K^+掺杂对CaTiO_3:Eu^(3+)的荧光性能影响

Effect of charge compensator K^+ on the luminescene properties of Eu^(3+)-doped CaTiO_3

采用静电纺丝法合成K^+作为电荷补偿剂的CaTiO_3∶Eu^(3+)纳米纤维,采用X射线衍射仪、荧光光谱仪对材料的物相和发光性能进行了表征。样品的激发光谱由370~420nm的光谱组成,其中398nm的激发强度最大。发射光谱主要由位于617nm处的主峰(来源于~5D_o-~7F_2能级间的跃迁发射)及在589nm、652nm处的发光峰(分别来源于~5D_o-~7F_1、~5D_o-~7F_3能级间的跃迁发射)构成。掺入K^+有效提高了CaTiO_3∶Eu^(3+)纳米纤维的发光强度,发光强度随着掺杂浓度的增加而增加,掺杂K^+为5%时为浓度淬灭点。

Novel K＋ doped CaTiO3：Eu^3＋ red phosphors were synthesized by electrospinning method. The effects of charge compensatory ion K＋ on the phase and luminescent properties of red phosphors were investigated by X-ray diffraction and photoluminescence spectra. The excitation spectra include the band （370-420nm）. From emission spectra, it is observed that these phosphors exhibit three dominating bands situated at 617nm, 589nm, and 652nm, originating from the SDo-7F2, 5Do-TFI and SDo-7F3 respectively. The luminescence can be enhanced with the increase of K＋ content. Furthermore, the charge compensation mechanism was discussed.