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利用硝酸盐和含硫燃烧剂硫脲的氧化还原反应,通过燃烧法在较低的起始温度(500~550℃)合成了白光发光二级管用红色荧光粉Ca1-xSrxS:Eu2+,研究了其发光性质。X射线衍射分析表明合成物为纯相的Ca1-xSrxS:Eu2+。激发谱和发射谱的研究表明:(Ca1-xSrx)S:Eu2+能被430~500nm的可见光有效地激发而发出600~650nm的红光。与高温固相法相比,燃烧法制备的荧光粉的激发光谱没有明显变化,燃烧法生成物分散性好,制备过程中反应初始温度比较低(500℃左右),反应时间短(10min左右),无污染。反应所用的硫脲价格低廉,反应速度快,是一种实用的燃烧剂。
The red phosphor Ca1-xSrxS: Eu2 + for white light-emitting diodes was synthesized by the combustion method at a low initial temperature (500-550 ℃) by the redox reaction of nitrate with the thiourea which is a sulfur-containing combustion agent. Luminous properties. X-ray diffraction analysis showed that the composition was pure phase of Ca1-xSrxS: Eu2 +. The excitation spectrum and emission spectrum show that: (Ca1-xSrx) S: Eu2 + can be efficiently excited by the visible light of 430 ~ 500nm to emit 600 ~ 650nm red light. Compared with the high temperature solid state method, the excitation spectrum of the phosphor prepared by the combustion method showed no obvious change. The combustion method has good dispersivity, the initial reaction temperature is lower (about 500 ℃), the reaction time is short (about 10min) No pollution. Thiourea used in the reaction is inexpensive and has a fast reaction rate, which is a practical combustion agent.