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
2006 Applied Physics Letters  
Cathodoluminescence ͑CL͒ 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
more » ... ows 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.
doi:10.1063/1.2211047 fatcat:whmngonuvrco5ojtkhwvm6ymf4