01.12.2015 , (Web Science, Scopus) (. Vak.ed.gov.ru/87)



© 2018    I. M. Mehedi*, Ph. D in Engineering; Md. S. Hasan**, M. Sc. in Engineering; Md. R. Islam**, Ph. D in Engineering; A. M. Dobaie*, Ph. D in Engineering

*   Department of Electrical and Computer Engineering, King Abdulaziz University, Jeddah-21589, Saudi Arabia

** Department of Electrical and Electronic Engineering, Khulna University of Engineering & Technology, Khulna-9203, Bangladesh

E-mail: imehedi@kau.edu.sa, rafiq043@yahoo.com

Submitted 08.10.2017

The temperature dependent anomalous optical properties of AlInGaN quaternary alloy have been studied using Monty-Carlo simulation of phonon-assisted exciton hopping. The simulation results are well agreed with the experimental photoluminescence line widths and the peak energy positions while considering the additional inhomogeneous broadening with band potential fluctuation and the phonon induced radiative lifetime of exciton. The incorporation of bandgap shrinkage to the conventional Monte-Carlo simulation shows a good fit for the photoluminescence peak energy positions in AlInGaN quaternary alloy with the temperature induced experimental unusual behavior (redshift-blueshift-redshift). The W-shaped temperature dependent inhomogeneities are observed for the PL line widths. The temperature induced S-shaped photoluminescence band peaks and W-shaped line width have been attributed to the change of exciton dynamics due to the Indium aggregated potentials and the exciton localization effects. These results could be important to understand the realistic optical properties of AlInGaN quaternary alloy based electronic and optoelectronic devices.

Keywords: AlInGaN, exciton, Monte-Carlo simulation, photoluminescence, temperature.

OCIS codes: 160.0160, 160.4670, 160.4760, 250.0250, 250.5230



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