Journal
CHEM
Volume 4, Issue 9, Pages 2154-2167Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2018.06.005
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Funding
- Changjiang Scholar Program of Chinese Ministry of Education [Q2016208]
- National Natural Science Foundation of China [21672056, 61605042, 21602048]
- Science and Technology Bureau of Heilongjiang Province [JC2015002]
- National Postdoctoral Program for Innovative Talents [BX201600048]
- Harbin Science and Technology Bureau [2015RAYXJ008]
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Thermally activated delayed fluorescence (TADF) diodes have emerged in recent years. However, blue devices still suffer from low luminance and serious efficiency roll-off, partially because of the utilization of unipolar host materials, which can suppress interaction-induced quenching at the cost of carrier flux unbalance. Herein, we demonstrate that the strong host excited-state dipole field can significantly worsen exciton quenching of blue TADF dopants through hostdopant dipole-dipole interactions. To integrate low excited-state polarity and ambipolar characteristics, we developed a donor-s-acceptor host with dramatically reduced excited-state dipole moments by one order of magnitude to only similar to 2 Debye, which gave rise to state-of-the-art external quantum efficiency beyond 20% from its devices, as well as record-low roll-off. Comparison between the device efficiencies of the hosts and various excited-state polarities revealed that the suppression of dipole-dipole interaction-induced quenching is the primary determinant of device performance for ambipolar blue TADF hosts.
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