Excitonic gain and stimulated ultraviolet emission in nanocrystalline zinc-oxide powder

Y. Sun*, J. B. Ketterson, G. K.L. Wong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

123 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2322-2324
Number of pages3
JournalApplied Physics Letters
Issue number15
StatePublished - Oct 9 2000

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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