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Spectroscopic and luminescence studies of thulium doped strontium borate glass

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Title Spectroscopic and luminescence studies of thulium doped strontium borate glass
 
Creator SESHAGIRI, TK
PORWAL, NK
SUDERSAN, V
RAO, TKG
TYAGI, AK
GODBOLE, SV
 
Subject thermally stimulated luminescence
optical-properties
divalent thulium
energy levels
tetraborate
europium
ions
absorption
crystals
spectra
absorption
luminescence
time resolved measurements
borates
radiation
rare-earths in glasses
electron spin resonance
nmr, mas-nmr and nqr
 
Description Un-doped as well as Tm doped strontium borate glasses were prepared and characterized by different spectroscopic techniques. (11)B MAS-NMR studies on the glass samples have shown the presence of BO(3) structural units in addition to the tetrahedrally coordinated BO(4) structural units confirming glass formation. Optical absorption and photoluminescence studies of these samples showed stabilization of thulium as Tm(3+) ions in the virgin sample, while, on gamma-irradiation, partial reduction to Tm(2+) was observed. EPR investigations of virgin and gamma-irradiated samples showed the presence of BO(3)(2-) centered radicals in the latter samples only. TSL studies of gamma-irradiated Tm doped strontium borate glass showed two glow peaks around 423 and 528 K. Tm(3+) was identified as the luminescent center from spectral studies. Temperature dependence studies of EPR spectra have shown the thermal destruction of BC(3)(2-) radical ion to be associated with the TSL glow peak at 423 K. Based on these investigations, the mechanism for the processes occurring during gamma-irradiation and subsequent thermal treatment is proposed. .
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-26T18:34:03Z
2011-12-26T12:55:34Z
2011-12-27T05:41:13Z
2011-07-26T18:34:03Z
2011-12-26T12:55:34Z
2011-12-27T05:41:13Z
2010
 
Type Article
 
Identifier JOURNAL OF NON-CRYSTALLINE SOLIDS, 356(20-22), 1032-1036
0022-3093
http://dx.doi.org/10.1016/j.jnoncrysol.2010.01.019
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6991
http://hdl.handle.net/10054/6991
 
Language en