Induction of Circularly Polarized Electroluminescence from Achiral Poly(fluorene-alt-benzothiadiazole) via Circularly Polarized Light
Circularly polarized luminescence is rising to be the cynosure of a range of display and photonic technologies, including backlights, optical spintronics, and quantum information processing. Conventional strategies to direct emit circularly polarized electroluminescence from the emissive layer (EML) of the organic light-emitting diodes (OLEDs), including the attachment of chiral pendants and the doping of chiral additives, are well developed. Herein, we demonstrated that the OLEDs basing on achiral poly(9,9-di-n-hexylfluorene-alt-benzothiadiazole) (F6BT) could be induced to directly give a preferential emission of left- or right-handed circularly polarized electroluminescence only by the simple treatment of circularly polarized light. The screw sense in F6BT could be easily controlled, and exhibited strong dependence not only on the handedness but also on the wavelength of the driving circularly polarized light. This study sheds light on a unique design to realize circularly polarized electroluminescence with achiral compounds and pave the way for the fabrication of large-area and high-quality chiral optoelectronic devices.