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Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

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Abstract

We report two donor–acceptor (D–A) materials based on a cyanoanthracene acceptor paired with diphenylamine (DPAAnCN) and carbazole (CzAnCN) donor moieties. These compounds show hybrid locally excited (LE) charge-transfer (CT) excited states (HLCT), which we demonstrated through a combined photophysical and computational study. Vacuum-deposited organic light emitting diodes (OLEDs) using these HLCT emitters exhibit maximum external quantum efficiencies (EQEmax) close to 6%, with impressive exciton utilization efficiency (Φs) of >50%, far exceeding the spin statistic limit of 25%. We rule out triplet–triplet annihilation and thermally activated delayed fluorescence as triplet harvesting mechanisms along with horizontal orientation of emitters to enhance light outcoupling and, instead, propose a “hot exciton” channel involving the nearly isoenergetic T2 and S1 states.

Graphical abstract: Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

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Article information


Submitted
19 Nov 2019
Accepted
27 Jan 2020
First published
28 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Exciton efficiency beyond the spin statistical limit in organic light emitting diodes based on anthracene derivatives

N. Sharma, M. Y. Wong, D. Hall, E. Spuling, F. Tenopala-Carmona, A. Privitera, G. Copley, D. B. Cordes, A. M. Z. Slawin, C. Murawski, M. C. Gather, D. Beljonne, Y. Olivier, I. D. W. Samuel and E. Zysman-Colman, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06356K

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