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Highly efficient red thermally activated delayed fluorescence materials based on a cyano-containing planar acceptor

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Abstract

Two highly emissive materials (W1 and W2) were designed and synthesized, where two ortho-triphenylamine (TPA) groups were used as electron-donating units and one dibenzo[a,c]phenazine group was used as an electron-withdrawing motif. In W1, two additional cyano groups were attached to the dibenzo[a,c]phenazine unit to reinforce the electron-accepting strength. As a consequence, remarkable bathochromic shifts were observed in both the UV-vis absorption and photoluminescence spectra of W1 relative to those of W2. Furthermore, the incorporation of cyano groups into W1 led to a significant separation of the frontier molecular orbitals (FMOs), resulting in a small singlet–triplet splitting energy (ΔEST) and a strong intramolecular charge transfer (ICT) state. Notably, W1 possessed higher photoluminescence quantum yields (PLQYs) and better device performance than W2. The organic light-emitting diodes (OLEDs) based on W1 with a doping ratio of 10 wt% achieved a maximum external quantum (EQE) efficiency of 24.97%.

Graphical abstract: Highly efficient red thermally activated delayed fluorescence materials based on a cyano-containing planar acceptor

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Publication details

The article was received on 29 Sep 2019, accepted on 09 Nov 2019 and first published on 26 Nov 2019


Article type: Paper
DOI: 10.1039/C9TC05349B
J. Mater. Chem. C, 2019, Advance Article

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    Highly efficient red thermally activated delayed fluorescence materials based on a cyano-containing planar acceptor

    Y. Wang, Y. Zhang, K. Tong, L. Ding, J. Fan and L. Liao, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC05349B

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