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arXiv 1411.3166cond-mat.mtrl-sci
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侧基对染料分子掺杂多层有机电致发光器件中载流子迁移动力学的影响

Effects of Side Groups on Kinetics of Charge Carrier Recombination in Dye Molecule-Doped Multilayer Organic Light-Emitting Diodes

Shengwei Shi, Feng Gao, Zhengyi Sun, Yiqiang Zhan, Mats Fahlman, Dongge Ma

摘要:

采用瞬态电致发光(EL)方法研究了染料分子掺杂多层有机电致发光器件(OLED)中载流子复合的动力学。三组染料分子,如萘酰亚胺和二苯乙烯的衍生物,被用作发光层中的掺杂剂。虽然这些器件对每组分子显示出几乎相同的EL光谱,但它们显示出非常不同的EL效率。EL效率的差异归因于载流子复合的差异,如瞬态EL所揭示的。复合系数(γ)由关闭矩形电压脉冲后EL强度的时间衰减的长时间分量确定。结果表明,掺杂剂的分子结构对γ和EL效率有很大的影响,掺杂剂中的施主基团和π共轭结构保证了高的γ和EL效率。

英文摘要:

The kinetics of the charge carrier recombination in dye molecule-doped multilayer organic light-emitting diodes (OLEDs) was quantified by transient electroluminescence (EL). Three sets of dye molecules, such as derivatives of naphthalimide and stilbene, were used as dopants in light-emission layer. Although the devices show almost the same EL spectra for each set of molecules, they show very different EL efficiency. The difference in EL efficiency was attributed to the difference in charge carrier recombination, as revealed by transient EL. The recombination coefficient (γ) was determined from the long-time component of the temporal decay of the EL intensity after a rectangular voltage pulse was turned off. It was found that γ and EL efficiency were both strongly dependent on the molecular structures of the dopants, and the donor groups and π-conjugated structure guaranteed high γ and EL efficiency in OLEDs.

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