采用高温固相法在弱还原气氛下制备了Ca0.955-xSrxAl2Si2O8:Eu2+(x=0～0.9)系列荧光粉,研究了Sr2+置换Ca2+对晶体结构和光谱特性的影响.Sr2+进入CaAl2 Si2O8晶格与Ca2+发生类质同相替代形成连续固溶体,物相从CaAl2Si2O8相(Triclinic,P1)逐渐转换为SrAl2 Si2O8相(Monoclinic,I2/c),晶胞参数a,b,c和晶胞体积都随Sr2+置换量呈线性增加,a,β卢和γ在置换量为0.1-0.7区间缓慢减小,超过0.7后呈线性急剧减小.位于250-410 m区间的宽带激发光谱由4个激发峰构成,表观峰值位于356nm.Eu2+占据两种格位形成两个发光中心,分别产生430和468 nm发射,宽带发射光谱位于390～550nm区间,呈现近白色发光.控制Sr2+含量可使表观发射峰位置在408～434nm之间移动,强度随Sr2+含量增加而增强.
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