Investigation on the spectral downshifting features of trivalent Terbium ion-activated BaO-ZnF2-K2O-SiO2-B2O3 glasses for display devices and green laser applications

The present work details the concentration-dependent luminescence features under UV excitation shown by a series of Tb³⁺-activated multicomponent borosilicate glasses (BaO-ZnF₂-K₂O-SiO₂-B₂O₃) prepared via the melt-quench technique. XRD and FTIR spectra reveal the amorphous nature and the presence of various structural units such as B-O, Si–O-B, and Si-O-Si in the prepared glasses. Absorption studies identified the characteristic Tb³⁺ absorption transitions from the samples and were further used for the evaluation of nephelauxetic ratio, bonding parameter, and the Judd–Ofelt intensity parameters of the system. The photoluminescence excitation, emission, and decay curves confirmed the intense green emission corresponding to the ⁵D₄ → ⁷F₅ transition from the as-prepared glasses. The CIE color coordinates comparable to those of European Broadcasting Union illuminant green (0.29, 0.60) and better radiative features suggest that the Tb³⁺-incorporated BaO-ZnF₂-K₂O-SiO₂-B₂O₃ glasses are suitable for green-emitting photonic device applications.