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Europium doped lanthanum-strontium triborate based green fluorescent powder and preparation method thereof

A technology based on triboric acid and green light, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low display index and high correlated color temperature of white LEDs, and achieve the effect of low matrix cost, good stability and easy preparation

Inactive Publication Date: 2017-08-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a europium-doped lanthanum strontium triborate-based green phosphor to solve the problems of high correlated color temperature and low display index of existing white light LEDs

Method used

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  • Europium doped lanthanum-strontium triborate based green fluorescent powder and preparation method thereof
  • Europium doped lanthanum-strontium triborate based green fluorescent powder and preparation method thereof
  • Europium doped lanthanum-strontium triborate based green fluorescent powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Take x=0.02, according to the chemical formula Sr 2.98 La(BO 3 ) 3 : The stoichiometric ratio of 0.02Eu, accurately weigh SrCO with electronic balance 3 , La 2 o 3 、H 3 BO 3 and Eu 2 o 3 , wherein the purity of rare earth oxides is 99.99%, and the rest are analytically pure; after grinding the above raw materials for 20 minutes, put them into a corundum crucible, place them in a SX3-10-14 type rapid heating resistance furnace, and calcinate them in an air atmosphere. Raise the heating rate to 1250°C at a rate of 5°C / min, keep it warm for 3 hours, and then cool with the furnace until it reaches room temperature; take out the calcined sample and grind it again for 20 minutes to obtain europium-doped lanthanum strontium triborate-based green phosphor.

Embodiment 2

[0035] Take x=0.04, according to the chemical formula Sr 2.96 La(BO 3 ) 3 : Stoichiometric ratio of 0.04Eu, accurately weigh SrCO with electronic balance 3 , La 2 o 3 、H 3 BO 3 and Eu 2 o 3, wherein the purity of rare earth oxides is 99.99%, and the rest are analytically pure; after grinding the above raw materials for 30 minutes, put them into a corundum crucible, place them in a SX3-10-14 type rapid heating resistance furnace, and calcinate them in an air atmosphere. Raise the heating rate to 1270°C at a rate of 6°C / min, keep it warm for 4 hours, and then cool with the furnace until it reaches room temperature; take out the calcined sample and grind it again for 50 minutes to obtain europium-doped lanthanum strontium triborate-based green phosphor.

[0036] figure 1 It is the Sr prepared in Example 2 2.96 La(BO 3 ) 3 :0.04Eu phosphor and Sr 3 La(BO 3 ) 3 X-ray diffraction pattern of the matrix. Sr is currently not found in the PDF card library 3 La(BO 3 ) ...

Embodiment 3

[0038] Take x=0.08, according to the chemical formula Sr 2.92 La(BO 3 ) 3 : Stoichiometric ratio of 0.08Eu, accurately weigh SrCO with electronic balance 3 , La 2 o 3 、H 3 BO 3 and Eu 2 o 3 , wherein the purity of rare earth oxides is 99.99%, and the rest are analytically pure; after the above-mentioned raw materials are ground for 60 minutes, they are put into corundum crucibles, placed in a SX3-10-14 type rapid heating resistance furnace, and calcined in an air atmosphere. Raise the heating rate to 1300°C at a rate of 10°C / min, keep it warm for 5 hours, and then cool with the furnace until it reaches room temperature; take out the calcined sample and grind it again for 60 minutes to obtain europium-doped lanthanum strontium triborate-based green phosphor.

[0039] figure 2 Sr prepared for Example 3 2.92 La(BO 3 ) 3 : Excitation and emission spectra of 0.08Eu phosphor. The excitation spectrum of the phosphor is between 330nm and 500nm, and the main excitation pe...

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Abstract

The invention discloses a europium-doped lanthanum strontium triborate-based green fluorescent powder, which uses Sr3La(BO3)3 as a matrix, and has a general chemical formula of Sr3-xLa(BO3)3:xEu, wherein 0.02≤x≤0.20, through Doped with activated ions Eu3+ to prepare europium-doped lanthanum strontium triborate-based green light emitting phosphors. Under near-ultraviolet and blue light excitation, red light with a main peak at around 615nm is obtained, which is suitable for near-ultraviolet or blue light excitation, and the emission peaks are located at 594nm respectively. , 615nm, 625nm, 709nm, the color coordinates are located in the red light region, the chemical properties are stable, the luminous performance is good, the luminous intensity is high, and the color rendering is good. It is a green phosphor with excellent luminous performance; the invention also discloses its preparation Method: SrCO3, La2O3, H3BO3 and Eu2O3 are mixed and ground, calcined in the air atmosphere, kept warm, cooled with the furnace and then ground, and finally europium-doped lanthanum strontium triborate-based green phosphor is obtained, which is prepared based on solid-phase synthesis method , strong operability, simple heating process, simple method, good reproducibility, and short preparation period.

Description

technical field [0001] The invention belongs to the technical field of phosphor preparation for LEDs, and in particular relates to a europium-doped lanthanum strontium triborate-based green phosphor, and also relates to a preparation method of the europium-doped lanthanum strontium triborate-based green phosphor. Background technique [0002] Light Emitting Diode (LED) is recognized as a new light source in the 21st century. It has many advantages such as energy saving, fast response, green environmental protection, long life, small size, and high luminous efficiency. Application prospects: Rare earth ions have good physical and chemical stability and luminescent properties, and their doped luminescent materials have broad application prospects in the fields of green lighting, short-wavelength lasers, information display, bioluminescence marking, and optoelectronics. [0003] At present, commercial white LEDs produce white light mainly through the green light generated by Ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
CPCC09K11/7797
Inventor 武秀兰焦叶辉任强海鸥林飞李欢欢白文妮
Owner SHAANXI UNIV OF SCI & TECH
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