The authors would like to thank Amy Wong and Wing Song Lee for SEM measurements, and Dr. J. Gao for XRD measurements. This work is supported by the University Research Committee seed funding grant of the University of Hong Kong.
Photoluminescence and Electron Paramagnetic Resonance of ZnO Tetrapod Structures†
Article first published online: 29 SEP 2004
Copyright © 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 14, Issue 9, pages 856–864, September, 2004
How to Cite
Djurišić, A. B., Choy, W. C. H., Roy, V. A. L., Leung, Y. H., Kwong, C. Y., Cheah, K. W., Gundu Rao, T. K., Chan, W. K., Fei Lui, H. and Surya, C. (2004), Photoluminescence and Electron Paramagnetic Resonance of ZnO Tetrapod Structures. Adv. Funct. Mater., 14: 856–864. doi: 10.1002/adfm.200305082
- Issue published online: 29 SEP 2004
- Article first published online: 29 SEP 2004
- Manuscript Accepted: 16 FEB 2004
- Manuscript Received: 9 OCT 2003
- Electron paramagnetic resonance (EPR) spectroscopy;
- Tetrapod nanostructures;
- Zinc oxide
ZnO tetrapod nanostructures have been prepared by the evaporation of Zn in air (no flow), dry and humid argon flow, and dry and humid nitrogen flow. Their properties have been investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD), photoluminescence (PL) and photoluminescence excitation (PLE) spectroscopies (at different temperatures), and electron paramagnetic resonance (EPR) spectroscopy at –160 °C and room temperature. It is found that the fabrication conditions significantly influence the EPR and PL spectra obtained. While a g = 1.96 EPR signal is present in some of the samples, green PL emission can be observed from all the samples. Therefore, the green emission in our samples does not originate from the commonly assumed transition between a singly charged oxygen vacancy and a photoexcited hole [K. Vanheusden, C. H. Seager, W. L. Warren, D. R. Tallant, J. A. Voigt, Appl. Phys. Lett. 1996, 68, 403]. However, the green emission can be suppressed by coating the nanostructures with a surfactant for all fabrication conditions, which indicates that this emission originates from surface defects.