Tm3+激活无水芒硝在真空紫外光激发下的发光性质

摘要

The Na2SO4: Tm3+ phosphor was synthesized by the high temperature solid state reaction method in air. The crystalline structure was examined by X-ray diffraction (XRD). Narrow bands observed in emission spectra were well identified with the electronic transitions within the 4f2 configurations of Tm3+ , and the excitation spectrum is consisted of strong bands assigned to the 4f12→4f11 5d transition at 183 nm, the O2 -Tm3+ charge transfer band at 170 nm and weak bands assigned to host absorption (130, 223 and 258 nm). In addition, the authors also found that the content of Tm3+ in the 8～16 mg concentration range caused quenching.%采用高温固相反应方法在空气中制备了Na2SO4:Tm2+发光材料.用X射线衍射对晶体结构进行了表征.发射光谱由Tm3+内4f12电子跃迁的窄峰组成.激发光谱分别由Tm3+离子4f12→4f115d跃迁(183nm),O2--Tm3+之间的电荷转移带(170 nm)引起的强激发谱和基质吸收(130,223,258 nm)引起的弱激发谱组成.TmF3激活无水芒硝在真空紫外的激发光谱在浓度大于8 mg时有猝灭现象.