期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 14, 页码 13460-13471出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b18284
关键词
exciplex; thermally activated delayed fluorescence; TADF; OLED; photophysics
资金
- EXCILIGHT project - European Union's Horizon 2020 Research and Innovation Programme [674990]
- Polish National Science Centre [2017/25/B/STS/02488]
The investigation of nondoped exciplex blends of 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine (PO-T2T), working as the one-electron acceptor molecule, with different electron donors is reported. The emissions of these exciplexes span from the blue to orange red regions, showing clear contribution from thermally activated delayed fluorescence (TADF) and delayed fluorescence originated from non geminate recombination of charge carriers created by the dissociation of optically generated exciplexes. We focus our studies on the properties of TADF in these systems, covering in particular the physical meaning of the different transient components observed in their luminescence decays. Our results unravel the intricate role of reverse intersystem crossing due to spin-orbit coupling and possibly also due to hyperfine interactions and internal conversion, which affect the efficiency of the TADF mechanism. Remarkable performances are obtained in prototype organic light-emitting diodes fabricated with some of these blends. Green exciplex blends, in particular, exhibited the current efficiency of 60 cd A(-1), power efficiency of 71 lm W-1, and external quantum efficiency of 20%. We believe that our results will contribute significantly to highlight the potential advantages of intermolecular exciplexes in the area of organic light-emitting diodes.
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