Tb3+/Yb3+ heavily-doped tellurite glasses with efficient green light emission

Without introducing concentration quenching phenomenon a few wt % of Tb3+ and Yb3+ ions were doped into a group of easily-fiberized tellunte glasses characterized by loose polyhedron structures and rich interstitial positions Intense green upconversion emission from Tb3+ ions centered at 539 nm due to transition D-5(4) -> F-7(5) was observed by direct excitation of Yb3+ ions with a laser diode at 976 nm Optimizing the concentration ratio of Tb3+/Yb3+ a tellunte glass with a composition of 80TeO(2)-10ZnO-10Na(2)O (mol%) + 1 0 wt % Tb2O3 + 3 0 wt % Yb2O3 was found to present the highest green light intensity and therefore is especially suitable for efficient green fiber laser development (C) 2010 Elsevier BV All rights reserved