength of 450nm to 470nm. The blue light emitted by the LED with a wavelength of 465nm is used as the excitation light to excite the YAG phosphor, and emits yellow fluorescence with a wavelength of 550nm to 570nm complementary to the blue light, and then uses the lens principle to mix the complementary yellow light and blue light to obtain the naked eye desired white light. At present, most of the light-emitting diodes and YAG light-emitting materials used to package white light LEDs rely on imports. Some domestic white light LED...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCY02B20/181Y02B20/00
Inventor 陆正发曾庆云王丽君夏国文胡程杨红
Owner 常熟市江南荧光材料有限公司
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