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Europium ion activated silicon-based nitrogen oxide green fluorescent powder and preparation method thereof

A technology of silicon-based oxynitride and green fluorescent powder, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of shortage and low color rendering index, and achieve the effects of not easy deliquescence, simple preparation process and simple steps

Inactive Publication Date: 2014-06-04
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is currently the most widely used and most mature, but its shortcomings are very obvious. The main reason is that the white light formed by the combination of the blue chip and the yellow primary color lacks the red component, so the color rendering index is low.

Method used

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  • Europium ion activated silicon-based nitrogen oxide green fluorescent powder and preparation method thereof
  • Europium ion activated silicon-based nitrogen oxide green fluorescent powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Implementation Example 1: Ca 2.985 Si 2 o 4 N 2 :0.015Eu 2+ preparation of

[0024] First, according to the chemical formula Ca 2.985 Si 2 o 4 N 2 :0.015Eu 2++ The stoichiometric ratio of the reaction raw material CaCO was weighed 3 , SiO 2 、Si 3 N 4 、Eu 2 o 3 , put the above-mentioned reaction raw materials weighed into a mortar, add an appropriate amount of alcohol, and grind for about 30 minutes until they are evenly mixed; then put the above-mentioned mixture in a drying oven, put it in a crucible after drying, and put it in a high-temperature tube furnace , raise the temperature to 1300°C under the reducing atmosphere of the mixed gas of hydrogen and nitrogen, and calcinate at this temperature for 6 hours, then cool down the product again, take it out after cooling to room temperature, and obtain the europium-doped sample after grinding and heat treatment. Hetero-silicon oxynitride Ca 2.985 Si 2 o 4 N 2 :0.015Eu 2+ Green phosphor.

Embodiment 2

[0025] Implementation Example 2: Ca 2.97 Si 2 o 4 N 2 :0.03Eu 2+ preparation of

[0026] First, according to the chemical formula Ca 2.97 Si 2 o 4 N 2 :0.03Eu 2+ The stoichiometric ratio of the reaction raw material CaCO was weighed 3 , SiO 2 、Si 3 N 4 、Eu 2 o 3 , put the above-mentioned reaction raw materials weighed into a mortar, add an appropriate amount of alcohol, and grind for about 30 minutes until they are evenly mixed; then put the above-mentioned mixture in a drying oven, put it in a crucible after drying, and put it in a high-temperature tube furnace , raise the temperature to 1400°C under the reducing atmosphere of the mixed gas of hydrogen and nitrogen, calcined at this temperature for 8 hours, then lower the temperature of the product, take it out after cooling to room temperature, and obtain the europium-doped sample after grinding and heat treatment. Hetero-silicon oxynitride Ca 2.97 Si 2 o 4 N 2 :0.03Eu2+ Green phosphor.

Embodiment 3

[0027] Implementation Example 3: Ca 2.85 Si 2 o 4 N 2 :0.15Eu 2+ preparation of

[0028] First, according to the chemical formula Ca 2.85 Si 2 o 4 N 2 :0.15Eu 2+ The stoichiometric ratio of the reaction raw material CaCO was weighed 3 , SiO 2 、Si 3 N 4 、Eu 2 o 3 , put the above-mentioned reaction raw materials weighed into a mortar, add an appropriate amount of alcohol, and grind for about 30 minutes until they are evenly mixed; then put the above-mentioned mixture in a drying oven, put it in a crucible after drying, and put it in a high-temperature tube furnace , under the reducing atmosphere of the mixed gas of hydrogen and nitrogen, the calcination temperature was raised to 1500°C, and the calcination was carried out at this temperature for 6 hours. Hetero-silicon oxynitride Ca 2.85 Si 2 o 4 N 2 :O.15Eu 2+ Green phosphor.

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Abstract

The invention belongs to the technical field of a rare-earth luminescent material, and relates to europium ion activated silicon-based nitrogen oxide green fluorescent powder and a preparation method thereof. The europium ion activated silicon-based nitrogen oxide green fluorescent powder comprises chemical ingredients as shown in the following chemical formula: M3(1-x)Si2O4N2:3xEu<2+>, wherein the M element is an alkaline-earth metal element such as Ca, Mg, Sr, Ba and the like, x is not smaller than 0.002 and not larger than 0.01, and the Eu<2+> is doped rare-earth ion. The preparation method disclosed by the invention is used for synthesizing the green fluorescent powder M3(1-x)Si2O4N2:3xEu<2+> through a high-temperature solid-phase synthesis method. The green fluorescent powder emits intensive green light under excitation of near ultraviolet light; the absorbency is quite high within an excitation wavelength range of 270nm-450nm; the main emission peak is at about 510nm, and the green fluorescent powder has high luminous efficiency, high intensity and good thermal stability and can be used in white light LED (Light Emitting Diode) with high color rendering property; the preparation method of the green fluorescent powder is simple, gentle in reaction condition, easy to operate, energy-saving and time-saving, and has extremely good application prospect in solid illumination field.

Description

technical field [0001] The invention relates to a europium ion-activated silicon-based nitrogen oxide green fluorescent powder and a preparation method thereof, in particular to a fluorescent powder emitting green fluorescence under near-ultraviolet light excitation, which can be applied to ultraviolet-near-ultraviolet white light LEDs The invention belongs to the technical field of rare earth luminescent materials. Background technique [0002] White light-emitting diode (LED) is called the fourth generation of lighting source. As a new generation of solid light source, in addition to overcoming the shortcomings of traditional incandescent and fluorescent lamps such as high energy consumption, fragility, and pollution, it also has small size and environmental protection. , fast response, long life, planar packaging, high luminous intensity, high efficiency, energy saving, vibration resistance, low voltage drive, and no environmental pollution. Especially in recent years, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
Inventor 魏健沈常宇刘桦楠路艳芳陈德宝
Owner CHINA JILIANG UNIV
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