Journal
ORGANIC ELECTRONICS
Volume 38, Issue -, Pages 69-73Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.08.001
Keywords
OLED; TADF; Efficiency roll-off; Exciplex
Funding
- National Natural Science Foundation of China [61376022, 61575192, 61376062]
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Highly efficient thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) based on exciplex are demonstrated in a blended system with commercially available 1,1-bis((di-4-tolylamino)phenyl)cyclohexane (TAPC) and 2,4,6-tris(biphenyl-3-yl)-1,3,5-triazine (T2T). By well adjusting the ratio between these two materials, the optimized device shows a low turn-on voltage of 2.4 V and a high external quantum efficiency (EQE) of 11.6%. More importantly, the device retains an EQE of 9.4% even at a high luminescence of 1000 cd/m(2). The low efficiency roll-off is attributed to the small singlet-triplet splitting and the short of the delayed fluorescence lifetime. Both EQE and efficiency roll-off are ones of the best performance among the reported TADF OLEDs based on exciplex. (C) 2016 Elsevier B.V. All rights reserved.
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