Optical analysis of RE3+ (RE = Nd or Er):B2O3–P2O5–CaF2–ZnO–(Li2O/Na2O/K2O) glasses

Calcium boro fluoro zinc phosphate glasses modified using alkali oxide and doped with Nd³⁺ and Er³⁺ ions with the chemical composition of 69.5 (B₂O₃) + 10 (P₂O₅) + 10 (CaF₂) + 5 (ZnO) + 5 (Na₂O/Li₂O/K₂O) + 0.5 (Er₂O₃/Nd₂O₃) were prepared using a conventional melt quenching technique. The results of X-ray diffraction patterns indicated the amorphous nature of all the prepared glasses. The visible–near-infrared red (NIR) absorption spectra of these glasses were analyzed systematically. The NIR emission spectra of Er³⁺ and Nd³⁺:calcium boro fluoro zinc phosphate glasses showed prominent emission bands at 1536 nm (⁴I_13/2→⁴I_15/2) and 1069 nm (⁴F_3/2→⁴I_11/2) respectively with λ_exci = 514.5 nm (Ar⁺ laser) as the excitation source.     

Structural,photoluminescence, and optical characteristics of a Sm3+-doped lead borate–strontium–tungsten glass system: Evaluation of Judd–Ofelt intensity parameters and radiative properties

In this study, the melt quenching approach is used to synthesize a lead borate–strontium-based glass system doped with samarium ions. Modifications in the glass network structure arising from the addition of various concentrations of Sm³⁺ ions were investigated via Fourier transform infrared (FTIR) spectroscopy. FTIR analysis revealed B–O–B bridges, BO₃, and BO₄ units are present. UV–vis–NIR spectroscopic measurement was performed to study the optical absorption spectra. Optical constants such as optical bandgap energies, refractive indices, and other related parameters were evaluated. The lifetime fluorescence decay was measured and ranged between 1.04 and 1.88 ns. The photoluminescence spectra in the range 500–750 nm revealed four transitions from the ground state ⁶G_5/2 to the excited states ⁶H_5/2, ⁶H_7/2, ⁶H_9/2 and ⁶H_11/2 and J–O theory was utilized to study these optical transitions for Sm³⁺ ions. Calculations of the oscillator strengths and J–O intensity parameters were performed and the obtained J–O parameters followed the sequence Ω₄ > Ω₆ > Ω₂. The ratio O/R indicated a high lattice asymmetry around the samarium ions. The values of lifetimes and branching ratios for the fabricated samples emphasized their suitability to be used in laser applications. The current glass samples are good candidates for orange and red emission devices.