Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 325, Issue 1-2, Pages 215-222Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-8388(01)01265-8
Keywords
optical materials; optical luminescence
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Effect of activator concentration on luminescence spectra and luminescence decay of excited states of Tm3+ in indium-based fluoride glass has been investigated. Self-quenching of luminescence originating in the D-1(2), (1)G(4) and the H-3(4), levels is found to be significant at doping levels as low as 0.5%. Luminescence decay curves are consistent with the Inokuti-Hirayama model for the non-radiative energy transfer involving an electric dipole-electric dipole interaction. Critical distance R-0 = 12.3 Angstrom, derived from an analysis of the (1)G(4) decay, is relatively high and indicates that the glass matrix favours the ion-ion interaction. Relaxation dynamics for glass samples doubly doped with thulium and terbium provides evidence that terbium ions are able to shorten the F-3(4) lifetime with extremely high efficiency. However, the Tm3+--> Tb3+ energy transfer contributes adversely to relaxation of the H-3(4) level. Critical distance for this interaction is nearly the same as that for the self-quenching of Tm3+ luminescence. (C) 2001 Elsevier Science B.V. All rights reserved.
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