Upconversion luminescence of Yb~(3+)/Tb~(3+) co-doped tellurite glasses

摘要

In the article the upconversion luminescence of TeO_2- GeO_2 - PbO - PbF_2- BaO - Nb_2O_5 - LaF_3 glass system co-doped with Yb~(3+)/Tb~(3+) under 976 run laser diode excitation was investigated. The influence of Tb_2O_3concentration on the luminescent properties was determined. Measured strong luminescence at492, 547, 588, 622 nm correspond to ~5D_4 → ~7F_J (J=6, 4, 3) transitions. Energy transfer (ET) mechanism involved in observed emission was discussed. The highest upconversion emission intensity was obtained in the tellurite glass co-doped with 0.5 Yb_2O_3/0.5 Tb_2O_3 (mol%).