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Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
Published on: November 15, 2016
Assembly-Independent Intramolecular Chiroptical Amplification in Figure-Eight-Shape Multi-Resonance Emitters:
Shanshan Qi1, Nengquan Li1, Le Zhang1
1Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, P. R. China.
Abstract:
Incorporating chirality into multi-resonance (MR) frameworks offers an attractive route to narrowband circularly polarized luminophores, yet chiroptical amplification is constrained by decoupling between chiral perturbation and MR-confined radiative transitions. Self-assembly amplifies chirality through helically coupled emissive dipoles, but its morphology-dependent order conflicts with efficient electroluminescence. Here, we establish a self-assembly-independent intramolecular amplification strategy based on a C2-symmetric figure-eight macrocyclic MR architecture. Theoretical calculations reveal that transition-symmetry control and through-space interchromophoric coupling strengthen intramolecular chiral exciton interactions while preserving intrinsic MR emission. TmCz-[10]AD integrates narrowband emission, fast reverse intersystem crossing of 2.31 × 105 s-1, high photoluminescence quantum yield and a dissymmetry factor (|gPL|) approaching 10-2, enabling solution-processed organic electroluminescent (EL) device with a maximum external quantum efficiency exceeding 20.5% and an |gEL| value of 6.2 × 10-3.
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