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

被引：47

作者：

Phan, The-Long ^{[1
]}

Vincent, Roger ^{[1
]}

Cherns, David ^{[1
]}

Dan, Nguyen Huy ^{[2
]}

Yu, Seong-Cho ^{[3
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[2] Vietnam Acad Sci & Technol, Inst Mat Sci, Hanoi, Vietnam

[3] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 08期

关键词：

D O I：

10.1063/1.2968307

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2008 American Institute of Physics.

引用

页数：3

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