Nonlinear Photoluminescence from ZnO Nanobelts

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2009,（2）
• 页码范围: 115-118
• 页数: 4页
• 语种: 英文

摘要

The nonlinear photoluminescence (PL) including second-harmonic generation (SHG) and the multiphoton lumi-nescence (MPL) around 385 nm and 530 nm from ZnO nanobelts are investigated by using near-infrared excita-tions. 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.