Regulating Circularly Polarized Luminescent Behavior of Luminescent Liquid Crystalline Polymers through Resonance Energy Transfer

• DOI: 10.1021/acs.macromol.3c00002
• Publication Date: 2023-03-21T15:58:05Z
• Authors: Zhi-Wang Luo; Ao Huang; Hui-Ying Luo; Jin-Kang Chen; Jiang Huang; He-Lou Xie
• Keywords: Nile red

Circularly polarized luminescent materials show significant application in display devices, optical instruments, bionic fields, etc. In this work, we design and prepare a chiral liquid crystalline polymer, namely, poly(4,4',4″-tricholesterylformate-oxytetraphenylethylene-methyl acrylic acid ester) (P1). Polarizing microscopy (POM) X-ray diffraction (XRD) results indicate that polymer forms hexagonal columnar phase. luminescence (CPL) experiment shows no CPL signal is observed for the bulk, but mixed with small amount of 4-cyano-4′-pentylbiphenyl (5CB) (P1@5CB) presents strong asymmetry factor (glum) +0.18. Further, Förster resonance energy transfer (FRET) adopted to regulate using P1 as energy/chiral donors achiral long-wavelength Nile red (NR) dyes acceptors. The resultant compound bathochromically shifted emission by up 160 nm compared P1@5CB also emits an efficient glum +0.20. This result demonstrates controllable regulation realized through nonradiative transfer.