Abstract
Upconversion characteristics of Tm3+-Er3+ codoped tellurite glasses were investigated and the snsitization of Tm3+:1G4→3H6(480nm) luminescence and quenching of Tm3+:1D2→3F4(450nm) were observed by the 650nm pumping. The change of upconversion luminescence specta by Tm3+-Er3+ codoping was investigated as a function of rare-earth ions concentration. It is found that the intensity of Tm3+:480nm blue upconversion luminescence was largest in the case of Er3+/Tm3+=1-2. These results were discussed by considering the energy transfer efficiency between Tm3+:3H4→Er3+:4I9/2 and Er3+:4I13/2→Tm3+:3F4.
