Synthesis and optical properties of KCaPO4:Eu2+ phosphor

Abstract A series of Eu 2+ doped KCaPO 4 phosphors were prepared by high temperature solid state reaction and an efficient blue–green emission was observed. The photoluminescence (PL) spectrum of the phosphor appeared one asymmetric peak under near-ultraviolet (n-UV) excitation and two emission bands at 480 nm and 540 nm were obtained using Gaussian fit, which was because Eu 2+ ions inhabited two different Ca 2+ sites: Eu(I) and Eu(II) in the host lattice, respectively. The excitation spectrum was a broadband extending from 250 to 450 nm, which matched well with the emission of ultraviolet light-emitting diodes (UV LEDs). The effect of Eu 2+ concentration on the emission intensity of KCaPO 4 :Eu 2+ phosphor was investigated in detail.