Enhancement of multiple-phonon resonant Raman scattering in Co-doped ZnO nanorods

TL Phan, R Vincent, D Cherns, NH Dan, SC Yu

Research output: Contribution to journalArticle (Academic Journal)peer-review

42 Citations (Scopus)

Abstract

We have studied Raman scattering in Co-doped ZnO nanorods prepared by thermal diffusion. Experimental results show that the features of their non-resonant spectra are similar to Raman spectra from Co-doped ZnO materials investigated previously. Under resonant conditions, however, there is a strong enhancement of multiple-phonon Raman scattering processes. Longitudinal optical (LO)-phonon overtones up to eleventh order are observed. The modes become more obvious when the Co concentration diffused into ZnO nanorods goes to an appropriate value. This phenomenon is explained due to the shift of the band-gap energy and also due to the decrease in the intensity of near-band-edge luminescence. Our observation is in agreement with the prediction [J. F. Scott, Phys. Rev. B 2, 1209 (1970)] that the number of LO-phonon lines in ZnO is higher than that observed for CdS.
Translated title of the contributionEnhancement of multiple-phonon resonant Raman scattering in Co-doped ZnO nanorods
Original languageEnglish
Pages (from-to)082110-1 - 082110-3
Number of pages3
JournalApplied Physics Letters
Volume93(8)
DOIs
Publication statusPublished - Aug 2008

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