Efficient and stable sky-blue delayed fluorescence organic light-emitting diodes with CIE y below 0.4

Chin Yiu Chan, Masaki Tanaka, Hajime Nakanotani, Chihaya Adachi

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64 Citations (Scopus)


Organic light-emitting diodes utilizing thermally activated delayed fluorescence is a potential solution for achieving stable blue devices. Sky-blue devices (CIE y < 0.4) with high stability and high external quantum efficiency (>15%) at 1000 cd m −2 based on either delayed fluorescence or phosphorescence are still limited and very hard to achieve simultaneously. Here, we report the design and synthesis of a new thermally activated delayed fluorescence emitter, 3Ph 2 CzCzBN. A sky-blue device based on 3Ph 2 CzCzBN exhibits a high external quantum efficiency of 16.6% at 1000 cd m −2 . The device shows a sky-blue electroluminescence of 482 nm and achieves Commission Internationale de l’ Eclairage coordinates of (0.17, 0.36). The sky-blue device exhibits a superb LT 90 of 38 h. This is the first demonstration of high-efficiency and stable sky-blue devices (CIE y < 0.4) based on delayed fluorescence, which represents an important advance in the field of blue organic light-emitting diode technology.

Original languageEnglish
Article number5036
JournalNature communications
Issue number1
Publication statusPublished - Dec 1 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)


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