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首页> 外文期刊>Advanced Functional Materials >Energy Landscape of Vertically Anisotropic Polymer Blend Films toward Highly Efficient Polymer Light-Emitting Diodes (PLEDs)
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Energy Landscape of Vertically Anisotropic Polymer Blend Films toward Highly Efficient Polymer Light-Emitting Diodes (PLEDs)

机译：垂直各向异性聚合物共混膜向高效聚合物发光二极管（PLED）的能量分布

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摘要

A blend of two hole-dominant polymers is created and used as the light emissive layer in light-emitting diodes to achieve high luminous efficiency up to 22 cd A(-1). The polymer blend F8(1-x)SY(x) is based on poly(9,9-dioctylfluorene) (F8) and poly(para-phenylene vinylene) derivative superyellow (SY). The blend system exhibits a preferential vertical concentration distribution. The resulting energy landscape modifies the overall charge transport behavior of the blend emissive layer. The large difference between the highest unoccupied molecular orbital levels of F8 (5.8 eV) and SY (5.3 eV) introduces hole traps at SY sites within the F8 polymer matrix. This slows down the hole mobility and facilitates a balance between the transport behavior of both the charge carriers. The balance due to such energy landscape facilitates efficient formation of excitons within the emission zone well away from the cathode and minimizes the surface quenching effects. By bringing the light-emission zone in the middle of the F8(1-x)SY(x) film, the bulk of the film is exploited for the light emission. Due to the charge trapping nature of SY molecules in F8 matrix and pushing the emission zone in the center, the radiative recombination rate also increases, resulting in excellent device performance.
机译：创建了两种空穴占优势的聚合物的混合物，并将其用作发光二极管中的发光层，以实现高达22 cd A（-1）的高发光效率。聚合物共混物F8（1-x）SY（x）基于聚（9,9-二辛基芴）（F8）和聚（对亚苯基亚乙烯基）衍生物超黄（SY）。共混体系表现出优先的垂直浓度分布。产生的能量分布图修改了混合发射层的总体电荷传输行为。 F8（5.8 eV）和SY（5.3 eV）的最高未占用分子轨道水平之间的巨大差异在F8聚合物基质内的SY位点引入了空穴陷阱。这减慢了空穴迁移率并促进了两个电荷载流子的传输行为之间的平衡。由于这种能量分布而产生的平衡有利于在远离阴极的发射区内有效地形成激子，并使表面猝灭效应最小。通过使发光区位于F8（1-x）SY（x）膜的中间，该膜的大部分被用于发光。由于SY分子在F8基质中的电荷俘获性质并推动了中心的发射区，因此辐射复合率也提高了，从而获得了出色的器件性能。

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