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Ultraviolet spontaneous and stimulated emissions from ZnO microcrystallite thin films at room temperature

Authors Zu, P.
Tang, ZK View this author's profile
Wong, GKL View this author's profile
Kawasaki, M.
Ohtomo, A.
Koinuma, H.
Segawa, Y.
Issue Date 1997
Source Solid state communications , v. 103, (8), 1997, AUG, p. 459-463
Summary Room-temperature free exciton absorption and luminescence are observed in ZnO thin films grown on sapphire substrates by the laser molecular beam epitaxy technique. At moderate optical pumping intensities, an exciton-exciton collision induced stimulated emission peak is observed at 390 nm. The existence of this peak is related to the presence of closely packed hexagonally shaped microcrystallites in these films. Stimulated emission due to electron-hole plasma recombination process is also observed at higher pumping intensities. (C) 1997 Elsevier Science Ltd.
ISSN 0038-1098
Language English
Format Article
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