Optical spectroscopy and waveguide fabrication in Sm 3+/Tb 3+ doped zinc-sodium-aluminosilicate glasses

A spectroscopic investigation of sodium-zinc-aluminosilicate glasses activated with Sm 3+ and Tb 3+/Sm 3+ ions is performed through their luminescence spectra and decay times. Yellowish-green light emission, with x = 0.37 and y = 0.58 CIE chromaticity coordinates, is obtained in the Tb 3+/Sm 3+ codoped glass excited at 318 nm. Such yellowish-green emission is generated by the simultaneous emission of Tb 3+ and Sm 3+ ions, samarium being sensitized by the terbium through a non-radiative energy transfer. From spectroscopic data it is inferred that this energy transfer takes place between Tb 3+ and Sm 3+ clusters through a short-range interaction mechanism. Optical waveguides are also effectively produced in the glasses by Ag +-Na + ion exchange