2023/05/16 by Sen Wu, Le Zhang, Jingxiang Wang +3 · 1 voice · 2 citations
Engineering · Materials Science · #Organic Light-Emitting Diodes Research #Organic Electronics and Photovoltaics #Conducting polymers and applications
paper · pdf · doi:10.1002/anie.202305182
openalex publication_date 2023/05/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/14
Abstract Multiresonant thermally activated delayed fluorescence (MR‐TADF) compounds are attractive as emitters for organic light‐emitting diodes (OLEDs) as they can simultaneously harvest both singlet and triplet excitons to produce light in the device and show very narrow emission spectra, which translates to excellent color purity. Here, we report the first example of an MR‐TADF emitter (DOBDiKTa) that fuses together fragments from the two major classes of MR‐TADF compounds, those containing boron (DOBNA) and those containing carbonyl groups (DiKTa) as acceptor fragments in the MR‐TADF skeleton. The resulting molecular design, this compound shows desirable narrowband pure blue emission and efficient TADF character. The co‐host OLED with DOBDiKTa as the emitter showed a maximum external quantum efficiency (EQE max ) of 17.4 %, an efficiency roll‐off of 32 % at 100 cd m −2 , and Commission Internationale de l’Éclairage (CIE) coordinates of (0.14, 0.12). Compared to DOBNA and DiKTa, DOBDiKTa shows higher device efficiency with reduced efficiency roll‐off while maintaining a high color purity, which demonstrates the promise of the proposed molecular design.