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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/6458

Title: Correlated ESR, PL and TL studies on K3Na(SO4)(2): Eu thermoluminescence dosimetry phosphor
Authors: DHOBLE, SJ
MOHARIL, SV
RAO, TKG
Keywords: electron-spin-resonance
single-crystals
caso4-dy
luminescence
mechanisms
baso4-eu
Issue Date: 2001
Publisher: ELSEVIER SCIENCE BV
Citation: JOURNAL OF LUMINESCENCE, 93(1), 43-49
Abstract: Strong thermoluminescence (TL) was observed in K3Na(SO4)(2):Eu phosphor in the Eu doped K2SO4-Na2SO4 system. The defect centres formed in this TL phosphor are studied using the technique of electron spin resonance. Two glow peaks at 423 and 475 K are observed in K3Na(SO4)(2):Eu phosphor prepared by the melt method. The peak 475 K is shown to be at least thrice as sensitive as the conventional CaSO4: Dy phosphor used in the TL dosimetry of ionizing radiations. Two centres, assigned to SO4- and SO3-, are observed at room temperature in the melt prepared phosphor. Step annealing measurements showed a connection between these centres and the observed TL glow peaks. Three TL glow peaks at 360, 423 and 453 K are observed in the K3Na(SO4)(2):Eu phosphor prepared by the evaporation method. A SOS centre and two different SO4- centres are observed in this phosphor. TL and photoluminescence emission spectra indicate that the europium ion is in the divalent state in K3Na(SO4)(2):Eu phosphor. (C) 2001 .
URI: http://dx.doi.org/10.1016/S0022-2313(01)00176-4
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6458
http://hdl.handle.net/10054/6458
ISSN: 0022-2313
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