发光
化学
圆二色性
外消旋化
手性(物理)
二聚体
光致发光
圆极化
发色团
结晶学
分子
跃迁偶极矩
立体化学
光化学
光电子学
光学
物理
有机化学
对称性破坏
手征对称破缺
量子力学
微带线
Nambu–Jona Lasinio模型
作者
Yujian Liu,Zetong Ma,Zhaohui Wang,Wei Jiang
摘要
Design challenges in the development of circularly polarized luminescence (CPL) materials are focused on balancing the luminescence dissymmetry factor (glum) and photoluminescence quantum yield (ΦPL) by regulating the electric (μ) and magnetic (m) transition dipole moment vectors. Aiming at designing efficient CPL emitters and clarifying the chiroptical variation mechanism, herein, we present a double π-helix based on a cyclooctatetraene-embedded perylene diimide dimer that combines chirality with molecular entanglement and very high barriers for racemization. Through finely regulating the magnitudes of μ and m, the maximal dissymmetry factors |gabs| and |glum| can be boosted to 0.035 and 0.030, respectively, as revealed by circular dichroism (CD) and CPL spectra. The results indicate a 3-fold improvement of g values and a modulated ΦPL from 1a, 4, to 5 by nitrogen heteroannulation at the bay region. The CPL brightness (BCPL) of 5 reaches a recorded value of up to 573.4 M-1 cm-1, among the highest values of chiral small molecules reported so far. This work has provided a comprehensive insight into a new class of chiral materials with high CPL activities, further laying molecular fundamentals for chiral optoelectronics.
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