ULTRAVIOLET SPONTANEOUS AND STIMULATED EMISSIONS FROM ZNO MICROCRYSTALLITE THIN-FILMS AT ROOM-TEMPERATURE

Authors
ZU P TANG ZK WONG GKL KAWASAKI M OHTOMO A KOINUMA H SEGAWA Y
Citation
P. Zu et al., ULTRAVIOLET SPONTANEOUS AND STIMULATED EMISSIONS FROM ZNO MICROCRYSTALLITE THIN-FILMS AT ROOM-TEMPERATURE, Solid state communications, 103(8), 1997, pp. 459-463
Citations number
23
Categorie Soggetti
Physics, Condensed Matter
Journal title
Solid state communications → ACNP
ISSN journal
00381098
Volume
103
Issue
8
Year of publication
1997
Pages
459 - 463
Database
ISI
SICI code
0038-1098(1997)103:8<459:USASEF>2.0.ZU;2-X
Abstract
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 e xciton-exciton collision induced stimulated emission peak is observed at 390 nm. The existence of this peak is related to the presence of cl osely packed hexagonally shaped microcrystallites in these films. Stim ulated emission due to electron-hole plasma recombination process is a lso observed at higher pumping intensities. (C) 1997 Elsevier Science Ltd.