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Title: Trap spectroscopy and thermoluminescence of persistent luminescent materials
Authors: Singh, Th Basanta
Mashangva, Magdalene
Gartia, R K
Keywords: Persistent luminescence;Trapping parameters;Thermoluminescence
Issue Date: Apr-2013
Publisher: NISCAIR-CSIR, India
Abstract: A comprehensive picture of the trap-spectroscopy of CaAl2O4:Eu2+, Re3+ system, a well known persistent luminescent material is presented to remove some misconceptions that has crept into the literature of thermoluminescence (TL) and its applications. In order to achieve this, we have deconvoluted some TL curves recorded in the temperature range 20-325 K presented by Aitasalo et al., J Alloy Comp, 4-8 (2004) 380, using the general order kinetics equation for TL. This enables us to evaluate the three key intrinsic trapping parameters (activation energy, E, frequency factor, s and order of kinetics, b) of TL peaks relevant to persistent luminescence and thus evaluate the lifetime (τ) of charge (electron/hole) in these traps. As many as ten trapping levels could be identified in CaAl2O4:Eu2+, Re3+ system. The technique of TL is a unique powerful technique to characterize persistent luminescent materials of all kinds. Finally, some simple guidelines are provided for use of TL in determining the trap-spectroscopy of insulating/semiconducting materials so as to use it in designing materials for specific use.
Page(s): 223-229
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.51(04) [April 2013]

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