Structural And Photoluminescence Characteristics Of Pbo-M2o3(M2o3 = Al2o3, Sb2o3 And Bi2o3)-Wo3-B2o3: Sm2o3 Glasses Suitable For Orange-Red Lasers

PbO-M2O3(M2O3 = Al2O3, Sb2O3 and Bi2O3)-WO3-B2O3:Sm2O3 glasses are synthesized by the traditional method of melt-quenching. The glassy nature and glass structural units are characterized by XRD and FTIR studies respectively. The Judd-Ofelt theory is successfully applied to absorption and emission transitions of Sm3+ ions. The values of Omega(lambda), have shown the following order: Omega(4) > Omega(6) > Omega(2), which confirm the covalent nature of Sm-O bonds and excellence rigidity of the samples. Radiative properties of Sm3+ ions viz., branching ratio (beta(r)) experimental life time (tau(exp)), quantum efficiency (eta) and rate of non-radiative decay (W-NR) are evaluated. The glass containing Bi2O3 shows good deed of host environment around Sm3+ ions for possible orange-red laser transition (4)G(5/2) -> H-6(7/2) (approximate to 600 nm).