中文摘要：

采用溶胶凝胶-燃烧法合成Sr_（2-x-y）Ca_xMg_yAl_2SiO_7∶Eu2＋稀土长余辉发光材料,通过TG-DTA、XRD、SEM和荧光光谱分析等方法,研究了材料的结构、颗粒形貌和发光性能,并对Ca2＋、Mg2＋、Eu2＋不同掺杂浓度下的发光性能进行了对比研究。结果表明,适量掺杂Ca2＋、Mg2＋、Eu2＋后,基质的晶格结构并未发生变化,为Sr_2Al_2SiO_7晶粒,粒径在1 um～4 um,其激发光谱是位于峰值340 nm～360 nm的宽带谱,发射光谱峰值位于460 nm～480 nm。掺杂Ca2＋、Mg2＋后发光强度得到提高,镁元素的掺杂可引起发射波长向长波方向移动,而钙元素掺杂可引起发光强度的增大。影响材料发光性能的主要因素是钙,其次是铕,在实验条件下当Ca2＋的掺杂量为0.2,Mg2＋的掺杂量为0.1,Eu2＋的掺杂量为0.04时发光强度为最大,其发射光谱峰值位于469 nm处,最大发射光谱强度达到了8500。

英文摘要：

Sr2-x-yCaxMgyAl2SiO7∶Eu2＋ long afterglow phosphors were synthesized by SOL- GEL- combustion reduction method. The crystal structure morphology and the luminescent properties of the samples were characterized and measured by u- sing the method of TG - DTA, XRD , SEM and fluorescence analysis, respectively. The effects of mole content of Sr2-x-yCaxMgyAl2SiO7∶Eu2＋ on the luminescence properties of the Sr2-x-yCaxMgyAl2SiO7∶Eu2＋ sample were discussed. The results showed that the sample has a single Sr2 A12 SiO7 phase and good crystalline state, and its crystalline grain size is about 1 ～ 4 um. The excita- tion spectra are located in 340 ~ 360 nm, emission spectra are located in 360 -380 nm. Under the experimental condition, the luminous intensity reaches the maximum value when the Ca2＋ doping amount is 0.2, Mg2＋ doping amount is 0.1 and the Eu2. doped amount is 0.04, the emission spectrum peak is located at 469 nm, and maximum emission spectrum intensity reached 8500.