5H-Benzo[d]Benzo[4,5]Imidazo[2,1-b][1,3]Thiazine as a Novel Electron-Acceptor Cored High Triplet Energy Bipolar Host Material for Efficient Solution-Processable Thermally Activated Delayed Fluorescence Organic Light-Emitting Diodes
- Authors
- Godumala, Mallesham; Yoon, Jiwon; Park, Seo Yeon; Lee, Chiho; Kim, Youngseo; Jeong, Ji-Eun; Park, Sungnam; Woo, Han Young; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 7-2월-2020
- Publisher
- FRONTIERS MEDIA SA
- Keywords
- new electron-acceptor core; bipolar hosts; thermally activated delayed fluorescence; solution process; organic light emitting diodes
- Citation
- FRONTIERS IN CHEMISTRY, v.8
- Indexed
- SCIE
SCOPUS
- Journal Title
- FRONTIERS IN CHEMISTRY
- Volume
- 8
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57682
- DOI
- 10.3389/fchem.2020.00061
- ISSN
- 2296-2646
- Abstract
- Organic entities that can transport electrons are seldom available to develop adequate bipolar host materials applicable for solution-processable thermally activated delayed fluorescence (TADF)-organic light-emitting diodes (OLEDs). Therefore, the introduction of new electron-affine entities that plausibly demonstrate high triplet energy (E-T) is of urgent need. In this contribution, we introduced benzimidazo[1,2-a][3,1]benzothiazine (BBIT) as a novel electron-affine entity and developed two new bipolar host materials, CzBBIT and 2CzBBIT. Both host materials exhibit high E-T of 3.0 eV, superior thermal robustness with the thermal decomposition temperature of up to 392 degrees C, a glass transition temperature of up to 161 degrees C, and high solubility in common organic solvents. Consequently, the solution-processable OLEDs fabricated using a recognized IAcTr-out as the green TADF emitter doped into CzBBIT as the host, realized a maximum external quantum efficiency (EQE) of 23.3%, while the 2CzBBIT:IAcTr-out blend film-based device displayed an EQE of 18.7%. These outcomes corroborated that this work could shed light on the scientific community on the design of new electron-affine entities to establish the effective use of bipolar host materials toward proficient solution-processable TADF-OLEDs.
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