Electrogenerated chemiluminescence of donor-acceptor molecules with thermally activated delayed fluorescence

Ryoichi Ishimatsu, Shigeyuki Matsunami, Takashi Kasahara, Jun Mizuno, Tomohiko Edura, Chihaya Adachi, Koji Nakano, Toshihiko Imato

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

The electrochemistry and electrogenerated chemiluminescence (ECL) of four kinds of electron donor-acceptor molecules exhibiting thermally activated delayed fluorescence (TADF) is presented. TADF molecules can harvest light energy from the lowest triplet state by spin up-conversion to the lowest singlet state because of small energy gap between these states. Intense green to red ECL is emitted from the TADF molecules by applying a square-wave voltage. Remarkably, it is shown that the efficiency of ECL from one of the TADF molecule could reach about 50 %, which is comparable to its photoluminescence quantum yield. Donor-acceptor molecules with thermally activated delayed fluorescence (TADF) at room temperature can emit efficient electrogenerated chemiluminescence (ECL). Efficient spin up-conversion from triplet to singlet excited states through thermal activation is required to break through the theoretical limitation according to spin statistics (25 % of the quantum yield of photoluminescence). The ECL efficiency one TADF molecule reached about 50 %.

Original languageEnglish
Pages (from-to)6993-6996
Number of pages4
JournalAngewandte Chemie - International Edition
Volume53
Issue number27
DOIs
Publication statusPublished - 2014 Jul 1

Keywords

  • electrochemiluminescence
  • electrochemistry
  • kinetics
  • quantum yield
  • solvent effects

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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