一种新的长余辉阴极射线磷光体-SrAl2O4:Dy3+

本文介绍了一种新合成的长余辉阴极射线磷光体--SrAl2O4:Dy3+.在室温下,用10kv、1μA/cm2阴极射线激发磷光体时,其发射光谱由三组分立的锐线构成,系属Dy3+离子4f-4f跃迁的特征发射;发光呈黄白色,发光亮度可以同商用MgF2,Mn2+(P33)相比较,大约为Zn2SiO4:Mn2+、As(P39)亮度的60%.当阴极射线激发去除以后,磷光体的发光强度衰减到起始值的1/10的时间(通称余辉时间)长达200ms以上.发光衰减是非指数式的.阴极射线激发以后的热释发光表明:在磷光体中存在着构成慢衰减过程的深陷阱. 最后,根据实验结果,提出了这种磷光体发光衰减过程的物理模型.

A NEW CATHODOLUMINOPHOR WITH LONG PERSISTENCE

A new synthetic cathodoluminophor with long Persistence, Dy3+ activated SrAl2O4 is presented in this Paper. The CL spectrum consists of three groups of discrete sharp lines which is characteristic of Dy3+ ion 4f-4f transfer appearing yellow-white in color. The CL brightness is comparable to commercial MgF2:Mn2+(P33),or about 60% that of Zn2SiO4:Mn2+,As(P39).The SrAl2O4:Dy3+ phosphor shows a decay time of more than 200ms to decrease to an intensity of 1/10 of its initial value after the removal of CR excitation of 10kV, 1μA/cm2 and the luminescence decay is nonexponential. Thermoluminescence of CR excitation shows the existence of deep traps which are responsible for the slow decay.Finally the model of luminescence decay in this phosphor is proposed according to experimental results.