Cold to Neutral Tunable White Light Emission in Dy3+-Doped Al2(WO4)3 Phosphors

Synthesis and characterization of Dy3+-doped Al2(WO4)3 phosphors are reported. Phosphors were synthesized via simple evaporation technique, varying Dy3+ concentrations. X-ray diffraction confirmed the Al2(WO4)3 phase, with interplanar shifts attributed to Dy3+ incorporation. Raman spectroscopy identified vibrational modes of [WO4]2- at 400, 853, and 1067 cm-1. The direct optical band gap was determined experimentally (4.8 eV) and theoretically (4.75 eV), showing strong agreement. Photoluminescence (PL) studies revealed a broad excitation band at 255 nm, with maximum emission at 575 nm for 7.0 mol% Dy3+ content. The emission tonality ranged from cold to neutral white, with chromaticity coordinates (0.338, 0.359) at 5289 K under 255 nm excitation and (0.405, 0.416) at 3699 K under 350 nm excitation. These results demonstrate the potential of Dy3+-doped Al2(WO4)3 for tunable white-light applications.

Keywords: Al2(WO4)3-based phosphors, simple evaporation method, experimental and theorical energy gap comparison, DFT

Suggested Citation: Suggested Citation

Pérez-Ramos, P. A. and Soriano-Romero, O. and Lozada-Morales, R. and Meza-Rocha, A. N. and Licona-Ibarra, M. L. R. and Flores-Desirena, B. and Espinosa, J. E. and Carmona-Téllez, S., Cold to Neutral Tunable White Light Emission in Dy3+-Doped Al2(WO4)3 Phosphors. Available at SSRN: https://ssrn.com/abstract=5193959 or http://dx.doi.org/10.2139/ssrn.5193959