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中文摘要：
将ZnS／SiO2量子点与PVP在甲醇溶液中充分混合作为活性层材料，通过匀胶方法制备了ITO／／ZnS／SiO2：PVP／／Al结构的电致发光（EL）薄膜器件。器件的EL光谱由510～560nm波段的绿光发射和相对较弱的蓝紫光（400nm左右）发射组成，通过对发光光谱的分析发现，上述两个区域的发射均来自ZnS的缺陷能级。其中，绿色发光峰来源于较低能态的缺陷能级；而高能区域的蓝色发光则是由于高能态的缺陷能级俘获电子的几率增大，在这过程中，PVP形成的能级阶梯有效增加了高能态缺陷能级俘获电子的几率，提升了高能波段的发光效率，相应地，器件的色坐标也随之从（0．37，0．42）变化到（0．30，0．34），趋于白光发射。
英文摘要：
An electrol （EL） device with structure of ITO//ZnS/SiO2 ： PVP//Al was fabri cated by spin coating with the mixing solution of ZnS/SiO2 quantum dots （QDs） and PVP. The EL emission spectrum consists of green emission in 510--560 nm and weak violet emission around 400 nm. Through analyzing the EL spectrum we find that the above two emissions both come from the defect energy level of ZnS,where the green emission peak is due to the lower defect energy level,while the violet emission is from the higher defect energy level which can trap electrons more easily. During the process, the energy level step formed by PVP can enhance the probability of trapping electrons effectively for the higher defect energy level, the luminous efficiency of higher energy band is increased, and the color coordinate of devices varies from （0. 37,0. 42） to （0.30,0.34） ,approaching to white light emission.
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