Highly Linearized Twisted Iridium(III) Complexes
Highly Linearized Twisted Iridium(III) Complexes
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DOI：
10.1021/acs.inorgchem.8b02818
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发表时间：
2018-11-19
影响因子：
4.6
通讯作者：
Beeby, Andrew
中科院分区：
文献类型：
--
作者：
Davidson, Ross;Hsu, Yu-Ting;Beeby, Andrew
改善发射分子的空间排列长期以来一直是有机发光二极管开发的目标，以改善器件效率并产生偏振发射。本文中，我们描述了一种简单的方法，采用Sonogashira偶联与炔铱-（苯基吡啶）2（乙酰丙酮）双离子（2-5），以产生八个线性铱配合物（6-13），其晶体学确定的长度高达5 nm。通过将这些“长”复合物嵌入聚合物基质中并对其进行拉伸，实现了未拉伸和拉伸膜的偏振比的高达7.1倍的改善。此外，通过在配合物中引入“扭曲”，铱中心和取代基之间的电子耦合被控制，得到其中发射行为与长度无关的系统。
Improving the spatial alignment of emitting molecules has long been a goal of organic-light-emitting-diode development to improve device efficiencies and to generate polarized emission. Herein we describe a simple approach employing Sonogashira coupling with alkyne iridium-(phenylpyridine)2(acetylacetone) synthons (2-5) to generate eight linear iridium complexes (6-13) with crystallographically determined lengths of up to 5 nm. By embedding these "long" complexes into a polymer matrix and stretching it, an improvement of the polarization ratio of unstretched and stretched films of up to 7.1 times was achieved. Additionally, through the inclusion of "twists" in the complexes, the electronic coupling between the iridium center and substituent was controlled, giving a system where the emission behavior is independent of the length.