Achieving efficient violet-blue electroluminescence with CIE y <0.06 and EQE >6% from naphthyl-linked phenanthroimidazole-carbazole hybrid fluorophores

Chemical Science
Wen-Cheng ChenChun-Sing Lee

Abstract

In this work, we revealed a new approach for the development of efficient violet-blue emitting materials featuring a hybrid local and charge transfer (HLCT) excited state through the incorporation of naphthyl group(s) as a weak n-type π spacer in a donor-π-acceptor (D-π-A) system. The resulting materials (TPINCz and TPIBNCz) show improved intramolecular charge transfer properties and highly efficient violet-blue fluorescence. It is demonstrated that the pattern of the π spacers has significant influence on the photophysical properties. The incorporation of a naphthyl/binaphthyl spacer between the donor and acceptor moieties can alleviate the common dilemma that enhancing device performance by increasing the charge transfer excited properties often leads to red-shifted emissions. A device using TPINCz as an emissive dopant shows a violet-blue emission with CIE coordinates of (0.153, 0.059) and a record high EQE of 6.56 ± 0.11% at a brightness of 1000 cd m-2. To the best of our knowledge, this performance is the highest among the reported devices with CIE y ≤0.08. Our study provides a new pathway for the design of high-performance violet-blue emitters with a D-π-A architecture in organic electroluminescence applications.

References

Mar 11, 2010·Advanced Materials·Kiran T KamtekarMartin R Bryce
Mar 28, 2012·The Journal of Medical Investigation : JMI·Le Thi Tuyet NhungMasanobu Haraguchi
Aug 31, 2012·Journal of the American Chemical Society·Qisheng ZhangChihaya Adachi
Jan 9, 2013·Chemistry : a European Journal·Zhao GaoYuguang Ma
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Apr 22, 2016·ACS Applied Materials & Interfaces·Ilya KondrasenkoIgor O Koshevoy

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Citations

Jun 3, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Mukundam VangaKrishnan Venkatasubbaiah
Dec 2, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhenyu ZhangYue Wang
Mar 22, 2020·Scientific Reports·Jayaraman JayabharathiVenugopal Thanikachalam
Nov 25, 2020·Chemical Society Reviews·Yuwei XuYuguang Ma
Jun 22, 2021·Chemical Society Reviews·Shuo Chen, Hui Xu
Nov 9, 2021·The Journal of Organic Chemistry·Wanwan LiLijuan Jiao

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Methods Mentioned

BETA
differential scanning calorimetry

Software Mentioned

TPINCz

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