Singh, Vijay and Chakradhar, R P S and Rao, J L and Kwak, Ho-Young (2011) Enhanced blue emission and EPR study of LaMgAl(11)O(19) Eu phosphors. Journal of Luminescence, 131 (2). pp. 247-252. ISSN 0022-2313

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Abstract

Europium doped LaMgAl(11)O(19) phosphor was prepared by the combustion met hod The as-prepared and post-treated (1350 degrees C 10 h 5% H(2)+95% N(2)) phosphors wen investigated by X-ray diffraction (XRD) Fourier transform infrared (FT-IR) scanning electron microscopy (SEM) photoluminescence (PL) and electron paramagnetic resonance (EPR) techniques XRD patterns show that LaMgAl(11)O(19) Eu phosphors have hexagonal structure FT-IR spectrum exhibits absorption bands corresponding to the stretching vibration of AlO(4) and AlO(6) Morphological studies reveal that this phosphor has faceted plates of varying sizes and shapes The as-prepared LaMgAl(11)O(19) Eu phosphor consists of both Eu(3+) and Eu(2+) ions The phosphor exhibits a bright blue emission at 450 nm (4f(6)5d -> 4f(7) transition of Eu(2+)) On post-treating the phosphor we are able to enhance the blue emission efficiency by 330% The process was detected from the evolution of excitation emission and EPR spectra and the results are discussed (C) 2010 Elsevier B V All rights reserved

Item Type:	Article
Uncontrolled Keywords:	XRD; SEM; FT IR; EPR; Photoluminescence; Eu(2+) ions
Subjects:	Physical Properties
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	20 Jan 2012 04:45
Last Modified:	01 Nov 2013 11:33
URI:	http://cgcri.csircentral.net/id/eprint/410

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