Controlled emission colors and singlet-triplet energy gaps of dihydrophenazine-based thermally activated delayed fluorescence emitters

Jiyoung Lee, Katsuyuki Shizu, Hiroyuki Tanaka, Hajime Nakanotani, Takuma Yasuda, Hironori Kaji, Chihaya Adachi

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81 Citations (Scopus)

Abstract

We have developed thermally activated delayed fluorescence (TADF) emitters containing 5,10-dihydrophenazine as an electron donor and various electron-acceptor units. The TADF emitters exhibit wide ranges of emission colors from green to orange, singlet-triplet energy gaps ΔEST of ∼0-0.19 eV, and delayed fluorescence lifetimes τd of 0.1-50 μs. An organic light-emitting diode containing one of the TADF emitters exhibits a maximum external quantum efficiency (EQE) of 12%, which is higher than those obtained with conventional fluorescent emitters. Time-resolved photoluminescence measurements of the compounds in a host matrix reveal that TADF makes a large contribution to the EQE of the devices. Our findings provide guidelines for modulating ΔEST and τd of TADF emitters.

Original languageEnglish
Pages (from-to)2175-2181
Number of pages7
JournalJournal of Materials Chemistry C
Volume3
Issue number10
DOIs
Publication statusPublished - Mar 14 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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