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真空紫外光激发下Ce³⁺、Tb³⁺激活的BaCa₂（BO₃）₂的发光性质

Luminescence of Ce³⁺,Tb³⁺ Activated BaCa₂（BO₃）₂ under Vacuum Ultraviolet Excitation

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【Author】 LIN Hui-hong1,2,ZHANG Guo-bin3,LIANG Hong-bin1*(1.MOE Laboratory of Bioinorganic and Synthetic Chemistry,State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering,Sun Yat-sen University,Guangzhou 510275,China; 2.Department of Chemistry,Hanshan Normal University,Chaozhou 521041,China; 3.National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China)

【机构】中山大学生物无机与合成化学教育部重点实验室光电材料及应用国家重点实验室化学与化学工程学院；韩山师范学院化学系；中国科学技术大学国家同步辐射实验室；

【摘要】利用XRD、VUV及UV光谱等方法对Ce3+、Tb3+离子掺杂以及Ce3+、Tb3+离子共掺的3种BaCa2(BO3)2荧光粉的相纯度、发光性质、浓度猝灭现象进行研究。结果表明:3种荧光粉在VUV波段有较好的吸收,基质吸收带位于140～190 nm范围。Ce3+在BaCa2(BO3)2的最低4f5d跃迁带位置在360 nm附近,其5d→2FJ(J=5/2,7/2)发射峰分别位于393,424 nm。Tb3+掺杂的样品在172 nm激发下的发射光谱由4个窄带组成,分别对应5D4→7FJ(J=3,4,5,6)的跃迁,其中占主导位置的是5D4→7F5的跃迁,大约位于543 nm处,主要为绿光发射。在Ce3+,Tb3+离子共掺杂的BaCa2(BO3)2光谱中,观察到Ce3+-Tb3+离子间有能量传递。更多还原

【Abstract】 The luminescence properties of Ce3+,Tb3+ activated BaCa2(BO3)2 phosphors were investigated by vacuum-ultraviolet(VUV) and ultraviolet(UV) spectra.The phase purity was characterized by the powder x-ray diffraction(XRD).The results demonstrate that the band near 140-190 nm range in the VUV excitation spectra is ascribed to the host-related absorption.The lowest 5d state of Ce3+ in BaCa2(BO3)2 is located at 360 nm,and two emission bands from Ce3+ 5d→2FJ(J=5/2,7/2)were found at about 393,424 nm.The emission bands of Tb3+-doped BaCa2(BO3)2 consists of four components,which correspond to the 5D4-7FJ(J=3,4,5,6) transitions with the dominant 5D4-7F5 transition at 543 nm.The energy-transfer between Ce3+ and Tb3+ occurs in Ce3+,Tb3+ co-activated BaCa2(BO3)2 phosphors.更多还原