Photoluminescent characteristics of ZnO nanorods and ZnO/ZnMgO nanorod heterostructures

Gyu Chul Yi, Won Il Park, Jinkyoung Yoo, Dong Wook Kim, Taiha Joo, T. Yatsui, J. Lim, M. Ohtsu

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

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.

Original languageEnglish
Article number601301
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume6013
DOIs
StatePublished - 2005
EventOptoelectronic Devices: Physics, Fabrication, and Application II - Boston, MA, United States
Duration: 24 Oct 200525 Oct 2005

Keywords

  • Nanorods
  • Photoluminescence
  • Quantum structures
  • ZnO

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