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.
Key Lab of Environment‐friendly Chemistry and Circularly polarized luminescent (CPL) materials with multitudinous inherent advantages shows extensive application. In this work, we prepare a kind of highly efficient wavelength‐tunable CPL free‐standing films by responsive chiral aggregation‐induced emission mesogen. Firstly, the pyridine‐functionalized tetraphenylethene monomer (MPy) is designed and synthesized. Then, the different ration of the monomer MPy mixed with the liquid crystal (LC) reactive monomer (LC242) to fabricate a free‐standing film by photopolymerization. The obtained film presents efficient CPL with a constant luminescence asymmetry factor (glum) of +0.75, as well as sensitive wavelength tunability. Finally, this wavelength‐tunable CPL film with both fluorescence and CPL modes is successfully applied in anti‐counterfeiting and information encryption. This work provides a simple way to construct CPL apparatus with adjustable luminescence wavelength and high glum.
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