Oxadiazole- and triazole-based highly-efficient thermally activated delayed fluorescence emitters for organic light-emitting diodes

Jiyoung Lee, Katsuyuki Shizu, Hiroyuki Tanaka, Hiroko Nomura, Takuma Yasuda, Chihaya Adachi

Research output: Contribution to journalArticle

241 Citations (Scopus)

Abstract

We developed highly-efficient thermally activated delayed fluorescence (TADF) emitters containing 2,5-diphenyl-1,3,4-oxadiazole (OXD) or 3,4,5-triphenyl-4H-1,2,4-triazole (TAZ) electron acceptor and phenoxazine (PXZ) electron donor moieties. Oxadiazole-based compounds PXZ-OXD and 2PXZ-OXD showed green emission, while the triazole-based ones PXZ-TAZ and 2PXZ-TAZ exhibited sky-blue emission. In toluene solution, the donor-acceptor-donor-type molecules 2PXZ-OXD and 2PXZ-TAZ showed more efficient TADF and higher photoluminescence quantum yields (PLQYs) than the donor-acceptor-type molecules PXZ-OXD and PXZ-TAZ. When doped into a host material, 2PXZ-OXD displayed a high PLQY of 87%. An organic light-emitting diode using 2PXZ-OXD as an emitter exhibited an external quantum efficiency (EQE) of 14.9%, which exceeds those obtained with conventional fluorescent emitters. This high EQE results from the efficient generation of TADF in 2PXZ-OXD.

Original languageEnglish
Pages (from-to)4599-4604
Number of pages6
JournalJournal of Materials Chemistry C
Volume1
Issue number30
DOIs
Publication statusPublished - Sep 28 2013

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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