摘要
The nonlinear photoluminescence （PL） including second-harmonic generation （SHG） and the multiphoton luminescence （MPL） around 385 nm and 530 nm 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.
The nonlinear photoluminescence （PL） including second-harmonic generation （SHG） and the multiphoton luminescence （MPL） around 385 nm and 530 nm 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.
基金
Supported by the National Basic Research Programme of China under Grant No 2007CB935300, the National Natural Science Foundation of China under Grant No 10534030, and the Young Research Funding of Sichuan Province under Grant No 07ZQ026-001.
