Inverted and Amplified CP-EL Behavior Promoted by AIE-Active Chiral Co-Assembled Helical Nanofibers.
basic_science · Level V
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- Also identified by DOI 10.1002/adma.202209495.
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Abstract
It is well-known that high-performance circularly polarized organic light-emitting diodes (CP-OLEDs) remain a formidable challenge to the future application of circularly polarized luminescent (CPL)-active materials. Herein, the design of a pair of AIE-active chiral enantiomers (L/D-HP) is described to construct chiral co-assemblies with an achiral naphthalimide dye (NTi). The resulting co-assemblies emit an inverted CPL signal compared with that from the L/D-HP enantiomers. After thermal annealing at 120 °C, the inverted CPL signal of this kind of L/D-HP-NTi with a 1:1 molar ratio shows regular and ordered helical nanofibers arranged through intermolecularly ordered layered packing and is accompanied with a further amplified effect (|g<sub>em</sub> | = 0.032, λ<sub>em</sub> = 535 nm). Significantly, non-doped CP-OLEDs based on a device emitting layer (EML) of L/D-HP-NTi exhibits a low turn-on voltage (V<sub>on</sub> ) of 4.7 V, a high maximum brightness (L<sub>max</sub> ) of 2001 cd m<sup>-2</sup> , and moderate maximum external quantum efficiency (EQE<sub>max</sub> ) of 2.3%, as well as excellent circularly polarized electroluminescence (CP-EL) (|g<sub>EL</sub> | = 0.023, λ<sub>em</sub> = 533 nm).