Ultrastrong Red Circularly Polarized Luminescence Promoted from Chiral Transfer and Intermolecular Förster Resonance Energy Transfer in Ternary Chiral Emissive Nematic Liquid Crystals

• Published in: The journal of physical chemistry letters Vol. 12; no. 1; pp. 598 - 603
• Main Authors: Yao, Kun, Shen, Yihao, Li, Yang, Li, Xiaojing, Quan, Yiwu, Cheng, Yixiang
• Format: Journal Article
• Language: English
• Published: United States 14.01.2021
• ISSN: 1948-7185; 1948-7185
• DOI: 10.1021/acs.jpclett.0c03438

Chiral emissive liquid crystals (N*-LCs) have been proved to greatly amplify the circularly polarized luminescence (CPL) signals due to highly regular spiral arrangement of dyes in a well-organized liquid crystals system. Normally, CPL materials with a high luminescence dissymmetry factor ( ) and quantum yield (QY) can meet the real application requirement. Here, four chiral aggregate-induced emission (AIE) active donors (Guests A1-A4: -C2, -C4, -C6, -C8, chiral dopant, and energy donor) and achiral AIE-active acceptors (Guest B: PBCy, CPL emitter) were doped into the commercial nematic liquid crystals E7 (N-LCs, Host) to form CPL-active ternary chiral emissive N-LCs (T-N*-LCs), respectively. This kind of T-N*-LCs could emit strong red CPL with QY = 16.56% and up to 1.51 through intermolecular energy transfer and chirality induction from the supramolecular self-assembly of T-N*-LCs. This work provides the effective strategy for the development of high CPL materials.