High-excitation effect on photoluminescence of sol-gel ZnO nanopowder

C. H. Chia, Y. J. Lai, T. C. Han, J. W. Chiou, Y. M. Hu, Wu-Ching Chou

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We studied the power-dependent photoluminescence of ZnO nanopowder grown by sol-gel method at low temperature. At moderate optical pumping intensity, two nonlinear emission bands due to the radiative recombination of free biexciton and the inelastic exciton-exciton scattering were detected. We found that the threshold of the excitation density for the emergence of the nonlinear emission bands is low (<18 W/cm 2 ) in sol-gel ZnO nanopowders.

Original languageEnglish
Article number081903
JournalApplied Physics Letters
Issue number8
StatePublished - 12 Mar 2010

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