Circularly polarized luminescent (CPL) materials have attracted many attentions due to their potential applications in 3D imaging, anti-counterfeiting, etc. However, it is still a great challenge to achieve circularly polarized...

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