Combustion synthesis approach for spectral tuning of Eu doped CaAl2O4 phosphors

Krishna, Hari R and Nagabhushana, BM and Nagabhushana, H and Chakradhar, RPS and Murthy, Suriya N and Sivaramakrishna, R and Shivakumara, C and Rao, JL and Thomas, Tiju (2014) Combustion synthesis approach for spectral tuning of Eu doped CaAl2O4 phosphors. In: JOURNAL OF ALLOYS AND COMPOUNDS, 589 . pp. 596-603.

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Abstract

Despite being a particularly good emitter, use of divalent Eu has been seriously limited. This is because severe reducing environments or special hosts are needed during synthesis of divalent Eu containing phosphors. In this work we stabilize Eu in its 2+ state (in CaAl2O4) using an open-air solution combustion reaction. The impact of fuel (F) to oxidizer (O) molar ratios (F/O = 0.5-2.0) on luminescence properties is explored. Chromaticity of Eu:CaAl2O4 depends sensitively on the F/O ratio. In general, higher F/O inhibits Eu3+ and promotes Eu2+ formation, which in turn improves the quality of the blue phosphor. EPR spectra show inhomogeneous broadening effects with the increase in F/O ratio, which suggests that disorder creation is promoted when F/O is increase. This is also confirmed by an increase in emission line width in PL spectra, when F/O is increased. (C) 2013 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF ALLOYS AND COMPOUNDS
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copyright for this article belongs to the ELSEVIER SCIENCE SA, SWITZERLAND
Keywords:	Nanophosphor; Solution combustion; Photoluminescence; CIE; Electron paramagnetic resonance
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	25 Feb 2014 08:31
Last Modified:	25 Feb 2014 08:31
URI:	http://eprints.iisc.ac.in/id/eprint/48457

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