Intense broad-band absorption and blue-emitting Ca9La(PO4)5(SiO4)Cl2:Eu2+ phosphor under near-ultraviolet excitation

A series of novel luminescence phosphors Ca₉La(PO₄)₅(SiO₄)Cl₂:xEu²⁺ (CLPSCl:Eu²⁺) with apatite structure have been synthesized by a high temperature solid-state reaction. The phased purity of as-prepared phosphors was verified through XRD technique. For further discussion, a series of analysis were performed such as the photoluminescence emission and excitation spectrum and decay lifetime to identify the luminescent properties of CLPSCl:Eu²⁺ phosphors. The CLPSCl:Eu²⁺ displays broad excitation spectra ranging from 250 to 450 nm, and intends emission intensity at 461 nm under 345 nm. The optimum Eu²⁺ concentration of CLPSCl is 8 mol%. The luminescence decay lifetime of the optimum phosphors was measured to be 275 ns. All of the results obtained highly indicate that CLPSCl:Eu²⁺ is potentially blue-emitting phosphor for application in white LEDs.