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

• Published in: Journal of alloys and compounds 2025-01, Vol.1010, p.177382, Article 177382
• Main Authors: Pusdekar, Ashvini, Ugemuge, Nilesh S., Gayner, Chhatrasal, Nande, Amol, Moharil, Sanjiv
• Format: Article
• Language: English
• Subjects: Eu3; Judd–Ofelt; Luminescence; Phosphor; Tungstate
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2024.177382

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 R3̅m 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. [Display omitted] •Novel compound Ca3La2W2O12:xEu3+ synthesized and characterized for luminescence application.•Correlation of experimental results and theoretical calculation validates the abilities of Ca3La2W2O12:xEu3+ for advanced display technology.•Structural and electronic changes after Eu-doping demonstrate high quantum efficiency.