Room temperature ultraviolet laser emission from ZnO nanocrystal thin films grown by laser MBE

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	Room temperature ultraviolet laser emission from ZnO nanocrystal thin films grown by laser MBE
	Ohtomo A.1; Kawasaki M.1; Sakurai Y.4; Yoshida Y.4; Koinuma H.1; Yu P.5; Tang Z.K.5 ; Wong G.K.L.5; Segawa Y.2
	1998-06-12
Source Publication	Materials Science and Engineering B
ISSN	09215107
Volume	54 B54 Issue:1-2 Pages:24-28
Abstract	We have observed ultraviolet laser emission from ZnO nanocrystal thin films at room temperature. ZnO films were epitaxially grown on sapphire substrates by laser molecular beam epitaxy. Closely packed and hexagonally shaped nanocrystals were formed in a spiral growth mode presumably due to a large lattice mismatch (∼ 18%) between ZnO and sapphire. Photoluminescence of these films clearly showed a sharp emission due to free excitons at room temperature. Above a threshold intensity as small as 24 kW cm of pumping laser pulses (355 nm, 15 ps), we observed stimulated emission at 3.2 eV, increasing with a power of eight as increasing pumping intensity. This emission is shown to be due to an exciton-exciton collision process. Excitons are confined in these nanocrystals to show the giant oscillator strength effect and resulting in an excitonic stimulated emission even at room temperature. © 1998 Elsevier Science S.A. All rights reserved.
Keyword	Exciton-exciton collision Laser MBE Ultraviolet laser emission ZnO nanocrystals
URL	View the original
Language	英語English
Fulltext Access	View Full-Text via Scopus
Document Type	Journal article
Collection	University of Macau
Affiliation	1.Tokyo Institute of Technology 2.RIKEN (The Institute of Physical and Chemical Research) 3.Japan Science and Technology Agency 4.Toyo University 5.Hong Kong University of Science and Technology
Recommended Citation GB/T 7714	Ohtomo A.,Kawasaki M.,Sakurai Y.,et al. Room temperature ultraviolet laser emission from ZnO nanocrystal thin films grown by laser MBE[J]. Materials Science and Engineering B, 1998, 54 B54(1-2), 24-28.
APA	Ohtomo A.., Kawasaki M.., Sakurai Y.., Yoshida Y.., Koinuma H.., Yu P.., Tang Z.K.., Wong G.K.L.., & Segawa Y. (1998). Room temperature ultraviolet laser emission from ZnO nanocrystal thin films grown by laser MBE. Materials Science and Engineering B, 54 B54(1-2), 24-28.
MLA	Ohtomo A.,et al."Room temperature ultraviolet laser emission from ZnO nanocrystal thin films grown by laser MBE".Materials Science and Engineering B 54 B54.1-2(1998):24-28.

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