Compositional Dependence of Judd‐Ofelt Parameters in Silicate, Borate, and Phosphate Glasses

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Abstract
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.
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