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Synthesis, photoluminescence, thermoluminescence and electron spin resonance investigations of CaAl12O19 : Eu phosphor

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Title Synthesis, photoluminescence, thermoluminescence and electron spin resonance investigations of CaAl12O19 : Eu phosphor
 
Creator SINGH, V
RAO, TKG
ZHU, JJ
 
Subject persistent luminescence materials
strontium aluminate
temperature
displays
lamps
eu2+
epr
phosphors
doping
luminescence
defect centres
 
Description The present paper describes the synthesis of europium-doped calcium aluminate phosphor using the combustion method. An efficient blue emission phosphor can be prepared at reaction temperatures as low as 500 degrees C in a few minutes by this method. Characterization of the powder was done by X-ray diffraction, transmission electron microscopy, scanning electron microscope analysis and the optical properties were studied by photoluminescence spectra. Thermoluminescence (TL) studies also have been carried out on CaAl12O19:Eu2+ phosphor. The TL glow curve shows peaks at 174 and 240 degrees C. Defect centres formed in irradiated phosphor have been studied using the technique of electron spin resonance. Step annealing measurements, indicate that one of the annealing stages of a defect centre appear to correlate with the release of carriers resulting in TL peak at 174 degrees C. The centre is characterized by an isotropic g-value of 2.0046 and is assigned to a F+ centre. (C) 2006
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-26T23:30:51Z
2011-12-26T12:52:39Z
2011-12-27T05:39:13Z
2011-07-26T23:30:51Z
2011-12-26T12:52:39Z
2011-12-27T05:39:13Z
2007
 
Type Article
 
Identifier JOURNAL OF LUMINESCENCE, 126(1), 1-6
0022-2313
http://dx.doi.org/10.1016/j.jlumin.2006.04.003
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7048
http://hdl.handle.net/10054/7048
 
Language en