Highly effective organic light-emitting diodes containing thermally activated delayed fluorescence emitters with horizontal molecular orientation

Chan Hee Lee, Shin Hyung Choi, Sung Joon Oh, Jun Hyeon Lee, Jae Won Shim, Chihaya Adachi, Sae Youn Lee

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we report new thermally activated delayed fluorescence (TADF) emitters, AcPYM (10,10′-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine)) and PxPYM (10,10′-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(10H-phenoxazine)), by employing donor units at the 2,5-positions of the pyrimidine acceptor unit. The donor-Acceptor-donor (D-A-D) units combined in the linear molecular structure of AcPYM or PxPYM enhanced the horizontally oriented alignment, and the horizontal transition dipole moments were realized by up to 87% in the host matrix. Organic light-emitting diodes (OLEDs) containing AcPYM and PxPYM emitters realized external quantum efficiencies (ηext) of 16.8% for blue and green emissions.

Original languageEnglish
Pages (from-to)42897-42902
Number of pages6
JournalRSC Advances
Volume10
Issue number70
DOIs
Publication statusPublished - Nov 26 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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