Absorption and photoluminescence spectra of some rare earth doped B2O3-TeO2-BaO-R2O (R = Li, Na, Li+Na) glasses

This paper reports the preparation and optical characterisation of certain rare earth (Sm3+, Dy3+, Eu3+) doped borotellurite glasses of the following composition: B2O3-TeO2-BaO-R2O-REF3 where R = Li, Na and Li + Na; RE = Sm3+, Dy3+ and Eu3+. From the measured spectra, absorption band intensity parametrisation and luminescence characteristic parameters have been evaluated for the glasses investigated. Under a UV source, it was observed that Sm3+ doped glasses have been luminescing in greenish-yellow, Dy3+ glasses in yellowish-blue and Eu3+ glasses in red colours. These optical glasses are found to be IR-transmitting (up to 4.5 mu m) with good transparency and sufficient hardness. (C) 1997 Elsevier Science Ltd.