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Manipulating positions of CH···N in acceptors of pyrimidine-pyridine hybrids for highly efficient sky-blue thermally activated delayed fluorescent OLEDs

Abstract

Three novel TADF materials, 10-(6-(2,6-diphenylpyrimidin-4-yl)pyridin-3-yl)-9,9-diphenyl-9,10-dihydroacridine (DPAc-4PyPM), 9,9-diphenyl-10-(4-(2-phenyl-6-(pyridin-2-yl)pyrimidin-4-yl)phenyl)-9,10-dihydroacridine (DPAc-6PyPM) and 10-(4-(2,6-diphenylpyrimidin-4-yl)phenyl)-9,9-diphenyl-9,10-dihydroacridine (DPAc-TPPM) have been designed and synthesized. The CH···N intramolecular hydrogen-bonding interactions were introduced in acceptors of pyrimidine-pyridine hybrids, which tuned TADF properties by skillful manipulating positions of CH···N in the acceptor moiety. Both DPAc-4PyPM and DPAc-6PyPM offered the higher PLQY than that of DPAc-TPPM. Simultaneously, the kRISC for DPAc-4PyPM realized the nearly 5 or 10 folds higher than it’s analogues. The optimized sky-blue device serving DPAc-4PyPM as dopant demonstrated the maximum external quantum efficiency, current efficiency and power efficiency of 24.34%, 53.89 cd A-1 and 36.79 lm W-1, which is comparable to most of the previously reported pyrimidine-based TADF OLEDs.

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Publication details

The article was received on 05 Aug 2018, accepted on 07 Sep 2018 and first published on 12 Sep 2018


Article type: Research Article
DOI: 10.1039/C8QM00382C
Citation: Mater. Chem. Front., 2018, Accepted Manuscript
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    Manipulating positions of CH···N in acceptors of pyrimidine-pyridine hybrids for highly efficient sky-blue thermally activated delayed fluorescent OLEDs

    Q. Zhang, S. Sun, X. Lv, W. liu, H. Zeng, R. Guo, S. Ye, P. Leng, S. Xiang and L. Wang, Mater. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QM00382C

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