Effects of charge compensation on red emission in CaYAl3OT7：Eu3＋ phosphor

Monovalent ions Li＋, Na＋, and K＋, as charge compensators, are introduced into CaYA1307： M （M = Eu3＋, Ce~＋） in this letter. Their crystal phases and photoluminescence properties of different alkali metal ions doped in CaYA1307 are investigated. In addition, the influence of charge compensation ion Li＋ which has a more obvious role in improving luminescence intensity on CaYA1307： Eu3＋ phosphor is intentionally discussed in detail and a possible mechanism of charge compensation is given. The enhancement of red emission centered at 618 nm belonging to Eu3＋ is achieved by adding alkali metal ion Li＋ under 393-nm excitation.     

反射镜补偿检验

在光学加工中,反射镜可以很好地补偿待检镜,解决加工中的一些难题。通过三级像差理论求解反射镜补偿检验二次曲面的初始结构参量,令球差系数∑S1=0,补偿镜e21可选择球面或椭球面,推导出补偿镜和待检镜之间关系的表示式e。21=0、0.1、0.2、0.3、0.4,按公式画出e22/α~β,αr02/r01~β的曲线图,从中确定β∝α,e21,e22,r01,r02,d12的对应关系,解出补偿检验的初始结构参量,分析补偿镜放置待检镜曲率中心前α>0,α>1和后α<0、β≥0,β≤0对应待检镜的e22各种求解。分析看出:这包括了补偿检验的全部功能,对凸和凹的二次曲面都可以进行补偿检验,其中有以前提出的解,也有以前没有发现的解,对补偿检验的全面分析是非常有益的。