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Green luminescence band in ZnO :  fine structures, electron−phonon coupling and temperature effect

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Green luminescence band in ZnO :  fine structures, electron−phonon coupling and temperature effect

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dc.contributor.author Shi, S. L.
dc.contributor.author Li, G. Q.
dc.contributor.author Xu, S. J.
dc.contributor.author Zhao, Yang
dc.contributor.author Chen, Guan Hua
dc.date.accessioned 2011-12-16T04:36:15Z
dc.date.available 2011-12-16T04:36:15Z
dc.date.copyright 2006
dc.date.issued 2011-12-16
dc.identifier.citation Shi, S. L., Li, G. Q., Xu, S. J., Zhao, Y., & Chen, G. H. (2006). Green Luminescence Band in ZnO:  Fine Structures, Electron−Phonon Coupling, and Temperature Effect. Journal of Physical Chemistry B, 110 (21), 10475–10478.
dc.identifier.uri http://hdl.handle.net/10220/7415
dc.description.abstract The green emission band of ZnO has been investigated by both experimental and theoretical means. Two sets of equally separated fine structures with the same periodicity (close to the longitudinal optical (LO) phonon energy of ZnO) are well resolved in the low-temperature broad green emission spectra. As the temperature increases, the fine structures gradually fade out and the whole green emission band becomes smooth at room temperature. An attempt to quantitatively reproduce the variable-temperature green emission spectra using the underdamped multimode Brownian oscillator model taking into account the quantum dissipation effect of the phonon bath is done. Results show that the two electronic transitions strongly coupled to lattice vibrations of ZnO lead to the observed broad emission band with fine structures. Excellent agreement between theory and experiment for the entire temperature range enables us to determine the dimensionless Huang−Rhys factor characterizing the strength of electron−LO phonon coupling and the coupling coefficient of the LO and bath modes.
dc.language.iso en
dc.relation.ispartofseries Journal of physical chemistry B
dc.rights © 2006 American Chemical Society
dc.subject DRNTU::Engineering::Materials::Photonics and optoelectronics materials.
dc.title Green luminescence band in ZnO :  fine structures, electron−phonon coupling and temperature effect
dc.type Journal Article
dc.contributor.school School of Materials Science and Engineering
dc.identifier.doi http://dx.doi.org/10.1021/jp0610968

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