Broadband Reflective Cholesteric Liquid Crystals for Low-Blue Circularly Polarized Light Generation in the Visible Region.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41866762.
- Also identified by DOI 10.1002/adma.72890.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
In this work, a polymerizable chiral liquid-crystal monomer was first synthesized from inexpensive biomass-derived cholesterol through a simple transformation. Co-assembling this chiral monomer with a polymerizable achiral liquid-crystal monomer and followed by initiator-free photopolymerization, yielded a cholesteric liquid-crystal (CLC) material YMZ-5 featuring a broad reflection band in the visible region with blue-selectivity. After removal of the quartz substrates, the material forms a flexible film with good thermal stability. Due to Bragg reflection, under transmission mode, YMZ-5 efficiently converts 510-700 nm unpolarized light into right-handed circularly polarized (R-CP) light with dissymmetry factors (g<sub>lum</sub>) of -1.6 and even reaching up to -2.0. Placed behind achiral zero-blue aqueous solutions, YMZ-5 enabled multicolour zero-blue circularly polarized photoluminescence, generating exclusively R-CP light with |g<sub>lum</sub>| values exceeding 1.6. Additionally, under reflection mode, YMZ-5 efficiently converts unpolarized ambient light into 510-700 nm low-blue left-handed circularly polarized (L-CP) light. Therefore, YMZ-5 exhibited distinctly different colors under varying backgrounds and circular polarizers. Leveraging these behaviors, molecular logic gate and information encryption-decryption were realized. Furthermore, a conceptual design for a low-blue circularly polarized display device was also demonstrated.