Time-resolved photoluminescence study of the stimulated emission in ZnO nanoneedles

被引：73

作者：

Kwok, WM

Djurisic, AB

Leung, YH

Chan, WK

Phillips, DL

机构：

[1] Univ Hong Kong, Dept Chem, Hong Kong, Hong Kong, Peoples R China

[2] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2005年 / 87卷 / 09期

关键词：

D O I：

10.1063/1.2035871

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

ZnO nanoneedles were fabricated by thermal evaporation of Zn nanoparticles at 800 degrees C and atmospheric pressure. The samples showed strong ultraviolet photoluminescence and weak orange defect luminescence. Time-resolved photoluminescence (TRPL) was measured using the Kerr-gated fluorescence technique in order to probe the ultrafast carrier dynamics in exciton-exciton scattering and electron hole plasma (EHP) regimes. In both regimes, the decay time of the photoluminescence is very fast (similar to 1 ps). Even though no structure is detected in the time-integrated spectra of the EHP emission, the TRPL reveals the coexistence of the excitons and free carriers. Possible reasons for the observed phenomena are discussed. (c) 2005 American Institute of Physics.

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页数：3

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