Molecular design of highly effective thermally activated delayed fluorescence emitters based on ortho-substituted donor-acceptor-donor pyridinecarbonitrile derivatives and their application for high-performance OLEDs

Shin Hyung Choi, Chan Hee Lee, Chihaya Adachi, Sae Youn Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work, we designed and investigated two TADF molecules, AcCN and PxCN, introducing donor moieties into the 3,5-position of 4-pyridinecarbonitrile acceptor core. These D‒A‒D type compounds exhibit effective utilization of triplet excitons through a reverse intersystem crossing (RISC) process with relatively small singlet-triplet energy splitting (ΔEST) values less than 0.1 eV. With their high PL quantum yield (ΦPL) and sufficient rate constant for RISC process (kRISC), organic light-emitting diodes (OLEDs) employing AcCN and PxCN as emitters achieve a maximum external quantum efficiency (ηext) of 20.6% and 15.5%, respectively, with green emissions.

Original languageEnglish
Article number107775
JournalDyes and Pigments
Volume171
DOIs
Publication statusPublished - Dec 2019

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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