通过高温(1100℃)固相反应、球磨(t=0~180min)和低温(750℃)退火处理制备了平面显示用ZnS:Cu电致发光材料. 用X射线衍射、紫外-可见吸收光谱、扫描电镜、光致发光光谱对所得样品进行了分析. 在100V和400Hz条件下, 通过测试电致发光屏的性能, 研究了材料的电致发光特性. 结果表明, 球磨使得材料的一些衍射峰强度降低和峰宽增大, 吸收边也略微红移. 随球磨时间的增加, 光致发光性能下降, 球磨180 min后光致发光亮度下降了约58%, 而电致发光亮度则从14.39cd/m2(t=0min)增至最优值90.13cd/m2(t=160min). 球磨造成的荧光粉内部的微结构缺陷是导致光致和电致发光性能发生变化的根本原因.
ZnS electroluminescent phosphors were prepared by high temperature (1100℃) solid state reaction, subsequently milling for some time (t=0-180min) and the final low temperature annealing process (750℃). The as-synthesized phosphors were characterized by X-ray powder diffraction, UV-Vis diffuse reflectance spectra, scanning electron microscope and photoluminescence spectra. Electroluminescence performance was investigated on the screen-printing electroluminescent lamp at 100V and 400Hz. Increased milling time leads to intensity reductions and width increases of some diffraction peaks, and results in slight red-shifts of the absorption edges. Photoluminescence brightness declines about 58% after milling for 180 min while electroluminescence brightness increases from 14.39cd/m2(t=0min) to the peak value 90.13cd/m2(t=160min). The changes of photoluminescence and electroluminescence performances originate from the defects in the microstructure induced by milling.
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