Eu(iii)-Doped tri-calcium Ca3(1−X−Z)MZ(PO4)2AX:X host array: optical investigations of down-conversion red phosphor for boosting display intensity and high color purity

Abstract

Eu³⁺-Activated double and triple phosphates were synthesized via a high-temperature solid-state reaction. These phosphors were characterized using X-ray diffraction (XRD), SEM (scanning electron microscopy), Fourier-transform infrared spectroscopy (FTIR) and photoluminescence spectra. XRD and FTIR analysis indicated that the prepared phosphors crystallized as a single-phase component. The present investigation aimed to analyze the influence of europium-activated hosts on luminescence sensitivity in a Ca₃(PO₄)₂ principal host. Under UV light excitation, the phosphors show bright red emission, which is assigned to the transition (⁵D₀ → ⁷F₂) at 612 nm. The crystallographic sites of the Eu³⁺ ions in the principal host were discussed on the basis of site-selective excitation and emission spectra and the host crystal structure. Upon tuning the host matrices, an outstanding increase in luminescence sensitivity is observed in the present investigation.