【摘要】 本文报道了Ln7O6(BO3) (PO4 ) 2 ∶Eu(Ln =La ,Gd ,Y)在VUV UV区的激发光谱及Eu3 + 在可见区的发射光谱。其激发光谱包括基质在真空紫外区的激发带和激活剂离子在紫外区的Eu3 + O2 -电荷迁移带 ,随La3 + ,Gd3 + ,Y3+ 离子半径逐渐减小 ,Eu3 + O2 -电荷迁移带的重心位置逐渐向高能量方向移动 ,Gd7O6(BO3) (PO4 ) 2 ∶Eu和Y7O6(BO3) (PO4 ) 2 ∶Eu在真空紫外区的吸收与Eu3+ O2 -电荷迁移带位于紫外区的吸收的比值要高于在La7O6(BO3) (PO4 ) 2 ∶Eu中的这个比值。激发能可被基质吸收 ,传递给激活剂离子 ,得到Eu3 + 的红光发射。在Gd7O6(BO3) (PO4 ) 2 ∶Eu中 ,5D0 →7F1的发射强度较强 ,在Y7O6(BO3) (PO4 ) 2 ∶Eu中 ,5D0→7F2 和5D0 →7F3的跃迁较强。更多还原

【Abstract】 Eu 3+ doped materials has made an important role in the PDP, but the color purity and fluorescent efficiency of the materials now available can not be satisfactory. To look for better materials, the fluorescent properties of Ln 7O 6(BO 3)(PO 4) 2∶Eu( Ln =La,Gd,Y) have been studied. The samples were synthesized by high temperature solid phase technique. The structures of the samples were complicated, it was showed by the infrared absorption spectra that the basic structure unit are 3- and 3- , but because there are interaction between of 3- and 3- , the radius of Eu 3+ ions is different from the La 3+ , Gd 3+ , Y 3+ ions, and there exists other anion group, etc., the absorption spectra of Ln 7O 6(BO 3)(PO 4) 2∶Eu are not entirely the same as that of Ln BO 3 and Ln PO 4 doped with Eu. The excitation spectra in the region of VUV UV and the emission spectra in the visible region were studied. The excitation spectra are consisted of the Eu 3+ O 2 charge transfer band and the host absorption band. The location of the Eu 3+ O 2 charge transfer band shifted to the high energy with the radius of the La 3+ , Gd 3+ , Y 3+ decreasing; in the excitation spectra of the Gd 7O 6(BO 3)(PO 4) 2∶Eu and Y 7O 6(BO 3)(PO 4) 2∶Eu , the ratio between the absorption in the VUV region and in the Eu 3+ O 2 charge transfer band is higher than that in the La 7O 6(BO 3)(PO 4) 2∶Eu; there is high absorption at 147nm in the Y 7O 6(BO 3)(PO 4) 2∶Eu. When excited into the host, the excitation energy was absorbed by the host then transferred to the Eu 3+ ions, so the red emission of Eu 3+ was obtained. In the emission spectrum of Gd 7O 6(BO 3)(PO 4) 2∶ Eu, 5D 0 → 7F 1 transition is strong, so this material is not fit to be applied to the PDP. In the emission spectrum of Y 7O 6(BO 3)(PO 4) 2∶Eu , the 5D 0 → 7F 3 transition is stronger than that in the Gd 7O 6(BO 3)(PO 4) 2∶Eu and La 7O 6(BO 3)(PO 4) 2∶Eu, and in the VUV region, Y 7O 6(BO 3)(PO 4) 2∶Eu has good absorption also, so Y 7O 6(BO 3)(PO 4) 2∶Eu has practical application value.更多还原