Spectral Characteristics of KBaPO_4:Eu~(3+) Red Emitting Phosphor

KBaPO4∶Eu3+ phosphor was synthesized by the high temperature solid state reaction method,and the effects of Eu3+ concentration and charge compensators on the luminescent characteristics of the phosphor were investigated.The phase present of the samples was characterized by powder X-ray diffraction(XRD)(D/max-rA,Cu Kα,40 kV,40 mA,λ=0.15406 nm).The excitation and emission spectra of these phosphors were measured by a SHIMADZU RF-540 fluorescence spectrophotometer.The research results show that under 400 nm excitation,the phosphor presents several emission peaks,which correspond to the 5D0→7FJ(J=0,1,2,3,4) transition of Eu3+,respectively,and the highest emission locate at 621 nm;monitored at 621 nm emission,the excitation spectrum contains 200~350 nm and 350~450 nm two excitation bands,which correspond to a weak charge transition broad band absorption CTS and a strong f-f transition absorption of Eu3+,respectively,and the highest peak locates at 400 nm;the emission intensity of the phosphor was influenced by the Eu3+ concentration,and it reaches the maximum at 5 mol% Eu3+;the concentration quenching occurs when the Eu3+ concentration is beyond 5 mol%,and the concentration self-quenching mechanisms are the d-d interaction by Dexter theory;under the conditions of charge compensator incorporated in the phosphor,the emission intensity can be enhanced,and can obtain the prime function with doping Li+ or Cl-.