Singh, Vijay and Chakradhar, R P S and Ledoux-Rak, Isabelle and Badie, Laurent and Pelle, Fabienne and Ivanova, Svetlana (2009) Infrared and visible emission of Er(3+) in combustion-synthesized CaAl(2)O(4) phosphors. Journal of Luminescence, 129 (11). pp. 1375-1380. ISSN 0022-2313

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Abstract

New near-infrared luminescent, monoclinic CaAl(2)O(4):Er(3+) phosphor was prepared by using the combustion route at furnace temperatures as low as 500 degrees C in a few minutes. Combustion synthesized phosphor has been well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive analysis of X-ray (EDAX) mapping studies. The luminescence spectra of Er(3+)-doped calcium aluminate were studied at UV (380 nm), vis (488 nm) and IR (980 nm) excitation. Upon UV and vis excitation, the CaAl(2)O(4):Er(3+) phosphor exhibits emission bands at similar to 523 nm and at similar to 547 nm, corresponding to transitions from the (2)H(11/2) and (4)S(3/2) erbium levels to the (4)I(15/2) ground state. A strong luminescence at 1.55 mu m in the infrared (IR) region due to (4)I1(3/2)->(4)I(15/2) transition has been observed in CaAl(2)O(4):Er(3+) phosphor upon 980 nm CW pumping. In the spectrum of IR-excited up-conversion luminescence, green (similar to 523 and similar to 547 nm) and red (662 nm) luminescence bands were present, the latter associated with the (4)F(9/2)->(4)I(15/2) transitions of Er(3+) ions. Both excited state absorption and energy transfer may be proposed as processes responsible for the population of the (4)S(3/2) and (4)F(9/2) erbium levels upon IR excitation. The mechanisms responsible for the up-conversion luminescence are discussed. (c) 2009 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Combustion; Visible and near-infrared luminescence; Up-conversion; Er(3+) ions
Subjects:	Engineering Materials
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	02 Mar 2012 05:36
Last Modified:	02 Mar 2012 05:36
URI:	http://cgcri.csircentral.net/id/eprint/1113

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