Journal
APPLIED PHYSICS LETTERS
Volume 77, Issue 15, Pages 2322-2324Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1316069
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We have studied ultraviolet photoluminescence from high-purity zinc-oxide powder over a wide temperature range (2-293 K). At low temperatures, the spontaneous emission is due to radiative recombination of excitons bound to donors and acceptors. At high temperature (> 90 K), it mainly consists of recombination of free excitons, with exciton-exciton collision-induced recombination dominating the spectrum at higher pumping intensities. Emission from the exciton-exciton collision process shows clear stimulated-emission behavior. At sufficiently high pumping intensity, the stimulated emission band shifts abruptly to a longer wavelength due to the formation of an electron-hole plasma. Sharp emission peaks are observed in the stimulated emission bands. The possible origins of these sharp peaks are discussed. (C) 2000 American Institute of Physics. [S0003-6951(00)01341-3].
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