Compositional dependence of spontaneous emission probabilities between initial 4F,, and terminal ' Z, (J = 9/2, 1112, 13/2,15/2) levels of Nd3+ were studied for about 90 samples of silicate, borate, and phosphate glasses using the Judd-Ofelt theory. The effect of the covalency of the Nd-0 bond on the magnitude of intensity parameters was estimated from the variation of spectral profiles of the ' Z9/, 4 4G, , 'G,,, and 4F,12, 4S,,2 transitions. Intensity parameters R4 and R, and the spontaneous emission probabilities were strongly affected by the ionic packing ratio of the glass host. The results were discussed in terms of the site selectivity of Nd3+ ions in glasses.
Judd‐Ofelt parameters Ωt with t= 2,4, 6 for the rare‐earth ions Pr3+, Nd3+, Sm3+, Tb3+, Dy3+, Ho3+, Er3+, and Tm3+ in alkali and/or alkaline‐earth silicate, borate, and phosphate glasses have been determined. The variations of Ωt with the number of 4f electrons of the rare‐earth ions are demonstrated, and factors affecting the Judd‐Ofelt parameter Ω6are discussed. The intensity parameter Ω6 depends on the ionic packing ratio of the glass host by changing modifier type in silicate and borate glasses, and it is independent of that in a series of borate glasses as a function of modifier content and phosphate glasses. The peak wavenumbers of the transitions whose intensities are determined mainly by the Ω6<|U(6)|>2 term—where <|U(6)|> is one of the reduced matrix elements—shift systematically with the values of Ω6 for all the rare‐earth ions.
Compositional dependence of spontaneous emission probabilities of Er3+ was studied for silicate, borate, and phosphate glasses using the Judd-Ofelt theory. Through all of the glass systems, spontaneous emission probabilities of the 4Z, , , , + 4Z1512, 'Z9/, +-'IIJ, and 4S,,, + 'IJ (J = 9/2,11/2,1312, 1512) transitions increased with increased ionic packing ratio of the glass host, which varied markedly with the type of network modifier. The effect of Er-0 covalency on the transition probabilities was discussed from the spectral profile of the 4Z,,, +-' s , transition in terms of nephelauxetic effect.
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