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Red light-emitting tungstate fluorescent powder

A technology of red light tungstate and phototungstate, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of staying, unsatisfactory luminescence performance, unable to replace commercial red luminescent phosphors, etc. Retrofit cost, stable physical and chemical properties, and resistance to mechanical grinding

Inactive Publication Date: 2013-09-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Eu-doped NaY(WO 4 ) 2 Artificial single crystals and powders have been reported in academic literature, but due to factors such as unsatisfactory luminescence properties, they cannot replace commercial red-emitting phosphors, so they only stay in the basic research stage and lack commercial application significance. There is no patent report on the phosphor powder developed on the basis of this tungstate

Method used

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  • Red light-emitting tungstate fluorescent powder
  • Red light-emitting tungstate fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1. Na 0.8 Li 0.2 Y 0.91 Eu 0.09 (WO 4 ) 2 , Ie x=0.09, y=0.2 phosphor synthesis

[0015] (1) Weigh 0.506g of Y according to the stoichiometric ratio 2 O 3 , 0.078g of Eu 2 O 3 , 0.209g of Na 2 CO 3 , 2.28g WO 3 And 0.036g of Li 2 CO 3 Powder, where Y 2 O 3 And Eu 2 O 3 Is 99.9%, and Na 2 CO 3 , WO 3 And Li 2 CO 3 Analytically pure

[0016] (2) Grind and mix the above raw materials in an agate mortar thoroughly. Then put it into an alumina crucible (?? 30x50mm) with a lid and put it into the SX2-6-13 box-type resistance furnace of Shanghai Yifeng Electric Furnace Co., Ltd., rising from room temperature to 1100°C at a rate of 5°C / min. After being kept for 8 hours, the product powder with white appearance was obtained after natural cooling to room temperature.

Embodiment 2

[0017] Example 2. Na 0.7 Li 0.3 Y 0.91 Eu 0.09 (WO 4 ) 2 , Ie x=0.09, y=0.3 the synthesis of phosphor

[0018] (1) Weigh 0.506g of Y according to the stoichiometric ratio 2 O 3 , 0.078g of Eu 2 O 3 , 0.183g of Na 2 CO 3 , 2.28g WO 3 And 0.054g of Li 2 CO 3 Powder, where Y 2 O 3 And Eu 2 O 3 Is 99.9%, and Na 2 CO 3 , WO 3 And Li 2 CO 3 Analytically pure

[0019] (2) Grind and mix the above raw materials in an agate mortar thoroughly. Then put it into an alumina crucible (?? 30x50mm) with a lid and put it into the SX2-6-13 box-type resistance furnace of Shanghai Yifeng Electric Furnace Co., Ltd., rising from room temperature to 1100°C at a rate of 5°C / min. After being kept for 8 hours, the product powder with white appearance was obtained after natural cooling to room temperature.

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Abstract

The invention relates to a tungstate-base red light-emitting fluorescent powder, belonging to the field of luminescent materials. The chemical formula of the fluorescent powder is Na1-yLiyY1-xEux(WO4)2, wherein X is 0.01-1, and Y is 0.01-0.5. The fluorescent powder can be prepared by a solid-phase synthesis method; and the intensity of red light emitted under the excitation of 380nm wavelength used by a blue light semiconductor chip for a commercial LED (light-emitting diode) is more than twice of commercial red powder (Eu-doped Y2O3). The fluorescent powder is suitable to be used as red powder for display devices and white light LEDs, and has favorable application prospects in white light LEDs under the excitation of blue light semiconductor chips.

Description

Technical field [0001] The invention relates to a tungstate phosphor that emits red light, and belongs to the technical field of luminescent materials. Background technique [0002] Phosphors with high color purity and high luminous intensity are key materials in the field of lighting and display. At present, there are two main types of commercial red-emitting phosphors, among which Eu-doped Y 2 O 2 S has poor chemical stability, and the SO produced 2 It is not good for the human body and pollutes the environment. Another commercial red-emitting phosphor is Y doped with Eu 2 O 3 , Although chemically stable and environmentally friendly, the high-purity Y used 2 O 3 It is expensive and lacks economy. In addition, although compared with traditional incandescent lamps, the white LED commercialized in 1997 is more energy-efficient and environmentally friendly, and is known as the green light source of the 21st century, but what it needs can be effectively excited by violet or blue s...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 雷芳李梦娜施鹰谢建军姜洪鑫
Owner SHANGHAI UNIV