Wade Jessica, Brandt Jochen R, Reger David, Zinna Francesco, Amsharov Konstantin Y, Jux Norbert, Andrews David L, Fuchter Matthew J
Department of Chemistry and Molecular Sciences Research Hub, Imperial College London, White City Campus, 82 Wood Lane, London, W12 0BZ, UK.
Institute for Molecular Science and Engineering and Centre for Processable Electronics, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK.
Angew Chem Int Ed Engl. 2021 Jan 4;60(1):222-227. doi: 10.1002/anie.202011745. Epub 2020 Dec 1.
Strongly dissymmetric circularly polarised (CP) luminescence from small organic molecules could transform a range of technologies, such as display devices. However, highly dissymmetric emission is usually not possible with small organic molecules, which typically give dissymmetric factors of photoluminescence (g ) less than 10 . Here we describe an almost 10 -fold chiroptical amplification of a π-extended superhelicene when embedded in an achiral conjugated polymer matrix. This combination increases the |g | of the superhelicene from approximately 3×10 in solution to 0.15 in a blend film in the solid-state. We propose that the amplification arises not simply through a chiral environment effect, but instead due to electrodynamic coupling between the electric and magnetic transition dipoles of the polymer donor and superhelicene acceptor, and subsequent CP Förster resonance energy transfer. We show that this amplification effect holds across several achiral polymer hosts and thus represents a simple and versatile approach to enhance the g-factors of small organic molecules.
来自小分子的强不对称圆偏振（CP）发光可以变革一系列技术，如显示设备。然而，小分子通常无法实现高度不对称发射，其光致发光的不对称因子（g）通常小于10。在此，我们描述了一种π-扩展超螺旋烯嵌入非手性共轭聚合物基质时近10倍的手性光学放大。这种组合使超螺旋烯的|g|从溶液中的约3×10增加到固态共混膜中的0.15。我们认为，这种放大不仅仅是通过手性环境效应产生的，而是由于聚合物供体和超螺旋烯受体的电偶极矩和磁偶极矩之间的电动力学耦合，以及随后的CP福斯特共振能量转移。我们表明，这种放大效应在几种非手性聚合物主体中都成立，因此代表了一种增强小分子g因子的简单通用方法。
