25 October 2005 Photoluminescent characteristics of ZnO nanorods and ZnO/ZnMgO nanorod heterostructures
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Abstract
We report on photoluminescent properties of ultrafine ZnO nanorods and ZnO/Zn0.8Mg0.2O nanorod quantum-well structures. The catalyst-free metalorganic chemical vapor deposition (MOCVD) technique enables control of ZnO nanorod diameters in the range of 5 to 150 nm. From the PL spectra of ultrafine ZnO nanorods with a mean diameter smaller than 10 nm, a systematic blue-shift in their PL peak position was observed by decreasing their diameter, presumably due to the quantum confinement effect along the radial direction in ZnO nanorods. In addition, we obtained time-integrated and time-resolved PL spectra of ZnO/Zn0.8Mg0.2O nanorod single-quantum-well structures (SQWs) in the temperature range of 10 K to 300 K. The nanorod SQWs also showed a PL blue-shift and the energy shift was dependent on ZnO well layer width. The PL peak position shift originates from the quantum confinement effect of carriers in nanorod quantum structures. Furthermore, we investigated spatially-resolved PL spectra of individual nanorod SQWs using scanning near-field optical microscopy.
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Gyu-Chul Yi, Gyu-Chul Yi, Won Il Park, Won Il Park, Jinkyoung Yoo, Jinkyoung Yoo, Dong-Wook Kim, Dong-Wook Kim, Taiha Joo, Taiha Joo, T. Yatsui, T. Yatsui, J. Lim, J. Lim, M. Ohtsu, M. Ohtsu, } "Photoluminescent characteristics of ZnO nanorods and ZnO/ZnMgO nanorod heterostructures", Proc. SPIE 6013, Optoelectronic Devices: Physics, Fabrication, and Application II, 601301 (25 October 2005); doi: 10.1117/12.631517; https://doi.org/10.1117/12.631517
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