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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Performance of Inverted Quantum Dot Light-Emitting Diodes Enhanced by Using Phosphorescent Molecules as Exciton Harvesters
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Performance of Inverted Quantum Dot Light-Emitting Diodes Enhanced by Using Phosphorescent Molecules as Exciton Harvesters

机译:磷光分子作为激子收集器增强了倒置量子点发光二极管的性能

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摘要

Exciton harvesters based on blue phosphorescent molecules bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium (FIrpic) doped in 4,4',4 ''-tris(carbazol-9-yl)triphenylamine (TCTA) are used to enhance the performance of inverted quantum dot light-emitting diodes (QD-LEDs). In the proposed device structures, electrons that leak to the TCTA layer can be effectively captured by FIrpic and subsequently can recombine in the TCTA:FIrpic layer. The harvested energy is then nonradiatively transferred to the adjacent QDs via Forster dipole-dipole coupling mechanism. Because of effective harvest of leaked electrons and complete energy transfer from FIrpic to the adjacent QDs, the demonstrated QD-LEDs exhibit pure QD emission, higher efficiency (1.62-fold improvement), and longer lifetime.
机译:基于蓝色磷光分子bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium(FIrpic)掺杂在4,4',4''-三(咔唑-9-基)三苯胺(TCTA)中的激子收集器倒置量子点发光二极管(QD-LED)的性能。在提出的器件结构中,泄漏到TCTA层的电子可以被FIrpic有效地捕获,然后可以在TCTA:FIrpic层中重新结合。然后,所收集的能量通过福斯特偶极子-偶极子耦合机制非辐射地转移到相邻的量子点。由于有效收集了泄漏的电子并完成了从FIrpic到相邻QD的完全能量转移,因此,已证明的QD-LED具有纯QD发射,更高的效率(提高1.62倍)和更长的使用寿命。

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