FRET endows rare earth Eu(Ⅲ) complex with stable ultra-dissymmetry and narrowband circularly polarized luminescence  

Foster共振能量转移诱导稀土铕化合物稳定发射超不对称、窄带圆偏振光

作　　者：Yiran Ren Zhi Chen Honglong Hu Zixuan Zhang Bo Yang Zhigang Zheng Zhen-Qiang Yu Xiaopeng Li Wei-Hong Zhu Yue Wu 任懿冉;陈智;胡宏龙;张梓璇;杨波;郑致刚;余振强;李霄鹏;朱为宏;吴玥

机构地区：[1]College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518071,China [2]Shanghai Key Laboratory of Functional Materials Chemistry,Key Laboratory for Advanced Materials and Institute of Fine Chemicals,School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China [3]School of Physics,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Science China Materials》2025年第3期879-887,共9页中国科学(材料科学)(英文版)

基　　金：supported by the National Natural Science Foundation of China(92356301);the Innovation Research Foundation of Shenzhen(20231120172320001 and JCYJ20220818095807016);Shanghai Municipal Science and Technology Major Project(2018SHZDZX03).

摘　　要：Narrowband circularly polarized luminescence(CPL)is a crucial parameter for high color purity display but rarely studied.However,it is rather challenging and significant to provide a route towards high-dissymmetry CPL with both persistent chiroptical stability and narrowband emission.Despite possessing a very narrowband emission and excitation from the unique f-f transition of electrons,the chiral rare earth complexes often racemize with the low inversion barrier,resulting in an undesirable decrease of CPL signal.Herein,we report a circularly polarized Foster resonance energy transfer(C-FRET)in a liquid crystal(LC)coassembly that contains axially chiral alkoxy binaphthyl(R/S-BN)as donor and narrowband emission-featured rare earth Eu(Ⅲ)complex(EuOL)as acceptor.These highly ordered helical superstructures enable achiral EuOL to emit ultra-dissymmetric CPL,accompanying with a high dissymmetry factor up to 1.44 from LC microcavity resonance.The EuOL@R/S-BN exhibits extremely CPL narrowband with full width at half maximum of 10.8 nm.Compared with the direct excitation,the specific C-FRET strategy in LC coassembly can indirectly emit the highly dissymmetric and narrowband CPL,and completely overcome the CPL weakness from the essential chiral racemization of rare earth Eu(Ⅲ)complexes.Such LC C-FRET strategy can guarantee the chiroptical stability,high dissymmetry and narrowband emission,which is anticipated to put forward a new route toward the further utilization of rare earth and advanced display technology.窄带圆偏振发光是实现高纯色度先进显示技术的关键指标,但研究报道较少.如何实现稳定、高不对称的窄带圆偏振发光极具挑战性,意义重大.稀土配合物独特的f-f轨道跃迁使其具有窄带发射的优点,然而其配位能垒低、手性易消旋的缺点导致其极易猝灭圆偏振发光.我们报道了一种基于液晶手性共组装的圆偏振Forster共振能量转移(C-FRET)体系,其中轴手性联奈(R/S-BN)作为给体,非手性稀土铕配合物(EuOL)作为受体.该液晶手性共组装成功诱导非手性EuOL发射超不对称圆偏振光,通过液晶微腔共振放大手性,发光不对称因子高达1.44,半峰宽仅10.8 nm.与直接激发相比,通过手性液晶共组装CFRET策略间接激发稀土化合物实现高度不对称的窄带圆偏振发光,完全克服了稀土配合物手性易消旋的缺陷,为进一步开发利用稀土资源、实现先进光学显示技术提供了新思路.

关 键 词：circularly polarized luminescence FRET liquid crystal NARROWBAND rare earth luminescence 

分 类 号：O62[理学—有机化学]