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

被引：228
|
作者：
Ohtomo, A [1 ]
Tamura, K
Kawasaki, M
Makino, T
Segawa, Y
Tang, ZK
Wong, GKL
Matsumoto, Y
Koinuma, H
机构：
[1] Tokyo Inst Technol, Dept Innovat & Engn Mat, Yokohama, Kanagawa 2268502, Japan
[2] Inst Phys & Chem Res, RIKEN, Photodynam Res Ctr, Sendai, Miyagi 9800845, Japan
[3] Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[4] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan
来源：
APPLIED PHYSICS LETTERS | 2000年 / 77卷 / 14期
关键词：
D O I：
10.1063/1.1315340
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on the observation of stimulated emission in ZnO/MgxZn1-xO superlattices well above room temperature. Two kinds of superlattices grown by laser 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 well thickness and/or the Mg content in the barrier layers. The excitonic stimulated emission could be observed up to 373 K and the characteristic temperature was as high as 87 K. (C) 2000 American Institute of Physics. [S0003- 6951(00)04640-4].
引用
收藏
页码：2204 / 2206
页数：3
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