Donor–σ–Acceptor Motifs: Thermally Activated Delayed Fluorescence Emitters with Dual Upconversion

Yan Geng, Anthony D'Aleo, Ko Inada, Lin Song Cui, Jong Uk Kim, Hajime Nakanotani, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)


A family of organic emitters with a donor–σ–acceptor (D-σ-A) motif is presented. Owing to the weakly coupled D-σ-A intramolecular charge-transfer state, a transition from the localized excited triplet state (3LE) and charge-transfer triplet state (3CT) to the charge-transfer singlet state (1CT) occurred with a small activation energy and high photoluminescence quantum efficiency. Two thermally activated delayed fluorescence (TADF) components were identified, one of which has a very short lifetime of 200–400 ns and the other a longer TADF lifetime of the order of microseconds. In particular, the two D-σ-A materials presented strong blue emission with TADF properties in toluene. These results will shed light on the molecular design of new TADF emitters with short delayed lifetimes.

Original languageEnglish
Pages (from-to)16536-16540
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number52
Publication statusPublished - Dec 22 2017

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)


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