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Issue 9, 2018
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Highly efficient blue organic light-emitting diodes from pyrimidine-based thermally activated delayed fluorescence emitters

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Abstract

Three highly efficient blue thermally activated delayed fluorescence (TADF) emitters, 2SPAc-HPM, 2SPAc-MPM and 2SPAc-PPM, have been synthesised based on pyrimidine (PM), 2-methylpyrimidine (MPM) and 2-phenylpyrimidine (PPM) as the acceptor and 10H-spiro[acridan-9,9′-fluorene] (2SPAc) as the donor moiety. With their appropriate molecular design, these emitters successfully achieve small singlet–triplet splitting energies for efficient reverse intersystem crossing, and exhibit high photoluminescence quantum yields. As a result, TADF OLEDs based on 2SPAc-HPM, 2SPAc-MPM and 2SPAc-PPM emit blue light peaking at 479–489 nm and generate very high external quantum efficiencies of 25.56%, 24.34% and 31.45%, respectively. The 2SPAc-PPM-based TADF OLED is also one of the very few blue TADF emitters with an external quantum efficiency of more than 30%, and it has the best OLED performance among the pyrimidine-based TADF emitters.

Graphical abstract: Highly efficient blue organic light-emitting diodes from pyrimidine-based thermally activated delayed fluorescence emitters

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Publication details

The article was received on 14 Dec 2017, accepted on 05 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C7TC05746F
Citation: J. Mater. Chem. C, 2018,6, 2351-2359
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    Highly efficient blue organic light-emitting diodes from pyrimidine-based thermally activated delayed fluorescence emitters

    B. Li, Z. Li, T. Hu, Y. Zhang, Y. Wang, Y. Yi, F. Guo and L. Zhao, J. Mater. Chem. C, 2018, 6, 2351
    DOI: 10.1039/C7TC05746F

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