Tb(p-MBA)3phen与PVK混合体系发光性质研究  

Emission Characteristics of Tb(p-MBA)_3phen Doped in PVK System

作　　者：徐颖[1] 邓振波[1] 徐登辉[1] 肖静[1] 王瑞芬[2] 

机构地区：[1]北京交通大学光电子技术研究所信息存储,显示与材料开放实验室,北京100044 [2]河北师范大学化学系,河北石家庄050091

出　　处：《光电子．激光》2005年第3期319-322,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(90201004);北京市科委资助项目(H030430020410)

摘　　要：研究了铽配合物Tb(p MBA)3phen与聚乙烯咔唑 PVK共掺杂体系的电致发光(EL)和光致发光(PL)特性。结果发现,在EL中,PVK的发光完全被抑制,只能看到明显的Tb3+绿光发射;而在 PL中,除了Tb3+发光外,还可以看到明显的PVK发光。这是由于两种发光机理不同造成的。通过测量材料的发射光谱和激发光谱,初步探讨了器件的发光机理,认为 Tb3+ 的发光可能来源于 2 个方面:1) PVK到稀土配合物的F¨orester能量传递;2) PVK作为一种空穴传输材料,而稀土配合物作为电子陷阱,受激的空穴和电子直接被稀土配合物俘获,在稀土配合物上形成激子复合发光。所制作的单层器件的最大亮度达24.8 cd/m2。A new rare earth complex Tb(p-MBA)3phen has been synthesized, and the electroluminescence (EL) and photoluminescence (PL) characteristics of the Terbium complex and PVK system were investigated. In the EL spectra, the emission of PVK is completely restrained, and only the green emission come from Tb3+ can be observed; while in the PL spectra, obvious emission of PVK can be seen besides the emission of Tb3+. It is because of the different mechanism of electroluminescence and photoluminescence. The luminescent characteristics of the device were preliminarily discussed by measuring and analyzing the emission and the excitation spectra of the Tb complex and the mixture of the Tb complex dispersed in PVK film. Two mechanisms of the emission were proposed. The energy of Tb complex may partly come from PVK through Forester energy transfer process, and another possibility is the electrons and holes may be captured by Tb complex directly.

关 键 词：电致发光 能量传递 电子陷阱 激子 PVK混合体系 发光性质 铽配合物 

分 类 号：O641.4[理学—物理化学] O482.31[理学—化学]