Co-emission of UV, violet and green photoluminescence of ZnO/TiO2 thin film |
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| Authors: | Linxing Shi Hua Shen Xiangyin Li |
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| Affiliation: | a Department of Physics, Nanjing University of Science and Technology, Nanjing 210094, PR China
b Institute of Electronic Engineering and Photo-electric Technology, Nanjing University of Science and Technology, Nanjing 210094, PR China |
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| Abstract: | ZnO/TiO2 thin films were fabricated on quartz glass substrates by E-beam evaporation. The structural and optical properties were investigated by X-ray diffraction (XRD), Raman spectra, optical transmittance and photoluminescence. XRD analysis indicates that the TiO2 buffer layer can increase the preferential orientation along the (002) plane of the ZnO film. PL measurements suggest that co-emission of strong UV peak at 378 nm, violet peak at 423 nm and weak green luminescence at 544 nm is observed in the ZnO/TiO2 thin film. The violet luminescence emission at 423 nm is attributed to the interface trap in the ZnO film grain boundaries. |
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| Keywords: | ZnO TiO2 buffer layer Co-emission Luminescence Thin films |
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