Lifetime-Extending 3-(4-Phenylbenzo[4,5]thieno[3,2-d]pyrimidin-2-yl)benzonitrile Acceptor for Thermally Activated Delayed Fluorescence Emitters
- Authors
- Lee, Ha Lim; Oh, Chan Seok; Lee, Kyung Hyung; Lee, Jun Yeob; Hong, Wan Pyo
- Issue Date
- Jan-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- electron acceptor; OLED; delayed fluorescence; efficiency; lifetime
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.13, no.2, pp.2908 - 2918
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 13
- Number
- 2
- Start Page
- 2908
- End Page
- 2918
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/84587
- DOI
- 10.1021/acsami.0c17819
- ISSN
- 1944-8244
- Abstract
- Highly efficient and long-living green thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) were developed using benzothienopyrimidine-4-benzonitrile acceptor-derived compounds as the TADF emitters. A molecular design merging the benzothienopyrimidine-4-benzonitrile acceptor with either indolocarbazole or diindolocarbazole was employed to prepare two TADF emitters, 5-(2-phenylbenzo [4,5]thieno [3,2-d] pyrimidin-4-yl)-2-(5-phenylindolo[3,2-a]carbazol-12(5H)-yl)benzonitrile and 2-(10,15-diphenyl-10,15-dihydro-5H-diindolo[3,2-a:3',2'-c] carbazol-5-yl) -5-(2-ph[4,5] thieno[3,2-d] pyrimidin-4-yl)benzonitrile (BTPDIDCz), as the green and greenish-yellow emitters. Among the two emitters, BTPDIDCz with the diindolocarbazole donor combined with the benzothienopyrimidine-4-benzonitrile acceptor demonstrated a high external quantum efficiency of 24.5% and 3 times longer device lifetime than the state-of-the-art green emitter. Thic work proposed the potential of benzothienopyrimidine-4-benzonitrile as the acceptor for long lifetime in TADF emitters.
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