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Title: Studies of defects in combustion synthesized europium-doped LiAl{sub 5}O{sub 8} red phosphor

Abstract

Europium-doped LiAl{sub 5}O{sub 8} red phosphor was prepared using a self-propagating (combustion) synthesis. The formation of crystalline LiAl{sub 5}O{sub 8} was confirmed by X-ray diffraction. The morphological aspect of the resulting powders was examined by scanning electron microscopy. Electron spin resonance studies have been carried out in order to study the characteristics of the defect centres and the thermoluminescence (TL) peaks observed in this phosphor. Two types of centres (centre I and centre II) have been identified in LiAl{sub 5}O{sub 8}:Eu. Centre I is characteristic of a species exhibiting an isotropic g-value 2.0089 with a line width of 70 G and is assigned to a V-centre. Centre II is also characterized by an isotropic g-value 2.0059 with a line width of about 10 G. Centre II is ascribed to a F{sup +}-centre. A room temperature photoluminescence study shows a strong emission line at 613 nm corresponding to the {sup 5}D{sub 0}{yields}{sup 7}F{sub 2} transition of Eu{sup 3+} ions. - Graphical abstract: LiAl{sub 5}O{sub 8}:Eu{sup 3+} phosphors have been synthesized in a very short time (lt;5 min) by combustion process and are well characterized by XRD and SEM. TL glow peak was observed in gamma-irradiated Eu ion-doped LiAl{sub 5}O{sub 8} atmore » around 180 deg. C. Electron spin resonance studies have been carried out in order to study the characteristics of the defect centres. Photoluminescence studies showed red emission located at about 613 nm and is ascribed to {sup 5}D{sub 0}-{sup 7}F{sub 2} transition of Eu{sup 3+} ions.« less

Authors:
 [1];  [2]
  1. Laboratoire de Photonique Quantique et Moleculaire, UMR CNRS 8537, Institut d'Alembert-Ecole Normale Superieure de Cachan, 61 avenue du President Wilson, 94235 Cachan (France), E-mail: vijayjiin2006@yahoo.com
  2. R.S.I.C., Indian Institute of Technology, Powai, Mumbai 400 076 (India)
Publication Date:
OSTI Identifier:
21128323
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 181; Journal Issue: 6; Other Information: DOI: 10.1016/j.jssc.2008.03.007; PII: S0022-4596(08)00138-2; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM COMPOUNDS; COMBUSTION; DOPED MATERIALS; ELECTRON SPIN RESONANCE; EUROPIUM COMPOUNDS; EUROPIUM IONS; G VALUE; IRRADIATION; LITHIUM COMPOUNDS; OXIDES; PHOSPHORS; PHOTOLUMINESCENCE; POWDERS; SCANNING ELECTRON MICROSCOPY; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; THERMOLUMINESCENCE; V CENTERS; X-RAY DIFFRACTION

Citation Formats

Singh, Vijay, and Gundu Rao, T.K. Studies of defects in combustion synthesized europium-doped LiAl{sub 5}O{sub 8} red phosphor. United States: N. p., 2008. Web. doi:10.1016/j.jssc.2008.03.007.
Singh, Vijay, & Gundu Rao, T.K. Studies of defects in combustion synthesized europium-doped LiAl{sub 5}O{sub 8} red phosphor. United States. doi:10.1016/j.jssc.2008.03.007.
Singh, Vijay, and Gundu Rao, T.K. Sun . "Studies of defects in combustion synthesized europium-doped LiAl{sub 5}O{sub 8} red phosphor". United States. doi:10.1016/j.jssc.2008.03.007.
@article{osti_21128323,
title = {Studies of defects in combustion synthesized europium-doped LiAl{sub 5}O{sub 8} red phosphor},
author = {Singh, Vijay and Gundu Rao, T.K.},
abstractNote = {Europium-doped LiAl{sub 5}O{sub 8} red phosphor was prepared using a self-propagating (combustion) synthesis. The formation of crystalline LiAl{sub 5}O{sub 8} was confirmed by X-ray diffraction. The morphological aspect of the resulting powders was examined by scanning electron microscopy. Electron spin resonance studies have been carried out in order to study the characteristics of the defect centres and the thermoluminescence (TL) peaks observed in this phosphor. Two types of centres (centre I and centre II) have been identified in LiAl{sub 5}O{sub 8}:Eu. Centre I is characteristic of a species exhibiting an isotropic g-value 2.0089 with a line width of 70 G and is assigned to a V-centre. Centre II is also characterized by an isotropic g-value 2.0059 with a line width of about 10 G. Centre II is ascribed to a F{sup +}-centre. A room temperature photoluminescence study shows a strong emission line at 613 nm corresponding to the {sup 5}D{sub 0}{yields}{sup 7}F{sub 2} transition of Eu{sup 3+} ions. - Graphical abstract: LiAl{sub 5}O{sub 8}:Eu{sup 3+} phosphors have been synthesized in a very short time (lt;5 min) by combustion process and are well characterized by XRD and SEM. TL glow peak was observed in gamma-irradiated Eu ion-doped LiAl{sub 5}O{sub 8} at around 180 deg. C. Electron spin resonance studies have been carried out in order to study the characteristics of the defect centres. Photoluminescence studies showed red emission located at about 613 nm and is ascribed to {sup 5}D{sub 0}-{sup 7}F{sub 2} transition of Eu{sup 3+} ions.},
doi = {10.1016/j.jssc.2008.03.007},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 6,
volume = 181,
place = {United States},
year = {2008},
month = {6}
}