Spectroscopic Studies of RE3+(RE = Eu, Tb, Sm & Dy): Lithium Lead Boro Tellurite Glasses

Abstract

0.25, 0.5, 1.0 and 2.0 mol% of rare earth ions (Eu3+, Tb3+, Sm3+and Dy3+) doped lithium lead boro tellurite glasses have been prepared. From the measured absorption and emission spectra, optical properties have been studied. The absorption spectrum of Eu3+: glass has shown three absorption bands at 394 nm, 465 nm and 533 nm, Tb3+: glass has shown a weak absorption band at 484 nm, Sm3+: glass has shown nine absorption bands at 477 nm, 563 nm, 946 nm, 1081 nm, 1231 nm, 1378 nm, 1482 nm,1525 nm and 1589 nm, Dy3+: glass has shown six absorption bands at 751 nm, 797 nm,900 nm, 1091 nm, 1274 nm and 1680 nm. From Eu3+: glasses, a red emission at 612 nm (5D0 → 7F2) with λexci = 392 nm, Tb3+: glasses, a green emission at 543 nm (5D4 → 7F5) with λexci = 376 nm, Sm3+: glasses, an orange-red emission at 598 nm (4G5/2 → 6H7/2) with λexci = 401 nm and also from Dy3+: glasses, a yellow emission at 574 nm (4F9/2 → 6H13/2) with λexci = 451 nm have been observed. For all these emission bands decay curves have been plotted to evaluate their life times and the emission mechanism that arised in the glasses have been explained in terms of energy level diagrams.