KBaPO4∶Eu3+红色发光材料的光谱特性

采用高温固相法制备了KBaPO4:Eu3+红色发光材料,研究了Eu3+掺杂浓度、电荷补偿剂等对材料发光性质的影响,并利用X射线衍射及光谱等技术对材料的性能进行了表征.研究结果显示:在400 nm近紫外光激发下,材料呈多峰发射,分别由Eu3+的5D0→7FJ(J=0,1,2,3,4)能级跃迁产生,主峰位于621 nm|监测621 nm发射峰,所得激发光谱由O2-→Eu3+电荷迁移带(200~350 nm)和f-f高能级跃迁吸收带(350~450 nm)组成,主峰位于400 nm|改变Eu3+掺杂浓度,KBaPO4∶Eu3+材料的发射强度随之改变,Eu3+浓度为5 mol%时,强度最大|依据Dexter理论,得知引起浓度猝灭的原因为电偶极-电偶极相互作用|添加电荷补偿剂,可增强KBaPO4∶Eu3+材料的发射强度,其中以添加Li+,Cl-时,材料发射强度提高最明显.

Spectral Characteristics of KBaPO4:Eu3+ 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-.