Emission Characteristics of PVK Doped TbY(o-MBA)6(phen)2 Systems
来源期刊：JOURNAL OF RARE EARTHS2006年第2期
论文作者：Xu Denghui Liang Chunjun Zhang Yuanyuan Wang Ruifen Xiao Jing Deng Zhenbo Chen Baomei
Key words：terbium complex; electroluminescence (EL); exciton; rare earths;
Abstract: A rare earth complex TbY (o-MBA)6(phen)2 was synthesized, which was first used as an emitting material in electroluminescence.By doping it into the conjugated polymer PVK, single-layer and double-layer devices were fabricated with structures: device A: ITO/PVK: TbY (o-MBA)6(phen)2/LiF/Al;B: ITO/PVK: TbY (o-MBA)6(phen)2/AlQ/LiF/Al;C: ITO/PVK: TbY (o-MBA)6(phen)2/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+ was observed in electroluminescence.The above mentioned observation is attributed to the different mechanism of electroluminescence and photoluminescence.In photoluminescence process, the energy of Tb complex may come from PVK through Frster energy transfer process, while in electroluminescence process direct sequential charge trapping appeares to be the main operating mechanism.From the optimized device B, brightly green emission can be obtained, and the highest EL brightness of the device reaches 213 cd·m-2 at 14 V.
Xu Denghui1，Liang Chunjun1，Zhang Yuanyuan1，Wang Ruifen2，Xiao Jing1，Deng Zhenbo1，Chen Baomei1
(1.Institute of Optoelectronic Technology, Key Laboratory of Information Storage and Display, Beijing Jiaotong University, Beijing 100044, China;
2.Department of Chemistry, Hebei Normal University, Shijiazhuang 050091, China)
Abstract:A rare earth complex TbY (o-MBA)6(phen)2 was synthesized, which was first used as an emitting material in electroluminescence.By doping it into the conjugated polymer PVK, single-layer and double-layer devices were fabricated with structures: device A: ITO/PVK: TbY (o-MBA)6(phen)2/LiF/Al;B: ITO/PVK: TbY (o-MBA)6(phen)2/AlQ/LiF/Al;C: ITO/PVK: TbY (o-MBA)6(phen)2/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+ was observed in electroluminescence.The above mentioned observation is attributed to the different mechanism of electroluminescence and photoluminescence.In photoluminescence process, the energy of Tb complex may come from PVK through Frster energy transfer process, while in electroluminescence process direct sequential charge trapping appeares to be the main operating mechanism.From the optimized device B, brightly green emission can be obtained, and the highest EL brightness of the device reaches 213 cd·m-2 at 14 V.
Key words:terbium complex; electroluminescence (EL); exciton; rare earths;
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