Abstract:
:Organic light-emitting diodes utilizing thermally activated delayed fluorescence is a potential solution for achieving stable blue devices. Sky-blue devices (CIEy < 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, 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 < 0.4) based on delayed fluorescence, which represents an important advance in the field of blue organic light-emitting diode technology.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Chan CY,Tanaka M,Nakanotani H,Adachi Cdoi
10.1038/s41467-018-07482-6subject
Has Abstractpub_date
2018-11-28 00:00:00pages
5036issue
1issn
2041-1723pii
10.1038/s41467-018-07482-6journal_volume
9pub_type
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