H. Takebe et al., EFFECT OF NETWORK MODIFIER ON SPONTANEOUS EMISSION PROBABILITIES OF ER3+ IN OXIDE GLASSES, Journal of the American Ceramic Society, 77(8), 1994, pp. 2132-2136
Compositional dependence of spontaneous emission probabilities of Er3 was studied for silicate, borate, and phosphate glasses using the Jud
d-Ofelt theory. Through all of the glass systems, spontaneous emission
probabilities of the I-4(3/2) --> I-4(15/2), I-4(9/2) --> I-4(J), and
S-4(3/2) --> I-4(J) (J = 9/2, 11/2, 13/2, 15/2) transitions increased
with increased ionic packing ratio of the glass host, which varied ma
rkedly with the type of network modifier. The effect of Er-O covalency
on the transition probabilities was discussed from the spectral profi
le of the I-4(15/2) --> S-4(3/2) transition in terms of nephelauxetic
effect.