Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5399204 | Journal of Luminescence | 2016 | 39 Pages |
Abstract
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 γ-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 γ-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.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
B. Hari Babu, V.V. Ravi Kanth Kumar,