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

Research output: Contribution to journalArticlepeer-review

499 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)856-864
Number of pages9
JournalAdvanced Functional Materials
Volume14
Issue number9
DOIs
Publication statusPublished - Sep 1 2004
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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