Dy 3+ doped KCa(PO 3 ) 3 phosphor for white light generation: structural and luminescent studies

Using the traditional solid-state reaction approach, Dy 3+ ions doped KCa(PO 3 ) 3 phosphors have been synthesized to investigate their luminescent properties to produce high-quality white light for solid-state lighting applications, particularly in white LEDs. x-ray diffraction (XRD) patterns were used to examine the structure and phase of the phosphors. Using scanning electron microscopy (SEM), the morphology of the as-synthesized phosphor has been investigated. Fourier transform infrared spectroscopy (FT-IR) has been used to investigate several vibrational bands seen in the phosphor. Using diffuse reflectance spectra (DRS), the as-synthesized phosphors’ optical band gap values have been estimated. When Dy 3+ ions are excited at 350 nm, the photoluminescence (PL) spectra characteristics observed for the activated KCa(PO 3 ) 3 phosphor show strong white area emission due to both 575 nm, which is related to the 4 F 9/2 → 6 H 13/2 and 482 nm that is ascribed to 4 F 9/2 → 6 H 15/2 transition of Dy 3+ ions. Additionally, the concentration quenching of Dy 3+ ions doped at 4 mol% is seen in the PL spectra. Based on the observed PL spectra, the computed CIE chromaticity coordinates for the optimised KCa(PO 3 ) 3 phosphors are located in the deep white area. The lifespan of the as-titled phosphors decreases as the amount of Dy 3+ ions increases in the host lattice. Additionally, the PL decay profiles shows a dual exponential behaviour when excited at 350 nm, with an emission wavelength at 575 nm. The lifetime values were used to calculate the quantum efficiency of the as prepared phosphors. On the basis of the results of the aforementioned studies, we wish to project Dy 3+ ion doped KCa(PO 3 ) 3 phosphors as white light generating materials in w-LEDs and for other photonic applications.