Visible photoluminescence in ZnO tetrapod and multipod structures

Djurisˇic, Aleksandra B.; Leung, Yu Hang; Choy, Wallace C. H.; Cheah, Kok Wai; Chan, Wai Kin
April 2004
Applied Physics Letters;4/5/2004, Vol. 84 Issue 14, p2635
Academic Journal
The properties of ZnO tetrapod and multipod structures were investigated using scanning electron microscopy, x-ray diffraction, photoluminescence (PL), and electron paramagnetic resonance (EPR) spectroscopy. While there is relationship between g=1.96 EPR and green PL in some of the samples, this is not the case for all the samples. Therefore, the commonly assumed transition between a singly charged oxygen vacancy and photoexcited hole [K. Vanheusden, C. H. Seager, W. L. Warren, D. R. Tallant, and J. A. Voigt, Appl. Phys. Lett. 68, 403 (1996)] does not explain the green emission in all ZnO samples. The green emission likely originates from surface defects. © 2004 American Institute of Physics.


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