Apatite-structure fluorescent powder capable of exciting blue green light and preparation method thereof

A technology of apatite and phosphor, applied in the field of phosphor with apatite structure and its preparation, can solve the problems of high color temperature, lack of red light, low light efficiency, etc., and achieve simple preparation method, no pollution to the environment, and easy operation Effect

Inactive Publication Date: 2014-04-23
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The white light LED realized by this method has the advantages of low cost and easy production, but the light efficiency is low, and the uniformity of light emission is not good. It is very necessary to meet the application of white light LED

Method used

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  • Apatite-structure fluorescent powder capable of exciting blue green light and preparation method thereof
  • Apatite-structure fluorescent powder capable of exciting blue green light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The material composition is Sr 3.5 Y 6.45 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+

[0019] Press Sr 3.5 Y 6.45 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ In the molar ratio of each element, accurately weigh 0.5gSrCO 3 , 0.7047g Y 2 o 3 , 0.1917g (NH 4 ) 2 HPO 4 , 0.2616g SiO 2 and 0.0083g CeO 2 High-purity powder raw materials are placed in an agate mortar and ground for about 30 minutes to fully mix the raw materials evenly. Transfer the mixed raw materials to the alumina crucible, add and nest the small corundum crucible in the large crucible with carbon powder, cover it and place it in a high-temperature reaction furnace for sintering at 1500°C for 5 hours, take it out after natural cooling, and grind again In about 15 minutes, a single-phase Sr 3.5 Y 6.45 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ Phosphor.

Embodiment 2

[0020] Embodiment 2: The material composition is Sr 3.5 Y 6.4 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ , 0.05Tb 3+

[0021] Press Sr 3.5 Y 6.4 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ , 0.05Tb 3+ In the molar ratio of each element, accurately weigh 0.5g SrCO 3 , 0.6992g Y 2 o 3 , 0.1917g (NH 4 ) 2 HPO 4 , 0.2616g Si0 2 , 0.0090g Tb 4 o 7 and 0.0083g CeO 2High-purity powder raw materials are placed in an agate mortar and ground for about 30 minutes to fully mix the raw materials evenly. Transfer the mixed raw materials to the alumina crucible, add and nest the small corundum crucible in the large crucible with carbon powder, cover it and place it in a high-temperature reaction furnace for sintering at 1500°C for 5 hours, take it out after natural cooling, and grind again In about 15 minutes, a single-phase Sr 3.5 Y 6.4 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ , 0.05Tb 3+ Phosphor.

Embodiment 3

[0022] Embodiment 3: The material composition is Sr 3.5 Y 6.3 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ , 0.15Tb 3+

[0023] Press Sr 3.5 Y 6.3 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ , 0.15Tb 3+ In the molar ratio of each element, accurately weigh 0.5g SrCO 3 , 0.6883g Y 2 o 3 , 0.1917g (NH 4 ) 2 HPO 4 , 0.2616g SiO 2 , 0.0271g Tb 4 o 7 and 0.0083g CeO 2 High-purity powder raw materials are placed in an agate mortar and ground for about 30 minutes to fully mix the raw materials evenly. Transfer the mixed raw materials to the alumina crucible, add and nest the small corundum crucible in the large crucible with carbon powder, cover it and place it in a high-temperature reaction furnace for sintering at 1500°C for 5 hours, take it out after natural cooling, and grind again In about 15 minutes, a single-phase Sr 3.5 Y 6.3 o 2 (PO 4 ) 1.5 (SiO 4 ) 4.5 : 0.05Ce 3+ , 0.15Tb 3+ Phosphor.

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Abstract

The invention relates to apatite-structure fluorescent powder capable of exciting blue green light and a preparation method thereof. The chemical composition formula of the fluorophor is Sr3.5Y6.5-x-yO2(PO4)1.5(SiO4)4.5:xCe<3+>,yTb<3+>, (wherein x and y are respectively the mole percentage of rare earth ions Ce<3+> and Tb<3+> mixed in matrix material Sr3.5Y0.5O2(PO4)1.5(SiO4)4.5, 0.005 <= x <=0.500, and 0.000 <= y <=0.500). An oxide, a hydroxide or a corresponding salt of the structure formula is selected as a raw material for calcining for 3-8h at 1300-1500 DEG C under a reducing atmosphere to obtain the luminescent materials by a solid phase synthesis method. The fluorophor can match with a near ultraviolet light emitting diode, and is applied to the three primary color white light LED devices. In addition, the fluorescent powder prepared by the preparation method is high in purity, easy in operation, and free of pollution to the environment.

Description

technical field [0001] The invention relates to an apatite structure fluorescent powder capable of exciting blue-green light and a preparation method thereof Background technique [0002] After the white light-emitting diode (LED) was obtained in 1996 with YAG yellow phosphor and blue Ga(In)N package, the development of white LED has attracted the attention of many researchers. Among various methods for realizing white light LED, phosphor converted w-LED (pc-LED) is a method that has been applied and has potential. The luminescence principle of pc-LED is: under the excitation of low-voltage direct current, the Ga(In)N chip emits blue light (~460nm) or near ultraviolet light (~395nm), which excites the phosphor powder coated on the chip to emit visible light, and Mixed to form white light. Using Ga(In)N-based blue light-emitting diodes and yellow-emitting YAG: Ce 3+ The white light diodes made have been commercialized and successfully applied in people's real life. The wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
Inventor 廖立兵刘海坤夏志国张园园
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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