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Circularly polarized luminescence (CPL) materials with simultaneous high dissymmetry factor (glum) and brightness are pivotal for advanced photonic applications but remain challenging due to inherent trade-offs betwwen glum value and photoluminescenc quantum yield (PLQY). Here, we report a supramolecular engineering strategy to construct intrinsically luminescent chiral nematic liquid crystal (N*-LC) films via coassembly of luminescent liquid crystals (LLCs) and chiral dopant. First, five intrinsic LLCs molecules (2PFQ, 2PFBQ, 2PFB, 2PFSe, and 2PFS) were synthesized by combining the biphenyl framework with dioctyl-functionalized fluorene, achieving exceptional nematic phases and high brightness with PLQY up to 99%. Then, chiral coassembly of the obtained LLCs with chiral dopants (P/M-THH) followed by rapid thermal quenching yielded Bragg reflection-free N*-LC films exhibiting high-brightness CPL with recorded glum values (up to 0.75) and PLQY (up to 71%). Full-color tunability and white CPL (CIE: 0.33, 0.33) were realized through precise compositional control. The simultaneous optimization of glum and PLQY enables high-brightness CPL with advanced anticounterfeiting capabilities, opening new avenues for developing high-brighness CPL materials for polarized photonic and optoelectronic applications.
Yu et al. (Fri,) studied this question.