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Photoluminescence and time‐resolved photoluminescence spectra of annealed ZnO fine particles with ∼20 nm size have been investigated at 12 K. In unannealed raw ZnO particles, luminescence bands attributed to free‐exciton recombination accompanied by LO phonon emission (LO phonon replica) are dominant in the band‐edge luminescence. For annealed ZnO particles, the intensities of the LO phonon replica become weaker than that of bound exciton band, and the bandwidths of the exciton bands become narrower with the annealing temperature. The time‐resolved luminescence spectra have revealed that the decay times of bound and free excitons become longer for annealed particles. These facts suggest that ZnO particles are aggregated each other even at temperatures well below the melting point. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Danhara et al. (2006) studied this question.
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