Improving the Performance of Blue Polymer Light-Emitting Diodes Using a Hole Injection Layer with a High Work Function and Nanotexture.,ACS Applied Materials & Interfaces

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Improving the Performance of Blue Polymer Light-Emitting Diodes Using a Hole Injection Layer with a High Work Function and Nanotexture.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-23 , DOI: 10.1021/acsami.0c03821
Zhiming Zhong ₁ , Yawei Ma ₁ , Hongli Liu ₂ , Feng Peng ₁ , Lei Ying ₁ , Shirong Wang ₂ , Xianggao Li ₂ , Junbiao Peng ₁ , Yong Cao ₁

Affiliation

For light-emitting polymers with a deep highest occupied molecular orbital energy level used for polymer light-emitting diodes (PLEDs), the hole injection barrier and hole transport of the anode buffer layer are of vital importance for optimizing electroluminescent performance. In this study, high-work-function hole injection layers with nanotextures were achieved by modifying poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) with a perfluorinated ionomer (PFI) and n-butyl alcohol and were used to achieve a single-layer device without a hole transport layer. With such an interlayer, the PLEDs based on PPF-SO25 exhibit remarkable current efficiency over 13.0 cd A-1, which significantly outperform the devices with regular PEDOT:PSS. To our knowledge, this performance is among the best reported for single-layer blue PLEDs. The bias-dependent capacitance curves of these PLEDs suggest a nonuniform surface distribution of PFI. Our findings show that the PFI-modified PEDOT:PSS not only operates as a high-work-function hole injection layer to facilitate hole injection but also as a potential inner scattering medium for light extraction.

中文翻译：

使用具有高功函数和纳米结构的空穴注入层改善蓝色聚合物发光二极管的性能。

对于用于聚合物发光二极管（PLED）的具有最高的最高占据分子轨道能级的发光聚合物，空穴注入势垒和阳极缓冲层的空穴传输对于优化电致发光性能至关重要。在这项研究中，通过用全氟离聚物（PFI）和正丁醇改性聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐（PEDOT：PSS），获得了具有纳米结构的高功能空穴注入层，并用于实现没有空穴传输层的单层器件。有了这样的中间层，基于PPF-SO25的PLED在13.0 cd A-1以上的电流效率非常好，大大优于常规PEDOT：PSS的器件。据我们所知，该性能是单层蓝色PLED所报告的最好的性能之一。这些PLED的依赖于偏压的电容曲线表明PFI的表面分布不均匀。我们的发现表明，PFI改性的PEDOT：PSS不仅用作高功函数空穴注入层，以促进空穴注入，而且还可以作为潜在的内部散射介质进行光提取。

更新日期：2020-04-08

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