Journal
JOURNAL OF LUMINESCENCE
Volume 169, Issue -, Pages 16-23Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2015.08.058
Keywords
Glasses; Photoluminescence properties; FTIR: warm white light; gamma-irradiation effects
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This paper mainly emphasizes on the warm white light generation through an energy transfer from Dy3+ to Eu3+ ; Eu2+ to Dy3+, Eu3+ ions doped in sodium aluminoborate glasses. Absorption and FTIR studies confer that gamma-irradiation causes the compaction of the borate network by breaking the bonds between trigonal elements leading to a decrease in the optical band gap. Electron paramagnetic resonance (EPR) confirms the defects induced in glasses by 7-irradiation. The presence of radiation induced defects and the effective energy transfer between the ions make the decay curves change from single exponential (before irradiation) into non-exponential nature (after irradiation). The non-exponential curves are good-fitted to modified Yokota-Tanimoto model for S= 8 indicating that the nature of energy transfer process is of dipole-quadrupole type. The color coordinates are found to fall in the white light zone of the CIE diagram. (C) 2015 Elsevier B.V. All rights reserved.
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