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Blue TADF Emitters Based on Indenocarbazole Derivatives with High Photoluminescence and Electroluminescence Efficiencies

Lv, Xialei; Huang, Rongjuan; Sun, Shuaiqiang; Zhang, Qing; Xiang, Songpo; Ye, Shaofeng; Leng, Panpan; Dias, Fernando B.; Wang, Lei

Blue TADF Emitters Based on Indenocarbazole Derivatives with High Photoluminescence and Electroluminescence Efficiencies Thumbnail


Authors

Xialei Lv

Rongjuan Huang

Shuaiqiang Sun

Qing Zhang

Songpo Xiang

Shaofeng Ye

Panpan Leng

Lei Wang



Abstract

A series of blue thermally activated delayed fluorescence (TADF) emitters were designed and synthesized, using 2,4,6-triphenyl-1,3,5-triazine as the acceptor unit, and indenocarbazole derivatives as the electron-donating moiety. In contrast with other six-membered heterocycles, like phenothiazine, phenoxazine and dihydroacridine, where the TADF efficiency is affected by the presence of different conformers, indenocarbazole derivatives do not show this effect. Therefore, InCz23FlTz, InCz23DPhTz, InCz23DMeTz and InCz34DPhTz allow to investigate the effect of different substituents and substitution positions on TADF properties, without the influence of different conformation. We have demonstrated that the substituted position on the carbazole and different substituents in the same position have clear influence on the donor character of indenocarbazole derivatives. Also, the color purity of blue emission and excited states could be adjusted by substituents and substituted position, thus excellent blue emitters can be obtained. Besides, the four compounds show relatively small TADF contribution under optical excitation, however excellent performances are obtained in the electroluminescent devices, especially with InCz34DPhTz, which shows a maximum external quantum efficiency (EQE) around 26%. In the end, we find an effective way to design high efficiency blue TADF materials and deeply study the relation between structure and property in indenocarbazole derivatives.

Citation

Lv, X., Huang, R., Sun, S., Zhang, Q., Xiang, S., Ye, S., …Wang, L. (2019). Blue TADF Emitters Based on Indenocarbazole Derivatives with High Photoluminescence and Electroluminescence Efficiencies. ACS Applied Materials and Interfaces, 11(11), 10758-10767. https://doi.org/10.1021/acsami.8b20699

Journal Article Type Article
Acceptance Date Feb 22, 2019
Online Publication Date Feb 22, 2019
Publication Date Mar 20, 2019
Deposit Date Feb 27, 2019
Publicly Available Date Feb 22, 2020
Journal ACS Applied Materials and Interfaces
Print ISSN 1944-8244
Electronic ISSN 1944-8252
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 11
Issue 11
Pages 10758-10767
DOI https://doi.org/10.1021/acsami.8b20699

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.8b20699







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