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Title:
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Temperature dependence of near ultraviolet photoluminescence in ZnO/(Mg, Zn)O multiple quantum wells.
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Author:
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Makino, T.; Tuan, N. T.; Sun, Handong.; Chia, C. H.; Segawa, Y.; Kawasaki, M.; Ohtomo, A.; Tamura, K.; Koinuma, H.
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Copyright year:
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2001 |
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Abstract:
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We report on temperature dependence of excitonic photoluminescence (PL) from ZnO/(Mg, Zn)O multiple quantum wells (MQWs). Two kinds of MQWs having different barrier heights grown by laser molecular-beam epitaxy showed significantly different temperature dependences of PL spectra; in ZnO/Mg0.27Zn0.73O MQWs, the PL peak energy at 50–200 K was a monotonically increasing function of temperature, which was opposite to that ascribed by band gap shrinkage. Moreover, spectra taken at 95–200 K encompassed two peaks, both of which originated from recombination of localized excitons. The temperature-induced shift (redshift-blueshift-peak duplication-redshift) At 5–300 K is caused by a change in the exciton dynamics with increasing temperature due to inhomogeneity and the exciton localization effect. On the other hand, the corresponding dependence in ZnO/Mg0.12Zn0.88O MQWs (lower barrier height) was similar to that in bulk II–VI semiconductors. |
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Subject:
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DRNTU::Science::Physics::Optics and light. |
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Type:
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Journal Article |
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Series/ Journal Title:
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Applied Physics Letters. |
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School:
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School of Physical and Mathematical Sciences |
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Rights:
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Applied Physics Letters © copyright 2001 American Institute of Physics. The journal's website is located at http://apl.aip.org/. |
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Version:
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Published version |
