Structural isomers of 9-(pyridin-2-yl)-9H-carbazole in combination with 9 ' H-9,3 ':6 ',9 ''-tercarbazole and their application to high efficiency solution processed green TADF OLEDs
- Authors
- Hwang, Jinhyo; Yoon, Jiwon; Kim, Chae Yeong; Choi, Suna; Kang, Hyunchul; Kim, Jun Yun; Yoon, Dae-Wi; Han, Chang Wook; Park, Sungnam; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 8월-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Tercarbazole; Pyridine; Host material; Solution process; Thermally activated delayed fluorescence; Organic light-emitting diode
- Citation
- DYES AND PIGMENTS, v.179
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 179
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/53864
- DOI
- 10.1016/j.dyepig.2020.108403
- ISSN
- 0143-7208
- Abstract
- Two host materials, CzPy2TCz and CzPy3TCz, were designed as structural isomers and synthesized to achieve high efficiency thermally activated delayed fluorescence-organic light emitting diodes (TADF-OLEDs). The design strategy involved introducing a pyridine group into the core structure as an electron-withdrawing unit and varying the substitution position of tercarbazole (TCz). To realize green TADF-OLED, the two host materials synthesized in this study have excellent thermal stability and high excited triplet energy (T-1 = 2.95-2.98 eV). The maximum external quantum efficiency and current efficiency values for CzPy2TCz were 23.81% and 80.2 cd/A, respectively and the respective values for CzPy3TCz were 20.27% and 70.1 cd/A, respectively. Structural isomers with carbazole (Cz) and TCz units at the 2,6-position of the pyridine core effectuate better device performance. Consequently, we found that the host materials introduced in this study play an important role in implementing high performing solution-processed green TADF-OLED.
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Collections - College of Science > Department of Chemistry > 1. Journal Articles
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