NDLI: twisted donor – acceptor delayed fl uorescence molecules : a new universal platform for highly e ffi cient blue electroluminescence †

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twisted donor – acceptor delayed fl uorescence molecules : a new universal platform for highly e ffi cient blue electroluminescence †

Content Provider	Semantic Scholar
Author	Komiyamaa, Hideaki Yasuda, Takuma
Copyright Year	2017
Abstract	Deep-blue emitters that can harvest both singlet and triplet excited states to give high electron-to-photon conversion efficiencies are highly desired for applications in full-color displays and white lighting devices based on organic light-emitting diodes (OLEDs). Thermally activated delayed fluorescence (TADF) molecules based on highly twisted donor–acceptor (D–A) configurations are promising emitting dopants for the construction of efficient deep-blue OLEDs. In this study, a simple and versatile D–A system combining acridan-based donors and pyrimidine-based acceptors has been developed as a new platform for high-efficiency deep-blue TADF emitters. The designed pre-twisted acridan–pyrimidine D–A molecules exhibit small singlet–triplet energy splitting and high photoluminescence quantum yields, functioning as efficient deep-blue TADF emitters. The OLEDs utilizing these TADF emitters display bright blue electroluminescence with external quantum efficiencies of up to 20.4%, maximum current efficiencies of 41.7 cd A , maximum power efficiencies of 37.2 lm W , and color coordinates of (0.16, 0.23). The design strategy featuring such acridan–pyrimidine D–A motifs can offer great prospects for further developing high-performance deep-blue TADF emitters and TADF-OLEDs.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://pubs.rsc.org/en/content/articlepdf/2017/sc/c6sc03793c
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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