Anomalous blueshift in emission spectra of ZnO nanorods with sizes beyond quantum confinement regime | Zendy

ChunWei Chen | Zendy; KueiHsien Chen | Zendy; Ching-Hsing Shen | Zendy; Abhijit Ganguly | Zendy; LiChyong Chen | Zendy; JihJen Wu | Zendy; Huan-zhang Wen | Zendy; W. F. Pong | Zendy

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Anomalous blueshift in emission spectra of ZnO nanorods with sizes beyond quantum confinement regime

Author(s) -

ChunWei Chen,

KueiHsien Chen,

Ching-Hsing Shen,

Abhijit Ganguly,

LiChyong Chen,

JihJen Wu,

Huan-zhang Wen,

W. F. Pong

Publication year - 2006

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2211047

Subject(s) - nanorod , blueshift , cathodoluminescence , potential well , quantum dot , materials science , spectroscopy , spectral line , molecular physics , condensed matter physics , photoluminescence , chemistry , nanotechnology , optoelectronics , physics , luminescence , quantum mechanics , astronomy

Cathodoluminescence (CL) spectroscopy has been employed to study the electronic and optical properties of well-aligned ZnO nanorods with diameters ranging from 50to180nm. Single-nanorod CL studies reveal that the emission peak moves toward higher energy as the diameter of the ZnO nanorod decreases, despite that their sizes are far beyond the quantum confinement regime. Blueshift of several tens of meV in the CL peak of these nanorods has been observed. Moreover, this anomalous energy shift shows a linear relation with the inverse of the rod diameter. Possible existence of a surface resonance band is suggested and an empirical formula for this surface effect is proposed to explain the size dependence of the CL data.

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