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在不同浓度的SiO2乙醇溶液中制备了一系列ZnO量子点/SiO2复合材料,通过匀胶方法将其制备成复合薄膜器件。器件的电致发光(EL)随着SiO2浓度的增加逐渐蓝移。通过实验,探索了发生蓝移的机制。选取一种ZnO量子点/SiO2复合材料均匀混入不同质量的纯SiO2后,测试结果表明,该蓝移现象不是SiO2自身发光引起的。通过样品的X射线衍射(XRD)数据分析表明,ZnO量子点尺寸随SiO2浓度增加而减小,证实了量子尺寸效应是蓝移的原因之一。同时,进行多峰高斯拟合还发现,随着SiO2浓度的增加,绿光和橙红光发射峰比例随之增加,进一步证实了量子尺寸效应导致了复合器件的光谱蓝移。
A series of ZnO quantum dots / SiO2 composites were prepared in different concentration of ethanol solution of SiO2, and were prepared into composite thin film devices by spinodal method. The electroluminescence (EL) of the device gradually blue-shifted with the increase of SiO2 concentration. Through experiments, we explore the mechanism of blue shift. After selecting a kind of ZnO quantum dot / SiO2 composite material to mix pure SiO2 with different mass, the test results show that the blue shift phenomenon is not caused by SiO2 self-luminescence. The X-ray diffraction (XRD) data analysis of the samples shows that the size of ZnO quantum dots decreases with the increase of SiO2 concentration, confirming that the quantum size effect is one of the reasons for the blue shift. At the same time, multi-peak Gaussian fitting also found that with the increase of SiO2 concentration, the proportion of green and orange red emission peaks increases, which further confirms that the quantum size effect leads to the blue shift of the spectrum of the composite device.