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

doi:10.1063/1.2211047

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

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

178 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 language	English
Article number	241905
Journal	Applied Physics Letters
Volume	88
Issue number	24
DOIs	https://doi.org/10.1063/1.2211047
Publication status	Published - 2006 Jun 12

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2211047

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title = "Anomalous blueshift in emission spectra of ZnO nanorods with sizes beyond quantum confinement regime",

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.",

author = "Chen, {Chun Wei} and Chen, {Kuei Hsien} and Shen, {Ching Hsing} and Abhijit Ganguly and Chen, {Li Chyong} and Wu, {Jih Jen} and Wen, {Hui I.} and Pong, {Way Faung}",

note = "Funding Information: The authors would like to acknowledge Academia Sinica, the Ministry of Education, and National Science Council, Taiwan for financial support of this research.",

year = "2006",

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doi = "10.1063/1.2211047",

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journal = "Applied Physics Letters",

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T1 - Anomalous blueshift in emission spectra of ZnO nanorods with sizes beyond quantum confinement regime

AU - Chen, Chun Wei

AU - Chen, Kuei Hsien

AU - Shen, Ching Hsing

AU - Ganguly, Abhijit

AU - Chen, Li Chyong

AU - Wu, Jih Jen

AU - Wen, Hui I.

AU - Pong, Way Faung

N1 - Funding Information: The authors would like to acknowledge Academia Sinica, the Ministry of Education, and National Science Council, Taiwan for financial support of this research.

PY - 2006/6/12

Y1 - 2006/6/12

N2 - 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.

AB - 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.

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

Abstract

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