Time-resolved photoluminescence study of the stimulated emission in ZnO nanoneedles
作者： Wai Ming Kwok , AB Djurišić , YH Leung , WK Chan , DL Phillips
DOI: 10.1063/1.2035871
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摘要: ZnO nanoneedles were fabricated by thermal evaporation of Zn nanoparticles at 800 °C and atmospheric pressure. The samples showed strong ultraviolet photoluminescence weak orange defect luminescence. Time-resolved (TRPL) was measured using the Kerr-gated fluorescence technique in order to probe ultrafast carrier dynamics exciton-exciton scattering electron hole plasma (EHP) regimes. In both regimes, decay time is very fast (∼1ps). Even though no structure detected time-integrated spectra EHP emission, TRPL reveals coexistence excitons free carriers. Possible reasons for observed phenomena are discussed.
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