Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/1296
Title: Effect of Zr4+ and Si4+ substitution on the luminescence properties of CaMoO4:Eu3+ red phosphors
Authors: Linda Francis, T
Prabhakar Rao, P
Mariyam Thomas
Mahesh, S K
Reshmi, V R
Keywords: Red phosphors
Photoluminescence properties
Issue Date: 2014
Publisher: Springer
Citation: Journal of Materials Science: Materials in Electronics 25(5):2387-2393;May 2014
Abstract: A series of intense red emitting phosphors, Ca0.8-xZrxMo1-xSixO4:0.2Eu3+ (x = 0.025, 0.05, 0.075,0.1) that could be effectively excited in the UV region was prepared by conventional high temperature solid state reaction route. Structural, morphological and photoluminescence properties of the prepared samples were studied in detail. The incorporation of Zr4+ and Si4+ ions in CaMoO4 lattice maintained the powellite crystal structure. Luminescence properties were optimized for 7.5 mol% of Zr4+ and Si4+ concentration. Emission intensities improved more than twice in comparison with CaMoO4:Eu3+. Life times of the prepared samples improved and the quantum efficiency enhanced to ~39 %. The improvement in emission intensity and quantum efficiency is explained in terms of the local distortion around the Eu3+ ions resulting in improved absorption in the UV region. The CIE color co-ordinates of the red emission were in agreement with the values of the standard red phosphors providing potentiality to be used in phosphor converted (pc) white LEDs.
URI: http://ir.niist.res.in:8080/jspui/handle/123456789/1296
ISSN: 0957-4522
Appears in Collections:2014

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