Spectral Analysis of Ho3+ Doped Barium Zinc Boro-Tellurite Glasses for Yellow-Green Luminescent Applications

Abstract

In this work, glasses of composition (30 – x)TeO₂–30B₂O₃–10ZnO–30BaO–xHo₂O₃x = 0.00 0.05, 0.10, 0.50, 1.00, 1.50 mol % have been prepared through the melt quenching method. In order to characterize and explore their structural properties, we measured the density, refractive index of the glass which shows increasing trend with increase in Ho₂O₃ concentration also FTIR and XRD spectrum is used to study the structural properties of the developed glasses. XRD shows amorphous structure of the prepared glasses. FTIR shows B–O stretching (BO)^3– units and Symmetrical stretching vibration of Te–O in TeO₃. The electronic states belonging to the 4f configuration of trivalent Ho³⁺ were determined from the absorption spectra. Judd–Ofelt (JO) intensity analysis had been performed for oscillator strength and JO parameters were estimated to be Ω₂ > Ω₆ > Ω₄. The emission spectra of the Ho doped glass samples were monitored at λ_exi = 454 nm. In the PL spectra, the characteristic emission bands due to f–f transition of Ho³⁺ were confirmed for the glass system, the transition ⁵I₈ → ⁵G₆ of Ho³⁺ ion is a hypersensitive transition and hence host dependent. For the transition ⁵F₄ → ⁵I₈ stimulated emission cross section is found to be 1.79 × 10^–22 cm².