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中文摘要：
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。
英文摘要：
The ZnO QDs/SiO2 composite materials, which were synthesized in different concentrations of SiOe-ethanol solution,were fabricated into light-emitting devices by spin coating. With the increase of SiO2 concentration, eleetroluminescence （EL） spectra of the devices are blue shift gradually. Experiments were designed and carried out to explore the mechanism of the spectrum-tunable EL with SiO2. The EL spectra of the series of devices, which were fabricated with the mixtures of the ZnO QDs/SiO2 sample and pure SiO2 in different molar ratios,indicate that the spectrum-tunable EL performance is not related to the emission of SiO2. The quantum size effect may be significant for the spectrum-tunable EL behavior, Gaussian multi-peak fitting for EL spectra showed that the increased ratio of green and orange-red emission with the increasing SiO2 concentration results in the blue shift of EL spectra.
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