Correlation of structure and luminescence in Ca3La2W2O12: Eu3+ phosphors for advanced display technologies validated using Judd-Ofelt theory

In this study, we present a comprehensive analysis of the crystal structure, photoluminescence properties, and Judd-Ofelt parameters of Ca3La2W2O12:Eu3+ phosphor. The phosphors were meticulously synthesized via the solid-state reaction (SSR) method. Powder X-ray diffraction (PXRD) analysis confirmed that the phosphors crystallize in a hexagonal crystal system with the space group R3m and Raman shift from 324 to 336 cm-1 could be correlated with the structural and electronic changes after Eu-doping. The Ca3La2W2O12:Eu3+ phosphors exhibited a prominent red emission peak at 617 nm, which corresponds to the 5D0 -> 7F2 transition of Eu3+, under 464 nm excitation linked to the 7F0 -> 5D2 transition. Furthermore, the quantum efficiency of the synthesized phosphors reached its maximum at a 5 mol% Eu3+ concentration. The chromaticity coordinates, color purity, and correlated color temperature (CCT) for this optimal concentration were (0.60, 0.40), 79.63%, and 1712.79 K, respectively. Additionally, theoretical calculation is used to describe and quantify the intensity of electric-dipole transitions using Judd-Ofelt (J-O) theory. From the J-O analysis, we calculated the radiative transition rates, stimulated emission cross-sections, and branching ratios. The comprehensive characterization and favorable photoluminescent properties of Ca3La2W2O12:Eu3+ phosphors underscore their potential as superior red-emitting materials for integration into white light-emitting diodes (w-LEDs). These findings could pave the way for advancements in solid-state lighting technologies, highlighting the significant impact of optimized Eu3+ doping concentrations on the performance of phosphor materials.