Abstract. Terbium doped (Tb³⁺) and undoped PVA/PVP blended polymer films were successfully prepared using solution casting method. X-ray diffraction (XRD) analysis revealed that the prepared films exhibit semi-crystalline nature. Fourier Transform Infrared (FTIR) spectroscopy was used to study the formation of polymer complexes and interactions between Tb³⁺ ions and polymer functional groups. Photoluminescence (PL) measurements, emission and decay profiles, were carried out to study the luminescent behavior of the films. The PL spectra showed a strong green emission peak centered at 543 nm, which corresponds to the ⁵D₄ → ⁷F₅ transition of the Tb³⁺ ion, under 370 nm. The luminescence decay curves were non-exponential decay curve suggested the presence of energy transfer processes and interactions between the Tb³⁺ ions in the host matrix. In addition, the chromaticity coordinates of the Commission Internationale de l'Eclairage (CIE) confirmed that the green light emission dominance of in the Tb³⁺ doped PVA/PVP films. Among the different concentrations of doped films, the film doped with Tb³⁺ with 0.5 wt% showed the best luminescent performance. This implies the potential viability of the material as a promising candidate for green-emitting for photonic devices and optoelectronic devices such as, light-emitting diodes, lasers and display technologies.

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