高分子凝胶法蓝色发光ZnS微晶的制备及形成机理  

Preparation and Growth Mechanism of Blue Light-emitting ZnS Microcrystals by High Polymer-gel Method

作　　者：陈宗高[1] 李冬梅[1] 桑文斌[1] 闵嘉华[1] 王灵玲[1] 徐慧超[1] 陈建明[2] 毛日华[2] 

机构地区：[1]上海大学嘉定校区无机非金属材料系,上海201800 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《人工晶体学报》2001年第4期348-353,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金资助项目 (No.6 98710 17)

摘　　要：本研究采用高分子凝胶法在聚乙烯醇基体上制备了ZnS微晶。常温下 ,采用金相显微镜、X射线衍射仪及荧光分光光度计对样品进行了表征。结果表明 ,PVA膜中的微晶分布均匀 ,粒径大小为 0 .2～ 1μm。微晶具有明显的立方相结构 ,衍射峰有宽化现象。发现PL光谱的激发峰与发射峰都为双峰结构 ,发射最高峰在 4 4 0nm处 ,半高宽为 5 0nm左右。在紫外灯照射下 ,肉眼观看该薄膜样品 ,发出耀眼的蓝光。探讨了微晶在聚乙烯醇稳定剂中的形成机理 ,聚乙烯醇在体系中起着包覆。Zinc sulfide microcrystals have been successfully synthesized by high polymer gel method in poly(vinyl alcohol)(PVA) polymer matrix.The samples have been characterized by X ray diffractometer,photo microscope and photoluminescence spectrometer at room temperature.The results show that the diameters of ZnS microcrystals obtained are about 0.2? ?μm,and these particles are well distributed in PVA matrix.The X ray diffraction demonstrates that the ZnS microcrystals have a cubic structure,and the widening diffraction peaks are observed. PL spectra show that the highest peak is at 440nm and the half width is about 50nm.Both excitation peaks and emission peaks have double peaks.The film sample emits brilliant blue light under ultraviolet light by naked eyes.A possible growth mechanism of the ZnS microcrystals in a PVA film has been discussed.PVA matrix acts as a stable,capping,surface modified agent.

关 键 词：高分子凝胶法 硫化锌微晶 蓝光 ZNS 制备 形成机理 

分 类 号：O78[理学—晶体学] O614.241