Eu³⁺ Site Distribution and Local Distortion of Photoluminescent Ca₃ WO₆ :(Eu³⁺ , K⁺ ) Double Perovskites as High-Color-Purity Red Phosphors.

ABSTRACT: In this study, Eu³⁺ and K⁺ co-doped Ca₃ WO₆ double perovskite, a high-color-purity red phosphor, is quantitatively investigated using synchrotron X-ray diffraction Rietveld refinement, energy dispersive X-ray spectroscopy, and high-resolution PL spectroscopy. The Eu³⁺ fluorescence line-narrowing (FLN) results, used to estimate the Eu³⁺ occupation at given sites (so-called A and B sites) in the host crystal (A₂ BMO₆ ; A, B = Ca; M = W), reveal that the Eu³⁺ ions have a twin distribution in both the A and B sites with high asymmetry ratios of Λ_A  = 9.7 and Λ_B  = 10.7, respectively. More interestingly, at lower Eu³⁺ doping levels, the ions are predominantly locat

SUBMITTER: Otsuka T 

PROVIDER: S-EPMC10625125 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature