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Updated: May 15, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
Hierarchical Chirality Transfer and Amplification within Conjugated Helical Polymers for Efficient Circularly
Na Wang1, Hai Zhong1, Min Duan1
1State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Abstract:
Circularly polarized organic light-emitting diodes (CP-OLEDs) and CP photodetectors have received enormous attention owing to their promising potential in CP light-related technologies. The simultaneous construction of efficient CP-OLEDs and CP photodetectors using the multifunctionality of the same chiral material remains to be explored. Herein, achiral conjugated polymer poly(9,9-dioctylfluorene) (PFO) is used for coassembly with chiral helical polyacetylenes. The resulting chiral emitters can achieve high-performance circularly polarized electroluminescence (CPEL) with a large electroluminescence dissymmetry factor (gEL) of 0.11 and a high brightness of 9035 cd m-2. By introducing a flexible substrate into the device, flexible CP-OLEDs are realized. Additionally, such chiral emitters can serve as the photoactive layer of a CP photodetector to detect CP light, with a maximum photocurrent dissymmetry factor (gph) of the order of 10-1. This work provides a promising route to realize CP-OLEDs and CP photodetectors with large dissymmetry factors using polyfluorene and chiral polymer, facilitating their comprehensive and versatile development.
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