Luminescence Properties of ZnO Whiskers Obtained by Chemical Vapor Deposition
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概要
- 論文の詳細を見る
Luminescence properties of highly (0001) oriented ZnO whiskers obtained by atmospheric chemical vapor deposition have been investigated over wide temperature range of 12 K to 300 K. An ultraviolet emission associated with bound-exciton recombination has been observed at 12 K under the low power photoexcitation. The emission exhibited temperature quenching with an activation energy of ${\sim}9$ meV, which is treated as the binding energy of the bound exciton. The shape of the emission was considerably modified at high-power UV laser excitation. The principal feature of this modification is an occurrence of a series of equally spaced, narrow emission components, decreasing in intensity at longer wavelength. The separation between these components is found to correspond to the energy of a longitudinal optical phonon (${\sim}70$ meV) determined by Raman scattering measurements. The activation energy of the temperature quenching of the emission considerably enhanced up to ${\sim}58$ meV under the laser excitation. This enhancement of the activation energy is discussed as being due to the domination of the free-exciton emission in the photoluminescense spectra under the high-power excitation. The balance between free- and bound-exciton states is discussed in terms of exciton generation and the annihilation scheme.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2003-06-15
著者
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Saitoh Hidetoshi
Nagaoka University Of Technology
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NAJAFOV Hikmat
Nagaoka University of Technology
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OHSHIO Shigeo
Nagaoka University of Technology
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FUKADA Yusuke
Nagaoka University of Technology
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Iida Seishi
Nagaoka Univerity Of Technology Kamitomioka
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Ohshio Shigeo
Nagaoka University of Technology, Nagaoka 940-2188, Japan
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Najafov Hikmat
Nagaoka University of Technology, Nagaoka 940-2188, Japan
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Iida Seishi
Nagaoka University of Technology, Nagaoka 940-2188, Japan
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Saitoh Hidetoshi
Nagaoka University of Technology, Nagaoka 940-2188, Japan
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Fukada Yusuke
Nagaoka University of Technology, Nagaoka 940-2188, Japan
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