3 years ago

Unique Solid-State Emission Behavior of Aromatic Difluoroboronated β-Diketones as an Emitter in Organic Light-Emitting Devices

Unique Solid-State Emission Behavior of Aromatic Difluoroboronated β-Diketones as an Emitter in Organic Light-Emitting Devices
Kanako Sasaki, Hisahiro Sasabe, Natsuki Onuma, Minoru Yamaji, Taiki Watanabe, Yurie Suwa, Junji Kido, Kohei Nakao, Michitaka Mamiya
Aromatic difluoroboronated β-diketone (BF2DK) derivatives are a widely known class of luminescent organic materials that exhibit high photoluminescent quantum efficiency and unique aggregation-dependent fluorescence behavior. However, there have been only a few reports on their use in solid-state electronic devices, such as organic light-emitting devices (OLEDs). Herein, we investigated the solid-state properties and OLED performance of a series of π-extended BF2DK derivatives that have previously been shown to exhibit intense fluorescence in the solution state. The BF2DK derivatives formed exciplexes with a carbazole derivative and exhibited thermally activated delayed fluorescence (TADF) behavior to give orange electroluminescence with a peak external quantum efficiency of 10 % that apparently exceeds the theoretical efficiency limit of conventional fluorescent OLEDs (7.5 %), assuming a light out-coupling factor of 30 %. Exceptional orange emission: An aromatic difluoroboronated β-diketone can form an exciplex to give orange electroluminescence with an external quantum efficiency (EQE) of 10 % that exceeds the theoretical efficiency limit of conventional fluorescent organic LEDs (see figure; PLQY=photoluminescence quantum efficiency; TADF=thermally activated delayed fluorescence).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/asia.201700800

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