Through-Space Charge Transfer Polynorbornenes with Fixed and Controllable Spatial Alignment of Donor and Acceptor for High-Efficiency Blue Thermally Activated Delayed Fluorescence

Angewandte Chemie
Qiang LiFosong Wang

Abstract

Through-space charge transfer polynorbornenes with fixed and controllable spatial alignment of donor and acceptor in edge-to-face/face-to-face stacking patterns are developed for achieving high-efficiency blue thermally activated delayed fluorescence (TADF). The alignment is realized by two aspects of molecular engineering on stereo-configuration of polymer skeleton and topological architecture of donor, including (i) using cis, exo-configuration of norbornene to confine donor and acceptor in close proximity with distance of 3.52∼3.90 Å, and (ii) utilizing orthogonal and dendritic structures of donors to provide either perpendicular or parallel stacking motif relative to acceptors. Compared to edge-to-face counterparts, polynorbornenes with face-to-face aligned donor and acceptor exhibit much larger oscillator strength and higher photoluminescence quantum yield up to 81% in neat film owing to the enforced cofacial π-π interactions. The resulting polymers exhibit deep blue (422 nm) to sky blue (482 nm) emission and TADF effect with reverse intersystem crossing rates of 0.4∼5.9×10 6 s -1 , giving the maximum external quantum efficiency of 18.8% for non-doped blue organic light-emitting diodes by solution process, which represents...Continue Reading

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Citations

Apr 16, 2021·The Journal of Physical Chemistry Letters·Huiting ZhouGuozhen Zhang
Apr 20, 2021·Journal of Chemical Information and Modeling·Antonina L NazarovaPankaj Rajak
May 5, 2021·Angewandte Chemie·Xingdong WangFosong Wang

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