Unconventional Three-Armed Luminogens Exhibiting Both Aggregation-Induced Emission and Thermally Activated Delayed Fluorescence Resulting in High-Performing Solution-Processed Organic Light-Emitting Diodes
- Authors
- Park, Seo Yeon; Choi, Suna; Park, Gi Eun; Kim, Hyung Jong; Lee, Chiho; Moon, Ji Su; Kim, Si Woo; Park, Sungnam; Kwon, Jang Hyuk; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 2-5월-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- three-armed luminogen; aggregation-induced emission; solution-process; thermally activated delayed fluorescence; organic light-emitting diodes
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.10, no.17, pp.14966 - 14977
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 10
- Number
- 17
- Start Page
- 14966
- End Page
- 14977
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/75576
- DOI
- 10.1021/acsami.7b19681
- ISSN
- 1944-8244
- Abstract
- In this work, three-armed luminogens IAcTr-out and IAcTr-in were synthesized and used as emitters bearing triazine and indenoacridine moieties in thermally activated delayed fluorescence organic light-emitting diodes (OLEDs). These molecules could form a uniform thin film via the solution process and also allowed the subsequent deposition of an electron transporting layer either by vacuum deposition or by an all-solution coating method. Intriguingly, the new luminogens displayed aggregation-induced emission (AIE), which is a unique photophysical phenomenon. As a nondoped emitting layer (EML), IAcTr-in showed external quantum efficiencies (EQEs) of 11.8% for the hybrid-solution processed OLED and 10.9% for the all-solution processed OLED with a low efficiency roll-off. This was evident by the higher photoluminescence quantum yield and higher rate constant of reverse intersystem crossing of IAcTr-in, as compared to IAcTr-out. These AIE luminogens were used as dopants and mixed with the well-known host material 1,3-bis(N-carbazolyl)benzene (mCP) to produce a high-efficiency OLED with a two-component EML. The maximum EQE of 17.5% was obtained when using EML with IAcTr-out doping (25 wt %) into mCP, and the OLED with EML bearing IAcTr-in and mCP showed a higher maximum EQE of 18.4% as in the case of the nondoped EML-based device.
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