Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structures

Aleksandra B. Djurišić; Wallace C. H. Choy; Vellaisamy Arul Lenus Roy; Yu Hang Leung; Chung Yin Kwong; Kok Wai Cheah; Tumkur Krishnaswamy Gundu Rao; Wai Kin Chan; Hsian Fei Lui; Charles Surya

doi:10.1002/adfm.200305082

Author(s)

Aleksandra B. Djurišić
Wallace C. H. Choy
Yu Hang Leung
Chung Yin Kwong
Kok Wai Cheah
Tumkur Krishnaswamy Gundu Rao
Wai Kin Chan
Hsian Fei Lui
Charles Surya

Detail(s)

Original language	English
Pages (from-to)	856-864
Journal / Publication	Advanced Functional Materials
Volume	14
Issue number	9
Publication status	Published - Sept 2004
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1002/adfm.200305082 Final Published version
	Check@CityULib
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-6444233032&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(5282b84c-c200-49ef-b371-efc779912832).html

Abstract

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.

Citation Format(s)

[ RIS ] [ BibTeX ]

Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structures. / Djurišić, Aleksandra B.; Choy, Wallace C. H.; Roy, Vellaisamy Arul Lenus et al.
In: Advanced Functional Materials, Vol. 14, No. 9, 09.2004, p. 856-864.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Djurišić, AB, Choy, WCH, Roy, VAL, Leung, YH, Kwong, CY, Cheah, KW, Rao, TKG, Chan, WK, Lui, HF & Surya, C 2004, 'Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structures', Advanced Functional Materials, vol. 14, no. 9, pp. 856-864. https://doi.org/10.1002/adfm.200305082

Djurišić, A. B., Choy, W. C. H., Roy, V. A. L., Leung, Y. H., Kwong, C. Y., Cheah, K. W., Rao, T. K. G., Chan, W. K., Lui, H. F., & Surya, C. (2004). Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structures. Advanced Functional Materials, 14(9), 856-864. https://doi.org/10.1002/adfm.200305082

Djurišić AB, Choy WCH, Roy VAL, Leung YH, Kwong CY, Cheah KW et al. Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structures. Advanced Functional Materials. 2004 Sept;14(9):856-864. doi: 10.1002/adfm.200305082

Djurišić, Aleksandra B. ; Choy, Wallace C. H. ; Roy, Vellaisamy Arul Lenus et al. / Photoluminescence and electron paramagnetic resonance of ZnO tetrapod structures. In: Advanced Functional Materials. 2004 ; Vol. 14, No. 9. pp. 856-864.