Exciton related stimulated emission in ZnO polycrystalline thin film deposited by filtered cathodic vacuum arc technique

X. H. Zhang, S. J. Chua, A. M. Yong, H. D. Li, Siu Fung Yu, Shu Ping Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

Random lasing was observed from ZnO polycrystalline thin film deposited by filtered cathodic vacuum arc technique. It is found that the random lasing action results from exciton-exciton scattering process when the excitation intensity is low. However, with increasing excitation intensity, the well-resolved discrete lasing modes evolve into broad stimulated emission band due to electron-hole plasma formation when the photogenerated exciton density exceeds the Mott density. The short spontaneous emission decay time measured at low temperature suggests that the radiative recombination rate is enhanced by the nanosized ZnO grains in the polycrystalline film through exciton-light coupling.
Original languageEnglish
Article number191112
JournalApplied Physics Letters
Volume88
Issue number19
DOIs
Publication statusPublished - 23 May 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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