Excited state relaxation dynamics and non-radiative energy transfer in fluoroindate glass singly doped with thulium and doubly doped with thulium andterbium
W. Ryba-romanowski et al., Excited state relaxation dynamics and non-radiative energy transfer in fluoroindate glass singly doped with thulium and doubly doped with thulium andterbium, J ALLOY COM, 325(1-2), 2001, pp. 215-222
Effect of activator concentration on luminescence spectra and luminescence
decay of excited states of Tm3+ in indium-based fluoride glass has been inv
estigated. 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-Hirayam
a 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 th
at the glass matrix favours the ion-ion interaction. Relaxation dynamics fo
r glass samples doubly doped with thulium and terbium provides evidence tha
t 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.