Size dependence of exciton-phonon coupling in sol-gel ZnMgO powders

C. H. Chia, J. N. Chen, T. C. Han, J. W. Chiou, Y. C. Lin, W. L. Hsu, Wu-Ching Chou

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We found that the exciton-phonon coupling in the Zn1-xMg xO powders (0.01 x 0.07) is greatly influenced by the crystalline-size. Two well-resolved photoluminescence (PL) bands due to recombination of free exciton and its longitudinal optical (LO)-phonon replicas enable us to analyze the relative intensities among free excitons, one-LO-phonon replicas, and two-LO-phonon replicas. As crystalline size increases, a larger enhancement of the PL-intensity ratio of a free exciton to its LO-phonon replicas was found compared to that of two LO-phonon replica to one-LO-phonon replica.

Original languageEnglish
Article number063526
JournalJournal of Applied Physics
Issue number6
StatePublished - 15 Mar 2011

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