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Alkaline earth nitride fluorescent powder and preparation method thereof

A nitride phosphor, alkaline earth technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high synthesis conditions and high cost of nitride phosphors, and achieve excellent luminescence performance, long service life, physical and chemical properties. Stable performance

Inactive Publication Date: 2012-06-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of relatively high synthesis conditions and high cost of the existing nitride phosphors, provide a nitride luminescent material and its preparation method, and obtain a nitride luminescent material with excellent luminescent properties

Method used

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  • Alkaline earth nitride fluorescent powder and preparation method thereof
  • Alkaline earth nitride fluorescent powder and preparation method thereof
  • Alkaline earth nitride fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Select the batching point m=0.02, the CaSi alloy with a purity of not less than 99.5% (molar ratio is 1:1), α-Si 3 N 4 Powder, Eu 2 o 3 Put it in a mortar with a molar ratio of 196:101:2, use n-hexane as the dispersion medium, fully grind until uniform, dry, and press into tablets. Then loaded in the graphite furnace, under 5 atmospheres of N 2 Under the protection of the atmosphere, the temperature was raised to 1400°C for sintering for 4 hours and then cooled with the furnace. The final specific expression of the obtained nitride is 0.653Ca 3 N 2 1.667Si 3 N 4 :0.04Eu 2+ . The position of the main emission peak of the prepared nitride material is at 609nm.

Embodiment 2

[0025] Select the batching point m=0.02, the CaSi alloy with a purity of not less than 99.5% (molar ratio is 1:1), α-Si 3 N 4 Powder, EuSi molar ratio 49:25:1, placed in a mortar, using n-hexane as the dispersion medium, fully ground until uniform, and dried. Then loaded in the graphite furnace, under 5 atmospheres of N 2Under the protection of the atmosphere, the powder is sintered, and the temperature is raised to 1400°C for 4 hours and then cooled with the furnace. The final specific expression of the obtained nitride is 0.653Ca 3 N 2 1.667Si 3 N 4 :0.04Eu 2+ . The position of the main emission peak of the prepared nitride material is at 610nm.

Embodiment 3

[0027] Select the dosing point m=0.02, the SrSi alloy with a purity of not less than 99.5% (molar ratio is 1:1), α-Si 3 N 4 The powder, EuSi, is placed in a mortar with a molar ratio of 49:25:1, with n-hexane as the dispersion medium, fully ground until uniform, dried, and pressed into tablets. Then loaded in the graphite furnace, under 5 atmospheres of N 2 Under the protection of the atmosphere, the temperature was raised to 1400°C for sintering for 4 hours and then cooled with the furnace. The final specific expression of the obtained nitride is 0.653Sr 3 N 2 1.667Si 3 N 4 :0.04Eu 2+ . The position of the main emission peak of the prepared nitride material is at 621nm.

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Abstract

The invention provides alkaline earth nitride fluorescent powder and a preparation method thereof. A chemical general formula is xM3N2-aSi3N4-bMY2:mR, wherein M is one kind or several kinds of Mg, Ca, Sr and Ba; Y is one kind or several kinds of F, Cl and Br; R represents one kind or several kinds of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Tm and Yb selecting from rare earth elements; and a parameter range is 0.3<x<1, 0.1<a<2, 0<b<0.1, and 0.005<m<0.5. Products of the alkaline earth nitride fluorescent powder is prepared by adopting a direct high temperature solid-state reaction method, and the nitride fluorescent powder with a specific luminous center R and base elements with different percentage values is obtained. The fluorescent powder has good luminance performance in a visible light spectrum range, and when the fluorescent powder is excited by using light with wavelength ranging from 250 to 550 nm, an emission spectrum with the wavelength ranging from 500 to 750 nm can be obtained.

Description

technical field [0001] The present invention relates to the technical field of luminescent materials, and in particular provides a nitride phosphor powder and a preparation method thereof, which are binary or multi-element alloys of high-purity MSi (M is Mg, Ca, Sr, Ba and other alkaline earth metals) and the chemical formula is my 2 (Y is F, Cl, Br) halides as raw materials, Si 3 N 4 (or Si powder), the source of rare earth elements is to use simple substances or oxides or alloys as raw materials, and prepare nitride luminescent materials with excellent luminescent properties through high-temperature solid-state sintering. Background technique [0002] Nowadays, semiconductor light-emitting (LED) is widely used day by day, and it is more and more likely to replace the traditional period in the energy-saving lighting and display industry. Its basic luminescence principle is to use short-wavelength light emitted by GaN-based blue light or ultraviolet chips to excite one or...

Claims

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Application Information

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IPC IPC(8): C09K11/59C09K11/61
Inventor 刘泉林陈国动任清勇
Owner UNIV OF SCI & TECH BEIJING
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