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铽配合物Tb（o-BBA）₃（phen）有机电致发光研究

Luminescent Mechanism for Tb（o-BBA）₃（phen）

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【Author】 Liu Ling~1,Xu Zheng~(1*),Lou Zhidong~1,Zhang Fujun~1,Sun Bo~2,Pei Juan~2(1.Institute of(Optoelectronics) Technology, Beijing Jiaotong University,Beijing 100044,China;2.Department of Materials Chemistry,College of Chemistry,Nankai University,Tianjin 300071,China)

【机构】北京交通大学光电子技术研究所；南开大学化学学院材料化学系；南开大学化学学院材料化学系北京100044；北京100044；天津300071；

【摘要】合成了一种新的稀土配合物邻苯甲酰苯甲酸-1,10-菲罗啉-铽(Tb(o-BBA)3(phen))并用于有机电致发光。研究了Tb(o-BBA)3(phen)与PVK混合薄膜的光致发光特性,找出了PVK∶Tb的最佳比例为3∶1。制备了结构为ITO/PVK∶Tb/Al的单层电致发光器件,得到了铽离子的特征光谱,其电流-电压特性(I-V)在一定电压范围内符合空间电荷限制电流机制。研究结果表明稀土铽配合物Tb(o-BBA)3(phen)掺杂PVK体系的光致发光是源于PVK到Tb配合物的能量传递及稀土Tb配合物的直接激发两种作用机制,而电致发光以载流子俘获为主。更多还原

【Abstract】 A rare earth complex of terbium ion with 2-benzoylbenzoic acid and 1,10phenathroline（Tb（o-BBA）₃（phen）,o-BBA=2-benzoylbenzoic acid,phen=1,10-phenathroline） was synthesized,and used as a luminescent material.The Tb complex was blended with poly（N-vinylcarbazole）（PVK） and spin coated into films（noted as PVK∶Tb films）.The photoluminescence（PL） properties of the films were investigated and the optimum ratio between PVK and Tb（o-BBA）₃（phen） was founded to be 3∶1.Monolayer devices with the structure ITO/PVK∶Tb/Al were fabricated and emitted green light,which was characteristic of Tb³⁺ emission.The results show that the mechanisms for PL and EL are different.The PL is considered to be energy transfer and the transfer of electrons and holes to the Tb³⁺,while EL is mainly due to carrier trapping.更多还原