mirage

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

DSpace/Manakin Repository

 

Search DR-NTU


Advanced Search Subject Search

Browse

My Account

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

Show full item record

Title: Green luminescence band in ZnO :  fine structures, electron−phonon coupling and temperature effect
Author: Shi, S. L.; Li, G. Q.; Xu, S. J.; Zhao, Yang; Chen, Guan Hua
Copyright year: 2006
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.
Subject: DRNTU::Engineering::Materials::Photonics and optoelectronics materials.
Type: Journal Article
Series/ Journal Title: Journal of physical chemistry B
School: School of Materials Science and Engineering
Rights: © 2006 American Chemical Society

Files in this item

Files Size Format View

There are no files associated with this item.

   

DOI Query

- Get published version (via Digital Object Identifier)
   

This item appears in the following Collection(s)

Show full item record