Influence of Bi₂O₃ ,Sb₂O₃ and Y₂O₃ on optical properties of Er₂O₃ -doped CaO-P₂O₅-B₂O₃ glasses

The glasses of the composition 25CaO–10 (M₂O₃) –14P₂O₅-50B₂O₃ : 1Er₂O₃ (where M = Bi/Sb/Y) are prepared. The prepared samples are characterized by XRD, thermoluminescence (TL), UV and photoluminescence (PL) techniques. TL reports suggest that the sample of 10 mol% Y₂O₃ concentration (E_Y) exhibiting good shape symmetry factor (u = 0.484) and low AEs (E τ = 1.189, E δ = 1. 218 and E ω = 1.210) under γ -irradiation might be a good TL asset. The optical absorptions of present glasses are studied well through the Judd–Ofelt theory. The evaluations such as Judd–Ofelt parameters are additionally projected. They are found to be the best (Ω₂ = 1 . 62 × 10⁻²¹cm², Ω 4 = 1.56 × 10⁻²¹ cm² and Ω₆ = 0 . 59 × 10⁻²¹ cm² ) for the sample of 10 mol% Y₂O₃ concentration (E_Y), which may be a good optical asset to develop a novel class of laser resources. The radiative evolutions corresponding to the emissive transition ⁴S_3/2 → ⁴I_15/2 are assessed by PL technique. The evaluations are found to be the best (A_t = 7089 s − 1 , τ_rad = 140 μ sand β = 96 . 1%) for the sample of 10 mol% Y₂O₃ concentration (EY), which may be a useful luminescent resource. (author)