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Charge Separation-Induced Multicolor Circularly Polarized Long-Persistent Luminescence in Chiral Liquid Crystal

Mengdie Zhou1, Xin Ma1, Yang Wang1

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Summary

Researchers developed new circularly polarized organic long-persistent luminescence (CP-OLPL) materials. These advanced chiral materials offer tunable colors and enhanced optical activity for photonic applications.

Keywords:
charge-separated statechiral liquid crystal polymercircularly polarized luminescencelong-range charge transferorganic long-persistent luminescence

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photonics

Background:

  • Circularly polarized organic long-persistent luminescence (CP-OLPL) materials combine sustained afterglow with chiral optical activity.
  • Current CP-OLPL materials face limitations in color tunability, luminescence dissymmetry, and chiro-optical control.
  • Applications in temporal resolution, information encoding, and multifunctional photonic platforms are hindered by these limitations.

Purpose of the Study:

  • To develop a versatile strategy for creating CP-OLPL materials with improved performance.
  • To achieve tunable emission colors and enhanced chiro-optical properties.
  • To explore the potential of these materials in cryptography and data security.

Main Methods:

  • Synthesized chiral polymer matrices via copolymerization of cholesterol and cyanobiphenyl mesogens.
  • Incorporated fluorescent electron-donor molecules to generate charge-separated states via long-range charge transfer.
  • Tuned emission color and CPL performance by adjusting dopant type and concentration.

Main Results:

  • Achieved tunable emission colors from green to red with luminescence lifetimes up to 499.8 ms and afterglow up to 6.0 s.
  • Enhanced CPL performance by matching the selective reflection of the chiral matrix with the emission band.
  • Observed a maximum luminescence dissymmetry (g_lum) of -1.01 in the PBiCN-60@RhB 1.0% sample.
  • Demonstrated potential applications in cryptography and data security.

Conclusions:

  • A novel strategy combining charge-separated states and helical self-assembly of chiral liquid crystals was successfully implemented.
  • The developed CP-OLPL materials exhibit significant improvements in color tunability, luminescence lifetime, and CPL performance.
  • These materials hold promise for advanced photonic applications, including secure information encoding.