【作者】 郝兴天； 彭海炎； 解孝林；

【Author】 Xingtian Hao;Haiyan Peng;Xiaolin Xie;Key Lab for Material Chemistry of Energy Conversion and Storage,Ministry of Education,Huazhong University of Science and Technology (HUST);National Anti-Counterfeit Engineering Research Center,HUST;

【机构】 华中科技大学化学与化工学院能量转换与存储材料化学教育部重点实验室； 国家防伪工程技术研究中心；

【摘要】 发光液晶具有优异的光学各向异性、流动性和发光特性,在液晶显示、有机发光二极管、光信息存储等领域具有广泛的应用前景[1-2]。其中,发光性能的提升与调控是一大挑战。过渡金属配合物在激发光作用下,可通过自旋禁阻弛豫,表现出异于传统有机发光材料的光化学/物理性质。通过改变这类配合物的中心金属原子和配体取代基,可实现电子结构与氧化还原性能的有效调控,进而获得在整个可见光范围内连续可调的发光光谱[3]。过渡金属配合物较好的平面结构有利于分子间的相互堆叠,辅以适当的柔性侧链,可获得液晶态有序结构。研究结果表明,这类发光液晶具有六方柱状相结构,可发射中心波长为565 nm的荧光,且表现出聚集诱导发光特性和可逆力致发光变色行为。更多还原

【Abstract】 Luminescent liquid crystals, which hold outstanding optical anisotropy, fluidity and intrinsic photoluminescence characteristic, show a great potential to be widely applied in liquid crystal display, organic light-emitting diode, optical information storage, etc. Yet, it still remains a big challenge to enhance and tune the luminescent properties. Transition-metal complexes are able to relax from the excited state back to the ground state through spin-forbidden transitions, giving rise to distinct photochemical and photophysical features in comparison with traditional organic fluorophores. The metal center and coordinated ligands are ready to be adjusted, so that both the electronic and redox properties can be modulated, affording tunable luminescence colors across the whole visible spectrum regime. With proper flexible side chains, ordered liquid crystal structures can be formed because of the strong intermolecular interaction between the complex’s square-planar structure. Results show that our luminescent liquid crystal exhibits hexagonal columnar phase. Its maximum photoluminescence centers at 565 nm. More interestingly, it presents aggregation-induced emission characteristic and reversible mechanochromic behaviors.更多还原