Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9586213 | Journal of Luminescence | 2005 | 4 Pages |
Abstract
Luminescence and time-resolved luminescence spectra of ZnO particles with the size of â¼20Â nm have been investigated under band-to-band excitation. In the ultraviolet spectral region, there appear broad luminescence bands at 367.6, 368.8, 374.5 and 381.9Â nm at 10Â K. Decay profiles at 369 and 374Â nm exhibit two decay components. The decay times are â¼20 and â¼100Â ps for 369Â nm, and â¼40 and â¼400Â ps for 374Â nm. These luminescence bands are attributable to the radiative recombination of free and bound excitons. Based on the present results, the effects of surface states and defects on excitons in mesoscopic ZnO particles have been discussed.
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Authors
T. Hirai, Y. Harada, S. Hashimoto, T. Itoh, N. Ohno,