激活剂Cu和Mn对ZnS相变和微结构的影响

EFFECT OF ACTIVATOR Cu OR Mn ON PHASE TRANSITION AND MICROSTRUCTURE OF ZnS

为了深入研究交流粉末电致发光粉的发光机理,增加对荧光粉激发能量的输入,提高它的发光亮度,研究这种材料的微结构极为必要。但要在原子尺度上研究材料的结构和成分,目前仍十分困难。至今,人们对电致发光机理还没有统一认识,不能不说与此有关。

Studies on the structure phase transition and microstructure of ZnS:Cu and ZnS:Mn by X-ray powder diffraction analysis (XPDA) , electron spin resonance (ESR) and high resolution electron microscopy (HREM)show that: (A) the phase transition temperature of ZnS is shifted obviously to higher value when the concentration of Cu is greater than 1XXXXXXXX10-3 or to lower value when the concentration of Mn is greater than 1XXXXXXXXX10-3;(B)for ZnS:Cu 2XXXXXX10-3(calcined at 900????CCCCCCCCCC),there mainly exist 180??????????? rotation twins of BBBBBBBBB-phase; (C) for ZnS:Mn 5XXXXXXXX10-3 (calcined at 900???CCCCCCCC)there mainly exists the coherent growth of BBBBBBBB-phase (180??????????? rotation twins) and aaaaaaaaaa-phase at micro-area in atomic scale; and (D) twin boundary areas and crystal streaks are rich in Cu.