Combustion synthesis approach for spectral tuning of Eu doped CaAl2O4 phosphors
Data(s) |
2014
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Resumo |
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. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/48457/1/jou_all_com_589_596_2014.pdf 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. |
Publicador |
ELSEVIER SCIENCE SA |
Relação |
http://dx.doi.org/10.1016/j.jallcom.2013.11.221 http://eprints.iisc.ernet.in/48457/ |
Palavras-Chave | #Materials Research Centre #Solid State & Structural Chemistry Unit |
Tipo |
Journal Article PeerReviewed |