Synthesis and spectroscopic investigation of blue-emitting (SrCa)₂La (PO₄)₃O: Eu²⁺ phosphors

A novel broadband (SrCa)(2)La(PO4)(3)O: Eu2+ phosphor was successfully synthesized by the conventional hightemperature solid-state reaction. The samples are of phase purity demonstrated by XRD analysis. The photoluminescence properties of the (SrCa)(2)La(PO4)(3)O: Eu2+ phosphor were investigated systematically. Under the excitation of 365 nm near-ultraviolet light, the phosphors exhibit absorption in the ultraviolet-visible spectral region of 280-420 nm and show an intense asymmetric broadband blue emission peaking at around 460 nm. The different crystallographic sites of Eu2+ in (SrCa)(2)La(PO4)(3)O: Eu2+ phosphors have been verified via the photoluminescence properties. The concentration quenching mechanism, decay property, and thermal stability of the phosphor have been discussed in detail. The investigation results indicate that the as-prepared (SrCa)(2)La(PO4)(3)O: Eu2+ phosphor will have application potential in near-ultraviolet pumped white light-emitting diodes.