Emission characteristics of Tb(o-MBA)₃phen doped in PVK system

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• 作者：Yuanyuan Zhang ; Zhenbo Deng ; Ruifenb Wang
• 关键词：Tb complex ; Electroluminescence (EL) ; Exciton
• 刊名：Journal of Luminescence
• 出版年：2007
• 出版时间：January-April 2007
• 年：2007
• 卷：122-123
• 期：Complete
• 页码：690-692
• 全文大小：205 K

文摘

A rare-earth complex Tb (o-MBA)₃phen has been synthesized and used as an emitting material in electroluminescence. By doping it into the conjugated polymer PVK, devices with different structures were fabricated: Device A: Glass/ITO/PVK: Tb(o-MBA)₃phen /LiF/Al; Device B: Glass/ITO/PVK: Tb(o-MBA)₃phen/AlQ/LiF/Al; Device C: Glass/ITO/PVK: Tb(o-MBA)₃phen/BCP/AlQ/LiF/Al. The characteristics of these devices were investigated. For single-layer and double-layer devices, the emission of PVK was completely restrained, and only the green emission from Tb³⁺ can be observed in electroluminescence. It is because of the different mechanism of electroluminescence and photoluminescence. In photoluminescence process, the energy of Tb complex may come from PVK through Förster energy transfer process, and in electroluminescence process direct sequential charge trapping appeared to be the main operating mechanism. From the optimized device B, bright green emission can be obtained, and the highest EL brightness of the device reached 180 cd/m² at 15 V.