Phonon replicas in ZnO/ZnMgO multiquantum wells

被引：34
作者：
Sun, HD
Segawa, Y
Kawasaki, M
Ohtomo, A
Tamura, K
Koinuma, H
机构：
[1] RIKEN, Inst Phys & Chem Res, Photodynam Res Ctr, Sendai, Miyagi 5191399, Japan
[2] Univ Strathclyde, Inst Photon, Wolfson Ctr, Glasgow G4 0NW, Lanark, Scotland
[3] Tokyo Inst Technol, Dept Innovat & Engineered Mat, Yokohama, Kanagawa 2268502, Japan
[4] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2002年 / 91卷 / 10期
关键词：
D O I：
10.1063/1.1467627
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The photoluminescence properties of ZnO/ZnMgO multiquantum wells have been investigated by continuous and time-resolved photoluminescence spectra at various temperatures. Strong first-order and second-order longitudinal optical (LO)-phonon replicas were observed in the emission spectra. Both the zero-phonon emission and its LO-phonon replicas can be resolved into two components with different temperature dependence. The observation of LO-phonon replicas provided an additional way to characterize the recombination mechanism in quantum wells. Two kinds of excitons are responsible for the resolved emission components and have different coupling strength with LO phonons: one is donor bound excitons which dominated at low temperatures, the other one is the localized excitons due to the well width fluctuation which took over the dominated emission at high temperatures. (C) 2002 American Institute of Physics.
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页码：6457 / 6460
页数：4
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