Fabrication and Luminescent Properties of Ca2YSbO6: Sm3+, Dy3+ Double-Perovskite Phosphors

Double-perovskite Ca 2 YSbO 6 phosphors doped with Dy 3+ /Sm 3+ were prepared by high-temperature solid-state reaction method. The phase structure of the samples was characterized by X-ray diffraction (XRD), and the microscopic morphology, microstructure, luminescence characteristics and energy transfer process of the Ca 2 YSbO 6 phosphor samples were systematically studied by means of scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), fluorescence spectroscopy and lifetime testing. Dy 3+ /Sm 3+ have been incorporated into the Ca 2 YSbO 6 (CYSO) crystal lattice, exhibiting a homogeneous distribution of elements throughout the structure. Ca 2 YSbO 6 : Sm 3+ , Dy 3+ phosphors exhibit intense red and yellow emission peaks at 601 nm and 565 nm, respectively. The luminescent performance of Ca 2 YSbO 6 : Sm 3+ , Dy 3+ phosphors is the highest when the doping concentrations of Sm 3+ and Dy 3+ are 0.03 mol and 0.04 mol. By adjusting the Dy 3+ concentration and utilizing its energy transfer to Sm 3+ , tunable emission from orange-red to yellow was achieved for the CYSO: 0.03 mol Sm 3+ , y mol Dy 3+ phosphor. Under 407 nm excitation, the Internal Quantum Efficiency (IQE) of the phosphor is 27.75%. Additionally, Variable-temperature emission spectroscopy further confirmed that the co-doped phosphor has obvious anti-thermal quenching properties. It still has 54.46% of the original luminous intensity at 423 K. The white light-emitting diodes (W-LEDs) demon-strated a high color rendering index (Ra) of 88 and a suitable correlated color temperature (CCT) of 5994 K. These results show that the proposed phosphor has great application potential in supplementing the red-light components of LED lighting.