Room-temperature stimulated emission of excitons in ZnO/(Mg, Zn)O superlattices

Citation
A. Ohtomo et al., Room-temperature stimulated emission of excitons in ZnO/(Mg, Zn)O superlattices, APPL PHYS L, 77(14), 2000, pp. 2204-2206
Citations number
18
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
77
Issue
14
Year of publication
2000
Pages
2204 - 2206
Database
ISI
SICI code
0003-6951(20001002)77:14<2204:RSEOEI>2.0.ZU;2-H
Abstract
We report on the observation of stimulated emission in ZnO/MgxZn1-xO superl attices well above room temperature. Two kinds of superlattices grown by la ser molecular-beam epitaxy showed clear systematics on the quantum subband levels in absorption and spontaneous emission spectra. Stimulated emission with excitonic origin could be observed at very low optical pumping levels. The threshold excitation intensity changed from 11 to 40 kW/cm(2), and the emission energy could be tuned between 3.2 and 3.4 eV, depending on the we ll thickness and/or the Mg content in the barrier layers. The excitonic sti mulated emission could be observed up to 373 K and the characteristic tempe rature was as high as 87 K. (C) 2000 American Institute of Physics. [S0003- 6951(00)04640-4].