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An Ionic Liquid That Dissolves Semiconducting Polymers: A Promising Electrolyte for Bright, Efficient, and Stable Light-Emitting Electrochemical Cells
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-06-30 00:00:00 , DOI: 10.1021/acs.chemmater.7b02128 Tomo Sakanoue 1 , Fumihiro Yonekawa 2 , Ken Albrecht 3, 4 , Kimihisa Yamamoto 3, 4 , Taishi Takenobu 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-06-30 00:00:00 , DOI: 10.1021/acs.chemmater.7b02128 Tomo Sakanoue 1 , Fumihiro Yonekawa 2 , Ken Albrecht 3, 4 , Kimihisa Yamamoto 3, 4 , Taishi Takenobu 1
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Light-emitting electrochemical cells (LECs) are composed of blends of semiconducting polymers and electrolytes, in which a unique cooperative action of ions and electrons induces a dynamic p–n junction for efficient emission. One of the crucial issues remaining in LECs is uniformity in blends of polymer and electrolyte; phase separation in between the two components results in poor performance or failure of operation. Here, we overcome this issue by developing an ionic liquid-based electrolyte of alkylphosphonium-phosphate that shows notable compatibility high enough to dissolve even light-emitting polymers. This exceptional compatibility enabled us to prepare uniform film blends with various blue to red emitting polymers, and offered bright and efficient LECs. Especially, a blue-emitting LEC showed excellent performance: the luminance reached ∼20 000 cd m–2 with a high luminance efficiency of ∼5 cd A–1, of which performances significantly exceed a light-emitting diode using the same polymer. The ionic liquid was further applied to the LECs with state-of-the-art light-emitting dendrimers showing thermally activated delayed fluorescence under electrical excitation, giving a high efficiency of 11 cd A–1. These demonstrations remind us of the great importance of the polymer–electrolyte compatibility and the usefulness of ILs for electrolyte of LECs.
中文翻译：
溶解半导体聚合物的离子液体：明亮，高效且稳定的发光电化学电池的理想电解质
发光电化学电池（LEC）由半导体聚合物和电解质的混合物组成，其中离子和电子的独特协同作用诱导了动态的p-n结，从而实现了有效的发射。LEC中剩余的关键问题之一是聚合物和电解质混合物的均匀性。两个组件之间的相分离会导致性能不佳或运行失败。在这里，我们通过开发烷基磷酸on的离子液体电解质解决了这个问题，该电解质显示出足够高的相容性，甚至可以溶解发光聚合物。这种出色的兼容性使我们能够制备出具有各种蓝色至红色发光聚合物的均匀薄膜共混物，并提供了明亮高效的LEC。尤其是，发蓝光的LEC表现出出色的性能：–2的发光效率高达〜5 cd A –1，其性能大大超过使用相同聚合物的发光二极管。离子液体通过最先进的发光树状大分子进一步应用于LEC，在电激发下显示出热激活的延迟荧光，提供11 cd A –1的高效率。这些演示使我们想起了聚合物与电解质相容性的重要性，以及IL对LEC电解质的有用性。
更新日期：2017-07-02
中文翻译：
溶解半导体聚合物的离子液体：明亮，高效且稳定的发光电化学电池的理想电解质
发光电化学电池（LEC）由半导体聚合物和电解质的混合物组成，其中离子和电子的独特协同作用诱导了动态的p-n结，从而实现了有效的发射。LEC中剩余的关键问题之一是聚合物和电解质混合物的均匀性。两个组件之间的相分离会导致性能不佳或运行失败。在这里，我们通过开发烷基磷酸on的离子液体电解质解决了这个问题，该电解质显示出足够高的相容性，甚至可以溶解发光聚合物。这种出色的兼容性使我们能够制备出具有各种蓝色至红色发光聚合物的均匀薄膜共混物，并提供了明亮高效的LEC。尤其是，发蓝光的LEC表现出出色的性能：–2的发光效率高达〜5 cd A –1，其性能大大超过使用相同聚合物的发光二极管。离子液体通过最先进的发光树状大分子进一步应用于LEC，在电激发下显示出热激活的延迟荧光，提供11 cd A –1的高效率。这些演示使我们想起了聚合物与电解质相容性的重要性，以及IL对LEC电解质的有用性。
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