Boosting Circularly Polarized Luminescence Performance by a Double π-Helix and Heteroannulation

• DOI: 10.1021/jacs.2c04012
• Publication Date: 2022-06-18T01:29:01Z
• Authors: Yujian Liu; Zetong Ma; Zhaohui Wang; Wei Jiang
• Keywords: Boosting; Helix (gastropod)

Design challenges in the development of circularly polarized luminescence (CPL) materials are focused on balancing dissymmetry factor (glum) and photoluminescence quantum yield (ΦPL) by regulating electric (μ) magnetic (m) transition dipole moment vectors. Aiming at designing efficient CPL emitters clarifying chiroptical variation mechanism, herein, we present a double π-helix based cyclooctatetraene-embedded perylene diimide dimer that combines chirality with molecular entanglement very high barriers for racemization. Through finely magnitudes μ m, maximal factors |gabs| |glum| can be boosted to 0.035 0.030, respectively, as revealed circular dichroism (CD) spectra. The results indicate 3-fold improvement g values modulated ΦPL from 1a, 4, 5 nitrogen heteroannulation bay region. brightness (BCPL) reaches recorded value up 573.4 M–1 cm–1, among highest chiral small molecules reported so far. This work has provided comprehensive insight into new class activities, further laying fundamentals optoelectronics.