Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 28, Pages 24035-24042Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05615
Keywords
TADF; OLEDs; pure blue; ortho donor-acceptor; triarylboron
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1A2B4002468, NRF-2016R1D1A1B03930371]
- Priority Research Centers Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2009-0093818]
- Ministry of Science, ICT and Future Planning [NRF-2016M3A7B4910631]
- MSIP [NRF-2017R1A2B3010484, NRF-2015R1C1A1A01052947]
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A synthetic approach to highly efficient thermally activated delayed fluorescence (TADF) is proposed that uses ortho donor (D) acceptor (A) compounds (PXZoB, DPAoB, and CzoB), wherein the acceptor is based on triarylboron and the donor is phenoxazine (PXZ), diphenylamine (DPA), or carbazole (Cz). Combined with the ortho D-A connectivity, the bulky nature of the triarylboron endows the D-A dyads with inherent steric locking for a highly twisteD-Arrangement, leading to a small energy difference between singlet and triplet excited states (Delta E-sT) and thus exhibiting very efficient TADF with microsecond-range lifetimes. In sharp contrast, the Corresponding para D-A derivatives, DPApB and CzpB, only display short-lived, normal fluorescence. Organic light-emitting diodes (OLEDs) incorporating the proposed ortho D-A compounds as emitters display orange, greenish-blue, and pure blue emission and exhibit high external quantum efficiency (eta(EQE)). In particular, the pure blue OLEDs based on the proposed ortho D-A emitters with a carbazole donor (CzoB) show a record-high eta(EQE) of 22.6% with CIE color coordinates of (0.139, 0.150), well illustrating the validity of the proposeD-Approach. Upon optical optimization, the eta(EQE) is further improved to 24.1%.
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