中文摘要：

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CaAl2Si2O8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SrAl2Si2O8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,α,β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 nm区间的宽带激发光谱由4个激发峰构成,表观峰值位于356 nm。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390~550 nm区间,呈现近白色发光。控制Sr2＋含量可使表观发射峰位置在408~434 nm之间移动,强度随Sr2＋含量增加而增强。

英文摘要：

A series of luminescence phosphors Ca0.955-xSrxAl2Si2O8： Eu2＋（x=0~0.9） were prepared via solid-state reaction at weak reductive atmosphere.The lattice positions and the luminescent mechanism of Eu2＋ in the host were discussed.The effects of Sr2＋ substitution on the host lattices and spectral properties were also investigated.It was found that when Sr2＋ entered CaAl2Si2O8 lattice and substituted Ca2＋,thoroughly solid solutions formed and the phase transformed from triclinic（P1-） CaAl2Si2O8 to monoclinic（I2/c） SrAl2Si2O8 when Sr2＋content was more than 70%（mole fraction）.The lattice parameters（a,b,c） and unit cell volume of phosphors Ca0.955-xSrxAl2Si2O8： Eu2＋（x=0.1~0.9） increased linearly as Sr2＋ content increased.While α,β,γ decreased slowly in the range of x=0~0.7,and then decreased sharply when x0.7.A broad excitation spectrum consisted of four excitation bands,which located between 250 and 410 nm,and the maximum excitation wavelength was 356 nm.The Eu2＋ ions occupied two different lattice sites and formed two luminescent centers with the emissions at 430 and 468 nm,respectively.The emission spectrum was a broad band between 395 and 550 nm,and it showed nearly white light exited with 365 nm.The location of peak could shift between 408 and 434 nm with various content of Sr2＋,and the intensity increased with Sr2＋ content increasing.