Structural, photoluminescence and energy transfer investigations of novel Dy → Sm co-doped NaCaPO phosphors for white-light-emitting diode applications.

In this study, Dy-doped and Dy/Sm co-doped NaCaPO white-emitting polycrystalline phosphor samples were synthesized using a solid-state reaction method. The samples were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Field-emission scanning electron microscopy (FE-SEM), and Photoluminescence (PL) analysis. The phase purity characterization and crystal structural analysis were done using the Rietveld refinement-based FullProf Suite software.