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Nonlinear Photoluminescence from ZnO Nanobelts |
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| Authors: | ZHOU Zhang-Kai HAO Zhong-Hua MEI Zong-Wei WEN Xiao-Gang YANG Shi-He |
| Affiliation: | Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices (Ministry of Education), Wuhan University, Wuhan 430072School of Material Science and Engineering, Sichuan University, Chengdu 610065Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
| Abstract: | The nonlinear photoluminescence (PL) including second-harmonic generation (SHG) and the multiphoton luminescence (MPL) around 385nm and 530nm from ZnO nanobelts are investigated by using near-infrared excitations. The excitation wavelength dependence of MPL intensity reveals resonant energy transfer from SHG to MPL near the band gap excitation. The lifetime measurement of the MPL shows a much slower decay process of the defect emission, which results from the generation and recombination of both donors and acceptors on the disordered surface of the ZnO nanobelts. |
| Keywords: | 42.65.Ky 42.65.Re 78.47.Jc 78.55.Et |
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