Comparative study of optical and luminescence properties of Sm³⁺-ions doped Li₂O–Gd₂O₃–PbO–SiO₂ and Li₂O-GdF₃-PbO–SiO₂ glasses for orange emission solid state device application

25Li₂O–05Gd₂O₃– 15PbO – (55-x) SiO₂:x Sm₂O₃ (LPOSm) and 25Li₂O–05GdF₃- 15PbO – (55-x) SiO₂:x Sm₂O₃ (LPFSm)glasses were prepared by melt quenching method. Optical, luminescence JO-parameters and radiative properties were studied using various techniques. While comparing Ω₂ parameter values between LPOSm05 and LPFSm05, the LPFSm05 glass has more asymmetric environment around Sm³⁺-ions and more covalency between Sm³⁺-O bonding then LPOSm05 glass. Moreover, LPFSm05 has higher value of branching ratio than LPOSm05 showing its suitability for laser active medium. The current investigation reveals that value of I_R/O-ratio for LPFSm05 is more than LPOSm05 showing its more asymmetric nature and more local disorder for Sm³⁺-ions than LPOSm05 glass. From evaluated results the CIE-color-coordinates for LPOSm and LPFSm glasses fall in orange region. The calculated value of prepared LPOSm and LPFSm glass are less than warm CCT (<4000 K). The lifetime of ⁴G_5/2state atλ_ext = 402 nm and λ_emi = 600 nm for LPOSm glasses is longer than LPFSm glasses. The dominant interaction responsible for non-exponential behavior for higher concentration in present glasses were found to be dipole-dipole type of interaction for energy transfer between donor (Sm³⁺) and acceptor (Sm³⁺) ions. From the present investigation it is suggested that presents glasses are suitable for orange light emitting devices (LEDs and laser).