Photoluminescence properties and morphologies of submicron-sized ZnO crystals prepared by ultrasonic spray pyrolysis
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概要
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Spectral features of the near-band-edge photoluminescence (PL) of submicron-sized ZnO crystals such as nanoplatelets, nanowires, and nanorods grown by an ultrasonic spray pyrolysis (USP) technique were investigated. The measurements of time-integrated and time-resolved PL spectra were performed in the temperature range of 8–300 K under various excitation densities by using the fourth harmonics (4.66 eV) of a Nd:YAG laser. Exciton-related emission bands were clearly observed in the ZnO crystals having different morphologies. In nanoplatelets, an emission band originating from radiative recombination of donor–acceptor pairs was also found at around 3.17 eV, indicating the existence of acceptor centers. The binding energies of donor and acceptor were about 53 and 200 meV, respectively. In nanowires, the intensity of an emission band peaking at 3.32 eV obeyed a quadratic dependency on the density of excitation. This fact shows that an inelastic exciton–exciton scattering process is efficient in the nanowires because of high crystal quality.
- INST PURE APPLIED PHYSICSの論文
- 2008-01-25
著者
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Itoh Minoru
Department Of Animal Husbandry Faculty Of Agriculture Tohoku University:(present Adress) National In
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Htay Myo
Department Of Electrical And Electronic Engineering Faculty Of Engineering Shinshu University
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Ito K
Department Of Advanced Materials Science Graduate School Of Frontier Sciences University Of Tokyo
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Hashimoto Yoshio
Department Of Anesthesiology University Of Hirosaki School Of Medicine
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Itoh Minoru
Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
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