A kind of red fluorescent powder and preparation method thereof

Abstract

The invention relates to red-emit phosphor and a preparing method thereof. The chemical formula of the red-emit phosphor is (Yb1-xEux)2Si2O7, wherein the range of X is 0<X<=0.2. The preparing method comprises the steps of dissolving Yb(NO3)3.6H2O, Eu(NO3)3.6H2O into a solvent, conducting stirring under a water bath condition to obtain a colorless and transparent solution, then cooling the temperature of the solution to an indoor temperature, dropwise adding ethyl orthosilicate into the solution, stirring and blending uniformly to obtain a mixed solution, then adding a catalyst to conduct a stirring reaction to obtain a precursor solution, conducting ageing, drying and roasting to obtain a gel, grinding the gel to powder, conducting roasting and grinding again to obtain the red-emit phosphor. The red-emit phosphor is a single-phase material, has a good luminescence property and a stable chemical property; meanwhile, the phosphor body has good high temperature resistance and high moisture resistance. The preparing method is simple to operate, has low requirements on equipment, and is applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of fluorescent materials and their preparation, and in particular relates to a red fluorescent powder and a preparation method thereof. Background technique [0002] LED lighting is the most promising lighting technology in the 21st century. Phosphor powder is the core part of white light emission in LEDs that convert fluorescence into white light. At present, the schemes for synthesizing white light LEDs mainly include blue light chips compounded with yellow phosphors and near-ultraviolet chips compounded with trichromatic phosphors. Two kinds of powder. The white light LED currently under research generally uses 395nm-405nm, 355nm-365nm near-ultraviolet chips and 455nm-465nm blue light chips, and the excitation spectrum of the phosphor powder used for the corresponding LED chip should be within this range. Because the LED with blue light chip and yellow phosphor is easy to adjust the color temperature and easy to p...

AI Technical Summary

Problems solved by technology

Because the LED with blue light chip and yellow phosphor is easy to adjust the color temperature and easy to package, it is more accepted by the market. However, this white light LED is composed of two colors of light, and the emission spectrum is only composed of yellow and blue light. It lacks red visible light. As a result, the color rendering performance of white LED devices (Ra<80) is much lower than that of traditional incandescent lamps (Ra~100), and the obtained white LED lighting effects are not realistic enough

The general method to achieve warm white light is to add red phosphor to the system, such as sulfide system phosphor CaS:Eu 2+ or SrS:Eu 2+ etc., but these sulfur-containing red phosphors have poor stability and are easy to decompose, especially in high-temperature and humid environments. 2 Si 5 N 8 :Eu 2+ or α-SiAlON:Eu 2+ etc. The synthesis of nitrogen oxide red phosphor requires high temperature and high pressure synthesis conditions, which are extremely harsh and difficult to obtain

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