Study on fabrication and luminescent properties of red long-lasting phosphor CBC∶Eu,Bi

Novel red long persistent phosphors of CaCO3-B2 O3-CaCl2(CBC):Eu,Bi have been synthesized at high temperature of slide-state and weak reductive atmosphere.The prepared CBC ∶Eu,Bi phosphor was characterized with scanning electron microscopy,X-ray diffraction, photoluminescence and afterglow decay curve.The long persistent phosphor emits intense red long-lasting phosphorescence for a longer time after irradiation by UV light.By the luminescence spectra analysis,the long persistent phosphor emission spectrum shows a red broader emission peak at 631nm that attributed to Eu2+ions transition from 4f65d1→4f7 when excited by 284nm and 463nm;there are some red sharp emission peaks which belong to Eu3+ions transition from 5 D0-7FJ(J=1,2,3,4)besides above-mentioned transition.