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Phosphate green fluorescent powder for white LED and preparation method of phosphate green fluorescent powder

A green fluorescent powder and phosphate technology, which is applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of harsh preparation conditions, complex synthesis process, and high synthesis cost, and achieve good chemical stability and thermal stability. Stability, simple synthesis process, and uniform particle size

Active Publication Date: 2014-12-10
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation conditions of silicon-based nitrogen (oxide) oxide green phosphor are demanding, and the synthesis process is complex and unstable. It needs to be completed under high temperature and pressure, and the synthesis cost is relatively high. Therefore, the low-cost synthesis process still needs further research.

Method used

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  • Phosphate green fluorescent powder for white LED and preparation method of phosphate green fluorescent powder
  • Phosphate green fluorescent powder for white LED and preparation method of phosphate green fluorescent powder
  • Phosphate green fluorescent powder for white LED and preparation method of phosphate green fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A kind of phosphate green fluorescent powder for white light LED, according to Sr 4 La 0.995 (PO 4 ) 3 O: 0.005Ce 3+ Weigh SrHPO 4 , SrCO 3 , La 2 o 3 and Eu 2 o 3 , the molar ratio between them is 3:1:0.4975:0.0025. After fully grinding and mixing evenly, place it in a corundum crucible, put it into a high-temperature furnace and bake at 1250°C for 3 hours in a CO atmosphere, and then cool to room temperature to obtain Phosphate blue phosphor.

[0032] from figure 1 It can be seen from the figure that the excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, purple and blue light regions, and the excitation peak is located near 360 nm, indicating that the phosphor powder of this embodiment can be effectively excited by blue light or purple light chips. When the excitation wavelength of the emission spectrum is 360nm, from figure 2 It can be seen from the figure that the emission of the phosphor powder ...

Embodiment 2

[0034] A kind of phosphate green fluorescent powder for white light LED, according to Sr 4 La 0.999 (PO 4 ) 3 O: 0.001Ce 3+ Weigh SrHPO 4 , SrCO 3 , La 2 o 3 and Eu 2 o 3 , the molar ratio between them is 3:1:0.4995:0.0005. After fully grinding and mixing evenly, put it in a corundum crucible, put it into a high-temperature furnace and bake it at 1350°C for 7 hours in a CO atmosphere, and then cool it to room temperature to get Phosphate blue phosphor.

[0035] The excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 360nm, indicating that the phosphor powder of this embodiment can be effectively excited by blue light or purple light chips. When the excitation wavelength of the emission spectrum is 360nm, from Figure 4 It can be seen from the figure that the emission of the phosphor powder of the present invention is the broadband orange-re...

Embodiment 3

[0037] A kind of phosphate green fluorescent powder for white light LED, according to Sr 4 La 0.99 (PO 4 ) 3 O: 0.01Ce 3+ Weigh NH 4 h 2 PO 4 , SrCO 3 , La 2 o 3 and Eu 2 o 3 , the molar ratio between them is 3:4:0.495:0.005. After fully grinding and mixing evenly, place it in a corundum crucible, then put it into a high-temperature furnace and bake at 1250°C for 7 hours in a CO atmosphere, and then cool to room temperature to obtain Phosphate blue phosphor.

[0038] The excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 360nm, indicating that the phosphor powder of this embodiment can be effectively excited by blue light or purple light chips. When the excitation wavelength of the emission spectrum is 360nm, the emission of the phosphor powder of the present invention is the broadband orange-red emission of trivalent cerium, and the emis...

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Abstract

The invention relates to the technical field of rare-earth luminescent materials. Phosphate green fluorescent powder for a white LED is characterized by having a chemical expression of Sr4La1-x(PO4)3O:xCe<3+>, wherein x is 0.001-0.10. The phosphate green fluorescent powder for the white LED has the advantages of good dispersity, uniform particle size, good chemical stability and high luminous efficiency, and an excitation band of the phosphate green fluorescent powder covers ultraviolet, purple light and blue light regions, thus the phosphate green fluorescent powder is suitable for being used as green fluorescent powder for an ultraviolet LED.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to a phosphate green fluorescent powder for white LEDs and a manufacturing method thereof. Background technique [0002] White LED is a solid-state semiconductor device that converts electrical energy into white light, also known as semiconductor lighting. It has many advantages such as high efficiency, small size, long life, safety, low voltage, energy saving, and environmental protection. , Fluorescent lamps, and high-pressure gas discharge lamps are the fourth generation of lighting sources, which will be the mainstream products in the future lighting market. [0003] There are two main technical solutions for white light LED: [0004] Multi-chip type, red LED, green LED and blue LED chips are combined into one pixel to realize white light. [0005] Single LED chip type + phosphor; (1) blue LED + yellow phosphor, which is currently the most widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
CPCY02B20/00
Inventor 邓德刚徐时清王焕平黄立辉华有杰夹国华戴剑黄君
Owner CHINA JILIANG UNIV
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