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采用溶胶-凝胶技术在玻璃衬底上制备了ZnO薄膜和ZnO-SiO2复合膜.原子力显微镜照片显示ZnO薄膜具有球状纳米晶粒;可见光-紫外透射光谱表明ZnO-SiO2复合膜在可见光区的透过率大约是85%,透过率从330nm开始下降,到290nm附近降为零.由于量子效应,吸收边出现明显的蓝移.在室温下用不同波长的光激发ZnO-SiO2复合膜,光致发光谱显示ZnO-SiO2复合膜对应于激子发射的290nm附近的紫外发光峰与透射谱所显示的吸收边位置一致,没有出现斯托克斯红移.同时,ZnO-SiO2复合膜出现了双光子和三光子吸收现象和上转换发光现象.
ZnO thin films and ZnO-SiO2 composite films were prepared by sol-gel technique on glass substrates. The atomic force microscopy images showed that the ZnO films had spherical nanocrystalline grains. The visible-UV transmission spectra showed that the ZnO-SiO2 composite films were transparent in visible light The pass rate is about 85%, and the transmittance drops from 330nm to zero near 290nm. Due to the quantum effect, a significant blue shift appears at the absorption edge. At room temperature, ZnO-SiO2 composite films are excited by light of different wavelengths, Photoluminescence spectra showed that the UV-light emission peak near 290nm corresponding to the exciton emission was consistent with the absorption edge position shown by the transmission spectrum, and no Stokes shift occurred at the same time. The ZnO-SiO2 composite film appeared Two-photon and three-photon absorption phenomena and up-conversion luminescence.