Glasses Technology

Judd-Ofelt parameters ?//t with t=2,4,5 for the rare-earth ions Pr^3+, Nd^3+, Sm^3+, Tb^3+, Dy^3+, Ho^3+, Er^3+, and Tm^3+ in alkali and/or alkaline-earth silicate, borate, and phosphate glasses have been determined. The variations of ?//t with the number of 4f electrons of the rare-earth ions are demonstrated, and factors affecting the Judd-Ofelt parameter ?//6 are discussed. The intensity parameter ?//6 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, 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 ?//6??U(6)??^2 term—where ??U(6)?? is one of the reduced matrix elements—shift systematically with the values of ?//6 for all the rare-earth ions.

Takebe, Hiromichi.?Nageno, Yoshikazu.?