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 cer tain 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 paramet ers have been evaluated for the glasses investigated. Under a UV sourc e, it was observed that Sm3+ doped glasses have been luminescing in gr eenish-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 Els evier Science Ltd.