利用硝酸盐和含硫燃烧剂硫脲(CH4N2S)的氧化还原反应,通过燃烧法在较低的起始温度(500～550 ℃)下合成了白光LED用红色荧光粉(Ca1-xSrx)S:Eu2+,并研究了实验过程中各种实验条件对其发光性能的影响.XRD图像表明不同物质的量比的Sr与Ca合成的荧光粉均为立方相的(Ca1-xSrx)S:Eu2+.SEM图像表明燃烧法合成的(Ca1-xSrx)S:Eu2+的晶体粒径为微米量级,且颗粒均匀.当n(Sr)∶n(Ca)=1时,它的激发谱为1个覆盖430～500 nm的宽带,发射谱为峰值位于624 nm的宽带.当Eu2+的摩尔分数为0.008时,发光强度达到最大值.所得前驱物在1 100 ℃的马弗炉中退火5 h,发光强度与结晶度将进一步提高.与高温固相法相比,激发光谱与发射光谱没有明显变化,燃烧法生成物分散性好,反应初始温度比较低(500 ℃左右),反应时间短(10 min左右).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.
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