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

Chin-Yiu Chan, Masaki Tanaka, Hajime Nakanotani and Chihaya Adachi ()
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Chin-Yiu Chan: Kyushu University
Masaki Tanaka: Kyushu University
Hajime Nakanotani: Kyushu University
Chihaya Adachi: Kyushu University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Organic light-emitting diodes utilizing thermally activated delayed fluorescence is a potential solution for achieving stable blue devices. Sky-blue devices (CIEy 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, 3Ph2CzCzBN. A sky-blue device based on 3Ph2CzCzBN 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 LT90 of 38 h. This is the first demonstration of high-efficiency and stable sky-blue devices (CIEy

Date: 2018
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DOI: 10.1038/s41467-018-07482-6

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