Photoluminescence characterization of zinc(1-x) manganese(x) sulfur under different excitation sourc...

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" Photoluminescence characterization of zinc(1-x) manganese(x) sulfur under different excitation sources "
Y. Ye F. D. Medina

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1113506
Doc. No	:	TLpq230794640
Main Entry	:	F. D. Medina
	:	Y. Ye
Title & Author	:	Photoluminescence characterization of zinc(1-x) manganese(x) sulfur under different excitation sources\ Y. YeF. D. Medina
College	:	Florida Atlantic University
Date	:	1993
student score	:	1993
Degree	:	M.S.
Page No	:	128
Abstract	:	A study of the temperature dependence of the photoluminescence spectra from Zn1-xMnxS (x = 0.01, 0.03, 0.05, 0.10, 0.20, 0.25, 0.30, 0.35 and 0.50) with different excitation energies (514.5, 488.0, 457.9, 405.5 and 365.9 nm) is given. A new band is reported in addition to the four usual emission bands. The unusual shift of the 2.1 eV (YEL) band energy is first observed in our experiments. Models for YEL, ORG (2.0 eV) and RED (1.7 eV) emission bands have been proposed. The quenching with concentration and temperature and the influence of excitation energy on the photoluminescence are discussed. The spin-spin exchange interaction between the nearest neighbor Mn ions (d-d electrons), and the exchange interaction between 3d electrons of Mn ions and the conduction or valence band electrons (d-s or d-p electrons) are introduced to interpret the shift of the bands. The strong electron-phonon interaction is also analyzed, and an effective phonon energy and a Huang-Rhys factor are obtained.
Subject	:	Applied sciences
	:	Condensation
	:	Materials science
	:	Optics
	:	Optics
	:	Pure sciences