Modular design for constructing narrowband deep-blue multiresonant thermally activated delayed fluorescent emitters for efficient organic light emitting diodes
- Authors
- Naveen, Kenkera Rayappa; Lee, Hyuna; Seung, Lee Hyun; Jung, Young Hun; Prabhu, C. P. Keshavananda; Muruganantham, Subramanian; Kwon, Jang Hyuk
- Issue Date
- Jan-2023
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Deep blue; OLEDs; Multiple resonance effect; Thermally activated delayed fluorescence; Narrowband emission
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.451
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 451
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/91485
- DOI
- 10.1016/j.cej.2022.138498
- ISSN
- 1385-8947
1873-3212
- Abstract
- The simultaneous achievement of high efficiency and deep blue narmwband emission in multi resonant thermally activated delayed fluorescence (MR-TADF) materials are crucial and challenging. Herein we report two deep blue MR-TADF emitters, namely, TPD4PA and tBu-TPD4PA, using double boron, three nitrogen and two oxygen atoms. The design is based on amalgamating the high charge transfer (CT) characteristic moiety into MR-type fragments towards efficient MR-TADF emitters with improved CT characteristics. Both the materials show deep blue photo luminescent emissions of similar to 450 nm with a high photoluminescence quantum yield (PLQY) of similar to 90 %. These materials showed very small singlet-triplet gap (<0.06 eV) and a high rate of reverse intersystem crossing of similar to 2.5 x 10(5) s(-1). The TADF devices based on TPD4PA and tBu-TPD4PA showed maximum external quantum efficiencies of 30.7 and 32.5 %, respectively. Furthermore, both devices exhibited narrow band deep blue emissions and corresponding CIE y coordinates 0.06 and 0.07, which match near NTSC and BT2020 blue color requirements.
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