Photoluminescence analysis of zinc(1-x) manganese(x) selenium

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" Photoluminescence analysis of zinc(1-x) manganese(x) selenium "
J. Xue F. D. Medina

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1113503
Doc. No	:	TLpq304374890
Main Entry	:	F. D. Medina
	:	J. Xue
Title & Author	:	Photoluminescence analysis of zinc(1-x) manganese(x) selenium\ J. XueF. D. Medina
College	:	Florida Atlantic University
Date	:	1997
student score	:	1997
Degree	:	M.S.
Page No	:	115
Abstract	:	usd\rm Zn\sb{1-x}Mn\sb{x}Seusd is a ternary alloy belonging to a class of materials known as Diluted Magnetic Semiconductors (DMS's). Single-crystal samples of this material possesses a cubic (zinc-blende) structure for usdx<0.30usd and a hexagonal (wurtzite) structure for usd0.30<x<0.57.usd Photoluminescence spectra are taken on the samples with usdx=0.00080,usd 0.0029, 0.0093, 0.017, 0.029 and 0.038 in the temperature range between 26 usd\tousd 300 K. Three emission bands are detected and are named the YEL (centered 2.12 eV), ORA (centered 1.91 usd\tousd 1.98 eV) and IR bands. The shift of the YEL band is observed and related to the d-d interaction of the Mn ions and to thermal lattice expansion. The electron-phonon interaction is used to explain the broadening of the YEL band. A model is proposed to explain the existence of the ORA band and the shift of its energy with temperature and Mn concentration. This model for the first time provides a detailed explanation of the anomalous behavior of the energy gap of this material for low Mn concentrations.
Subject	:	Condensation
	:	Optics
	:	Pure sciences