Singh, Vijay and Chakradhar, R P S and Rao, J L and Kwak, Ho-Young (2009) Characterization, EPR and photoluminescence studies of LiAl(5)O(8):Cr phosphors. Solid State Sciences, 11 (4). pp. 870-874. ISSN 1293-2558

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Abstract

Red emitting Cr(3+) doped LiAl(5)O(8) powder phosphor was prepared by combustion route using corresponding metal nitrates and urea in a single step. The prepared powder was characterized by X-ray diffraction and surface area measurements were carried out by Brunauer-Emmet-Teller adsorption isotherms. The electron paramagnetic resonance spectrum in the low field regions is typical for isolated Cr(3+) ions whereas the resonance signal in the high field region with g = 1.95 is due to exchange coupled Cr(3+)-Cr(3+) pairs. The optical studies show two broad and intense bands characteristic of Cr(3+) ions in distorted octahedral symmetry. The photoluminescence spectrum gives a narrow red emission at 710 nm corresponding to (2E)(g) -> (4A)(2g) transition upon excitation of 562 mm. The crystal field parameter (Dq), Racah inter-electronic repulsion parameters (B and C) and nephelauxetic parameters have been evaluated and discussed. (C) 2009 Elsevier Masson SAS. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Combustion; Cr(3+) ions; Phosphor; Photoluminescence; Electron paramagnetic resonance
Subjects:	Electronics
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	02 Mar 2012 05:35
Last Modified:	02 Mar 2012 05:35
URI:	http://cgcri.csircentral.net/id/eprint/1111

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