采用高温固相法合成了Eu2+激活的不同镓含量的CaS-Ga2S3系列荧光粉.随镓含量的增加荧光粉的体色由红色过渡到黄色,其发射光谱由红光到黄光.通过XRD和漫反射谱测试得到,当Ga/Ca值＜2时,其成份为CaS与CaGa2S4的混合物;当Ga/Ca值＞2时,其成份为CaGa2S4与Ga2S3的混合物.当Ga/Ca值＞0.5时红光已基本上测不到,且Ga适当的过量可使CaGa2S4:Eu2+在可见光区的激发和发光效率提高.
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