Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect
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...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2011
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| Online Access: | https://hdl.handle.net/10356/93618 http://hdl.handle.net/10220/7415 |
| _version_ | 1811691551446794240 |
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| author | Shi, S. L. Li, G. Q. Xu, S. J. Zhao, Yang Chen, Guan Hua |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Shi, S. L. Li, G. Q. Xu, S. J. Zhao, Yang Chen, Guan Hua |
| author_sort | Shi, S. L. |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T06:21:41Z |
| format | Journal Article |
| id | ntu-10356/93618 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:21:41Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/936182020-06-01T10:13:39Z Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect Shi, S. L. Li, G. Q. Xu, S. J. Zhao, Yang Chen, Guan Hua School of Materials Science & Engineering DRNTU::Engineering::Materials::Photonics and optoelectronics materials 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. 2011-12-16T04:36:15Z 2019-12-06T18:42:26Z 2011-12-16T04:36:15Z 2019-12-06T18:42:26Z 2006 2006 Journal Article 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. https://hdl.handle.net/10356/93618 http://hdl.handle.net/10220/7415 10.1021/jp0610968 en Journal of physical chemistry B © 2006 American Chemical Society |
| spellingShingle | DRNTU::Engineering::Materials::Photonics and optoelectronics materials Shi, S. L. Li, G. Q. Xu, S. J. Zhao, Yang Chen, Guan Hua Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect |
| title | Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect |
| title_full | Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect |
| title_fullStr | Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect |
| title_full_unstemmed | Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect |
| title_short | Green luminescence band in ZnO : fine structures, electron−phonon coupling and temperature effect |
| title_sort | green luminescence band in zno fine structures electron phonon coupling and temperature effect |
| topic | DRNTU::Engineering::Materials::Photonics and optoelectronics materials |
| url | https://hdl.handle.net/10356/93618 http://hdl.handle.net/10220/7415 |
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