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Title:
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Room-temperature luminescence of excitons in ZnO/(Mg,Zn)O multiple-quantum wells on lattice-matched substrates.
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Author:
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Makino, T.; Chia, C. H.; Tuan, N. T.; Sun, Handong.; Segawa, Y.; Kawasaki, M.; Ohtomo, A.; Tamura, K.; Koinuma, H.
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Copyright year:
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2000 |
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Abstract:
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We report on the optical properties of ZnO/(Mg, Zn)O multiple quantum wells (MQWs) on lattice-matched ScAlMgO4 substrates fabricated by laser molecular-beam epitaxy. As the well layer thickness decreased down to 7 Å, the photoluminescence (PL) and absorption peaks showed a systematic blueshift, consistent with the quantum-size effect. Moreover, a bright PL of free excitons could be observed even at room temperature. As a result, the PL could be tuned in the energy range of 3.3–3.6 eV by choosing the appropriate barrier height and well layer thickness. The widest tunability on the room-temperature luminescence of the excitons could be attained on the basis of the ZnO quantum structure. These favorable properties could not be attained in the MQWs on lattice-mismatched sapphire substrates. |
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Subject:
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DRNTU::Science::Physics. |
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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 2000 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 |
