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

Chun Wei Chen, Kuei Hsien Chen, Ching Hsing Shen, Abhijit Ganguly, Li Chyong Chen, Jih Jen Wu, Hui I. Wen, Way Faung Pong

Research output: Contribution to journalArticlepeer-review

161 Citations (Scopus)

Abstract

Cathodoluminescence (CL) spectroscopy has been employed to study the electronic and optical properties of well-aligned ZnO nanorods with diameters ranging from 50 to 180 nm. 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.

Original languageEnglish
Article number241905
JournalApplied Physics Letters
Volume88
Issue number24
DOIs
Publication statusPublished - 2006 Jun 12

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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