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Eu³⁺和Tb³⁺掺杂的Y₂SiO₅体系发光特性研究

Luminescence of Eu³⁺ and Tb³⁺ Doped Y₂SiO₅ System

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【Author】 ZHAO Fengying1, ZHOU Jianguo1,2, ZHAO Baolin3, LI Zhenquan1, GAO Shiyang1,2,4(1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang453002, China;2. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou730000, China;3. Zhengzhou College of Animal Husbandry Engineering, Zhengzhou450000, China;4. Xi′an Branch, Institute of Salt Lakes, Chinese Academy of Sciences, Xi′an710043, China)

【机构】河南师范大学化学与环境科学学院；郑州牧业高等专科学校；河南师范大学化学与环境科学学院河南新乡　453002；河南新乡　453002；兰州大学化学化工学院；甘肃兰州　 73 0 0 0 0；河南郑州　450000；河南新乡　453002；河南新乡　453002；甘肃兰州　 73 0 0 0 0；中国科学院盐湖研究所西安二部；陕西西安　710043；

【摘要】采用溶胶凝胶法合成了Eu3+和Tb3+掺杂的Y2SiO5基发光材料。通过测量它们的激发光谱和发射光谱,研究了它们的发光特性,探讨了材料中Tb3+和Eu3+两种发光中心间的能量传递关系。结果表明,Eu3+在其中的特征发射以5D0→7F2电偶极跃迁为主,Eu3+处于非反演对称中心格位;Tb3+在其中的发射为5D4→7FJ(J=4～6)跃迁发射。当Eu3+和Tb3+共存于Y2SiO5基质中时,Eu3+的发射增强,Tb3+的发射减弱,存在Tb3+→Eu3+能量传递,Tb3+对Eu3+具有敏化作用。更多还原

【Abstract】 Silicate of type Y2SiO5 is wellknown host for the activation with trivalent rare earth ion. The luminescence of these phosphors are very efficient both under cathode ray and UV excitation. But, Y2SiO5∶Eu3+does not complete that series, it shows a moderate red luminescence.It was found the red emission can be enhanced considerably by the simultaneous introduction of a high concentration of Tb3+. The luminescent materials with Eu3+ and Tb3+ codoped were synthesized by solgel process,using TEOS and Y2O3 and Eu2O3.The luminescence of Eu3+ and Tb3+ in Y2SiO5 were studied, using Eu3+ and Tb3+ codoped samples. Energy transfer studies have been made also in Eu3+ and Tb3+ codoped Y2SiO5 system. The results show that Y2SiO5∶Eu3+ yields a moderate brightness, the emission comes from 5D0 with the hypersensitive transition 5D0→7F2 as the most prominent group at about 611nm. The Tb3+ emission is mainly from 5D4→7FJ(J=4～6) and a smaller contribution from 5D3→7FJ(J=4～6) transitions in Y2SiO5. Sensitization of Eu3+ emission by Tb3+ is possible in Y2SiO5 hosts. The introduction of a small Tb3+ concentration results in the simultaneous emission of Tb3+ and Eu3+. The efficiency is enhanced considerably by simultaneous introduction of a high Tb3+ concentration. Enhancement of the Eu3+(5D0→7F2) emission and a decrease of the Tb3+ emission have been observed as a result of energy transfer from Tb3+ ion to Eu3+ ion. In the spectra, the spectral positions of the Tb3+ emissions and the Eu3+ excitation bands have good energetic overlap for several spectral regions, the excited levels 5D4 of Tb3+ and 5D0 of Eu3+ are involved. The observed strong enhancement of the Eu3+ emission for high Tb3+ content is easily explained by the energy transfer effect.更多还原