Luminescence studies and Judd Ofelt parameterization of Dy3+ activated La2(WO4)3 yellow phosphor.

[Display omitted] • Dy3+ doped La 2 (WO 4) 3 were prepared by microwave assisted co-precipitation method. • Judd Ofelt intensity parameters were calculated and they follow the trend Ω 2 > Ω 6 > Ω 4. • Emission spectra contain peaks due to the transitions 4F 9/2 → 6H 15/2,13/2. • The optimum concentration of Dy3+ ions in La 2 (WO 4) 3 was found to be 10%. • CIE coordinates confirm the suitability of the phosphor for yellow emission. The synthesis and detailed luminescence studies of a series of La 2-x Dy x (WO 4) 3 (x = 0.02, 0.1, 0.2, 0.4, 0.6, 0.8) phosphors synthesized via microwave-assisted co-precipitation technique is reported in this paper. The XRD analysis confirmed that the phosphors were crystalized in a monoclinic structure with space group C 2/ c and FTIR analysis identified the characteristic vibrational modes. Morphological studies were conducted using FESEM analysis, and the EDS technique substantiated the effective incorporation of Dy3+ ions in La 2 (WO 4) 3. The photoluminescence excitation and emission spectra of varying concentrations of Dy3+ ions were recorded and an optimum concentration of 10% exhibited the highest intensity. The emission spectra of all phosphors were dominated by peaks at 484 nm and 574 nm. The radiative properties were evaluated using Judd-Ofelt analysis and the JO intensity parameters followed the trend Ω 2 > Ω 6 > Ω 4. The gradual decrease in the decay lifetime value of 4F 9/2 excited level with an increase in doping concentration elucidates concentration quenching phenomena due to dipole – quadrupole interaction. The emission data were also analyzed by calculating CIE coordinates and concluded that Dy3+ doped La 2 (WO 4) 3 phosphors have potential applications in yellow light generation. [ABSTRACT FROM AUTHOR]