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Phosphor excited at ultraviolet 250-290 nm and near ultraviolet 396 nm and preparation method thereof

A phosphor and near-ultraviolet technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of lack of and can not effectively improve the color rendering index of energy-saving lamps and white LEDs assembled, and achieves simple preparation method, excitation Wide wavelength range and good luminous effect

Inactive Publication Date: 2012-01-18
GANZHOU ZHANHAI IND & TRADING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of deep red light above 650nm, it cannot effectively improve the color rendering index of assembled energy-saving lamps and white LEDs

Method used

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  • Phosphor excited at ultraviolet 250-290 nm and near ultraviolet 396 nm and preparation method thereof
  • Phosphor excited at ultraviolet 250-290 nm and near ultraviolet 396 nm and preparation method thereof
  • Phosphor excited at ultraviolet 250-290 nm and near ultraviolet 396 nm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh Li according to the molar ratio Li:Zn:P:Eu=1.09:0.82:1:0.09 2 CO 3 , ZnO, (NH 4 ) 2 HPO 4 , Eu 2 o 3 , the above raw materials are all analytically pure, after mixing the above raw materials evenly, put them into an alumina crucible and place them in a muffle furnace for roasting in an air atmosphere at a temperature of 500°C and keep them warm for 5 hours; grind them after cooling, and then put them in an air atmosphere Baking at 1000°C for 3 hours. The resulting product is crushed, washed with water to remove impurities, and dried to obtain the chemical composition of Li 1.09 Zn 0.82 PO 4 :0.09Eu 3+ sample.

Embodiment 2

[0028] Weigh Li according to the molar ratio Li:Zn:P:Eu=1:0.91:1:0.09 2 CO 3 , ZnO, (NH 4 ) 2 HPO 4 , Eu 2 o 3 , the above raw materials are all analytically pure, after mixing the above raw materials evenly, put them into an alumina crucible and place them in a muffle furnace for roasting in an air atmosphere at a temperature of 500°C and keep them warm for 5 hours; grind them after cooling, and then put them in an air atmosphere Baking at 1000°C for 3 hours. The obtained product is crushed, washed with water to remove impurities, and dried to obtain the chemical composition of LiZn 0.91 PO 4 :0.09Eu 3+ sample.

Embodiment 3

[0030] Weigh Li according to the molar ratio Li: Zn: P: Eu=1.11:0.78:1:0.11 2 CO 3 , ZnO, (NH 4 ) 2 HPO 4 , Eu 2 o 3 , the above raw materials are all analytically pure, after mixing the above raw materials evenly, put them into an alumina crucible and place them in a muffle furnace for roasting in an air atmosphere at a temperature of 500°C and keep them warm for 5 hours; grind them after cooling, and then put them in an air atmosphere Baking at 1000°C for 3 hours. The resulting product is crushed, washed with water to remove impurities, and dried to obtain the chemical composition of Li 1.11 Zn 0.78 PO 4 :0.11Eu 3+ sample.

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Abstract

The invention relates to phosphor excited at ultraviolet 250-290 nm and near ultraviolet 396 nm and a preparation method thereof, and belongs to the technical field of rare earth luminescent materials. The purpose is to provide phosphor with stable chemical performance and good luminous effect so as to meet the requirements for high-brightness high-color rendering rare earth energy saving lamps and white light LED assembly. The following technical scheme is adopted: the phosphor adopts lithium zinc phosphate as a substrate, and Zn2+ is substituted by Eu3+. The invention has the following advantages: the excitation wavelength range is wide; the luminous effect is good; double-peak emission with coexistence of orange red light and dark red light is formed; the phosphor of the invention has stable physical and chemical properties, does not react with oxygen, water, carbon dioxide and the like in environment, is heat-resistant, nontoxic, and pollution-free; the preparation method of the phosphor of the invention is simple, and easy to operate; no cosolvent is added during the preparation process, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to a fluorescent powder that can be effectively excited at ultraviolet 250-290nm and near ultraviolet 396nm and a preparation method thereof, belonging to the technical field of rare earth luminescent materials. Background technique [0002] Energy-saving lighting is one of the main contents of low-carbon economy. Rare earth fluorescent materials are key materials in energy-saving lamps and white LED lamps. Phosphors that have been widely used in energy-saving lamps include blue, green and red phosphors. In LED white light lighting devices, the most widely used technical solution is the use of blue light-emitting diodes (Light Emitting Diode, LED) and yellow fluorescent conversion material Y, which was first reported in 1997. 3 A1 5 o 12 : Ce 3+ (YAG:Ce) is matched to form a white light-emitting device by combining blue and yellow light, but the color rendering performance is poor due to the lack of red light. In order to so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/70
Inventor 祝文才饶阳马帅周雪珍欧阳春梅周新木
Owner GANZHOU ZHANHAI IND & TRADING
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