摘要
Mn^(2+)浓度C(0.5％,0.6％)相同,而煅烧温度不同的DCEL ZnS:Mn、Cu粉未样品的EPR谱是不同的.用微机模拟EPR谱,计算出Mn^(2+)团所占Mn^(2+)的比例Cc/C.煅烧温度低于950℃时,Mn^(2+)团比例随锻烧温度升高而减少,煅烧温度高于950℃时,六角晶相比例和Mn^(2+)团比例同时随锻烧温度的升高而增加.分析表明,六角晶相有利于Mn^(2+)间的间接电子自旋交换作用,在相同的掺Mn、Cu浓度条件下,对比立方晶相,它将使更多的Mn^(2+)形成团,使材料的发光亮度降低.文中还讨论了锻烧DCEL ZnS:Mn、Cu材料的最佳温度问题.
The EPR speetra. of DCEL ZnS:Mu, Cu vary with the different cal cining temperature T. Simulating the EPR spectra with microcomputer, one can calculate the relative concentration CC/C of Mn2 + clusters. As calcining temperature T grows over 950???CCCCCCCCC, the CC/C increases with T. We can conclude that formation of Mn2 + clusters is relative to the structural phase. The sixfold lattice (aaaaaaaaaaaaa phase) enhances the spin exchange interaction of Mn2+ ions and accelerates the formation of Mn2+ clusters. The luminescence intensity I decreases with the increasing relative concentration Cc/C of Mn2+ clusters.The optimal calcining temperature of DCEL ZnS:Mn, Cu powder is discussed.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1992年第4期355-362,共8页
Chinese Journal of Luminescence
