No abstract

Optical properties of yttria-aluminoborate (YAB) glasses with general composition 10(Ce x Tb y Y (1-x-y))-30Al 2 O 3-60B 2 O 3 are investigated and compared with data available on YAB crystals with huntite-like structure. Ce doped samples show optical features ascribable to preferential location of rare earth ions in sites with specific geometry similar to that observed in crystalline structures. Samples prepared with Tb ions as emission activator and Ce ions as sensitizer have been studied within the framework of non-radiative energy transfer. The resulting Förster radius is of 4.6±0.5 Å comparable with that observed in Ce/Tb co-doped YAl 3 (BO 3) 4 crystals. The investigated materials possess radio-and photoluminescence emission efficiencies and performances comparable to that of crystalline counterparts with the advantage of having easiness of preparation and workability typical of glassy systems.