A structural evaluation of ZnS-based electroluminescent phosphors and devices: a comparison with performance
A structural evaluation of ZnS-based electroluminescent phosphors and devices: a comparison with performance
复制标题
ZnS基电致发光荧光粉和器件的结构评估：与性能的比较
DOI：
--
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
I. Viney
中科院分区：
文献类型：
--
作者：
A. Wright;I. Viney
摘要用透射电子显微镜（TEM）对工业和实验用的ZnS荧光粉进行了表征。荧光粉的微观结构进行了比较与光输出（强度和光谱）时，纳入交流驱动的电致发光测试灯。在TEM检查的任何样品中均未发现Cu2S沉淀的证据。还发现，当磷光体颗粒具有非常重的多重孪晶结构以及粗糙的轮廓时，获得最亮的发射，并且当它们显示立方相时，获得最少的输出。单个磷光体颗粒的电致发光输出的检查表明，发射主要来自靠近表面的材料，并表明场发射发生在由显著的表面粗糙度辅助的表面。最后，一个商业交流粉末磷光体片器件的微观结构进行了检查，也发现含有ZnS在相同的严重孪晶形式。
Abstract A number of ZnS phosphor powders, both commercial and experimental, have been characterized by transmission electron microscopy (TEM). The microstructure of the phosphors has been compared with the light output (intensity and spectra) obtained when incorporated into an ac-driven electroluminescent test lamp. No evidence has been found in any samples examined by TEM of Cu2S precipitates. It was also found that the brightest emission is obtained when the phosphor particles have a very heavily multiply twinned structure together with a rough profile, and least output when they show the cubic phase. Examination of the electroluminescence output of individual phosphor grains indicates that emission is mostly from material close to the surface and suggests that field emission occurs from the surface which is aided by a marked surface roughness. Finally, the microstructure of a commercial ac powder phosphor sheet device was examined and also found to contain ZnS in the same heavily twinned form.