Green emission in ZnO nanostructures - Examination of the roles of oxygen and zinc vacancies

Y. H. Leung, X. Y. Chen, A. M.C. Ng, M. Y. Guo, F. Z. Liu, A. B. Djurišić*, W. K. Chan, X. Q. Shi, M. A. VAN HOVE

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Green defect emission is commonly observed in ZnO nanostructures. It is frequently attributed to oxygen vacancies and used to evaluate performance and study physical mechanisms in a variety of applications, such as gas sensing and photocatalysis. However, competing hypotheses have been proposed to explain green emission, which raises questions about the role of oxygen vacancies in sensing and photocatalytic processes. The major problem in correct experimental identification of defects in ZnO is the abundance of defects present, while theoretically there are problems with accurate calculation of a defect energy level in the gap. Thus, here we adopted a different approach and studied experimentally and theoretically the interaction of ZnO with different chemical substances (hydrogen and a silane-based molecule). Based on theoretical predictions and experimental results, we can conclude that green emission can likely be assigned to defect complexes, which may contain zinc vacancies.

Original languageEnglish
Pages (from-to)202-209
Number of pages8
JournalApplied Surface Science
Volume271
DOIs
Publication statusPublished - 15 Apr 2013

Scopus Subject Areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

User-Defined Keywords

  • Green emission
  • Nanostructures
  • Photoluminescence
  • ZnO

Fingerprint

Dive into the research topics of 'Green emission in ZnO nanostructures - Examination of the roles of oxygen and zinc vacancies'. Together they form a unique fingerprint.

Cite this