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

Jinhyo Hwang, Jiwon Yoon, Chae Yeong Kim, Suna Choi, Hyunchul Kang, Jun Yun Kim, Dae Wi Yoon, Chang Wook Han, Sungnam Park, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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 (T1 = 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.

Original languageEnglish
Article number108403
JournalDyes and Pigments
Volume179
DOIs
Publication statusPublished - 2020 Aug

Keywords

  • Host material
  • Organic light-emitting diode
  • Pyridine
  • Solution process
  • Tercarbazole
  • Thermally activated delayed fluorescence

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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