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Silicate green emitting phosphor and preparation method thereof

A green phosphor, silicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of harsh preparation conditions, complex synthesis process, and high synthesis cost, and achieve good chemical stability and thermal stability. The effect of simple synthesis process and low reaction temperature

Active Publication Date: 2016-05-11
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 relatively complicated 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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  • Silicate green emitting phosphor and preparation method thereof
  • Silicate green emitting phosphor and preparation method thereof
  • Silicate green emitting phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to Li 2 O·Al 2 o 3 4SiO2 2 : 0.005Eu 2+ Weigh Li 2 CO 3 、Al 2 o 3 , SiO 2 and Eu 2 o 3 , the molar ratio between them is 1:1:4:0.0025. After fully grinding and mixing, place it in a corundum crucible, then put it into a tube furnace and bake it at 1000°C for 7 hours under a nitrogen-hydrogen mixed atmosphere, and then cool it to At room temperature, a silicate green phosphor was obtained.

[0025] 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 and violet light regions, the excitation peak is located near 360nm, and the spectral peak is high, indicating that the phosphor powder of this embodiment can be effectively excited by the ultraviolet and violet 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 in this embodiment...

Embodiment 2

[0027] According to Li 2 O·Al 2 o 3 4SiO2 2 : 0.01Eu 2+ Weigh Li 2 CO 3 、Al 2 o 3 , SiO 2 and Eu 2 o 3 , the molar ratio between them is 1:1:6:0.005. After fully grinding and mixing, place it in a corundum crucible, then put it into a tube furnace and bake at 1100°C for 5 hours under a nitrogen-hydrogen mixed atmosphere, and then cool to At room temperature, a silicate green phosphor was obtained.

[0028] The excitation spectrum of the phosphor powder in this embodiment is a wide spectrum, covering the ultraviolet and violet light regions, and the excitation peak is located near 360nm, with a high spectral peak, indicating that the phosphor powder of this embodiment can be effectively excited by the ultraviolet and violet light chips. When the excitation wavelength of the emission spectrum is 360nm, the emission of the phosphor powder in this embodiment is the broadband green light emission of divalent europium, and the emission peak is located near 500nm, indicati...

Embodiment 3

[0030] According to Li 2 O·Al 2 o 3 4SiO2 2 : 0.1Eu 2+ Weigh Li 2 CO 3 、Al 2 o 3 , SiO 2 and Eu 2 o 3 , the molar ratio between them is 1:1:4:0.05. After fully grinding and mixing, place it in a corundum crucible, then put it into a tube furnace and bake it at 1200°C for 2 hours in a nitrogen-hydrogen mixture atmosphere, and then cool it down. to room temperature to obtain silicate green phosphor.

[0031] The excitation spectrum of the phosphor powder in this embodiment is a wide spectrum, covering the ultraviolet and violet light regions, and the excitation peak is located near 360nm, with a high spectral peak, indicating that the phosphor powder of this embodiment can be effectively excited by the ultraviolet and violet light chips. When the excitation wavelength is 360nm, the emission of the phosphor powder in this embodiment is the broadband green light emission of divalent europium, and the emission peak is near 500nm, indicating that the phosphor powder in th...

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Abstract

The invention relates to the field of rare earth luminescent materials, in particular to a silicate green emitting phosphor. The silicate green emitting phosphor is of a chemical expression of Li2O.Al2O3.(n+4)SiO2:xEu2+, wherein n is equal to 0-4, and x is equal to 0.005-0.1. The silicate green emitting phosphor has the good chemical stability and heat stability, has the wide excitation bandwidth, and covers the ultraviolet, purple-light and blue-light regions.

Description

technical field [0001] The invention relates to the field of rare earth luminescent materials, in particular to a silicate green fluorescent powder and a preparation 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] At present, there are various white light LED preparation methods, among which the combination of blue LED chip and yellow fluorescent material, combination of blue LED chip and red and green fluorescent material, and combination of purple LED chip and trichromatic fluorescent material are the three methods with low pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
CPCC09K11/7734
Inventor 邓德刚吴铭李林茹陈七仙徐时清华有杰柴文祥马玉涛
Owner CHINA JILIANG UNIV
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