Blue emission stimulated by Dy3+ transitions in KCaF3: A fluoride-based phosphor

Abstract

In this work, the luminescence characteristics of KCaF₃:xDy³⁺ phosphors are examined. A solid-state method was used to synthesize the phosphors. KCaF₃:xDy³⁺ phosphors with orthorhombic structure were confirmed by X-ray diffraction (XRD). Scanning electron microscope (SEM) images of the synthesized phosphors show agglomerated particles with irregular shapes. The composition of the synthesized sample was determined by the energy dispersive spectroscopy (EDS) spectra, and the spectra showed the presence of all elements in the grown phosphors. Photoluminescence (PL) studies revealed peaks at 486 and 578 nm, corresponding to blue and yellow emissions. The Commission Internationale de l’Éclairage (CIE) diagram illustrates that Dy3⁺-doped KCaF₃ phosphors are clustered in the blue color region.