Hierarchical Chirality Transfer and Amplification within Conjugated Helical Polymers for Efficient Circularly Polarized Organic Light-Emitting Diodes and Photodetectors

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 (<i>g</i>_EL) 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 (<i>g</i>_ph) 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.