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Title: Ce3+ ? Eu2+ energy transfer studies on BaMgSiO4
Authors: Sivakumar, V.
Varadaraju, U.V.
Keywords: Cerium compounds
Energy transfer
Light emission
Phase composition
Positive ions
Blue emissions
Emission intensity
Green phosphors
Solid-state lighting
Barium alloys
Issue Date: 2007
Citation: Journal of the Electrochemical Society, 154(5), J167-J171
Abstract: Ce3+ luminescence is studied for the first time in BaMgSiO4. Intense and broad blue emission is observed with maximum at 430 nm when excited with 356 nm. Studies on Ba1-2y Cey Liy MgSiO4 (y=0.0025-0.125) show that the emission intensity is maximum for y=0.1 and a decrease in emission intensity is observed for higher y values. The concentration of Eu2+ and Ce3+ are varied in BaMgSiO4: 0.1 Ce3+, Eu2+, and BaMgSiO4: 0.01 Eu2+, Ce3+ systems, respectively, in order to find the critical concentration of Eu2+ and Ce3+ to achieve high emission intensity of Eu2+. Ba0.75 Eu0.05 Ce0.1 Li0.1 MgSiO4 and Ba0.97 Eu0.01 Ce0.01 Li0.01 MgSiO4 compositions show maximum Eu2+ emission, and the emission intensity is found to be comparable with that of commercial ZnS:Cu,Al (green phosphor, SONY) under near-UV excitation (400 nm). Commission Internationale de I'Eclairage (CIE) chromaticity coordinates indicate that the Eu2+ and Ce3+ substituted compositions are potential green phosphors for solid-state lighting, light-emitting diode technology. � 2007 The Electrochemical Society.
ISSN: 134651
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