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Blue TADF emitters based on indenocarbazole derivatives with high photoluminescence and electroluminescence efficiencies.

Lv, Xialei and Huang, Rongjuan and Sun, Shuaiqiang and Zhang, Qing and Xiang, Songpo and Ye, Shaofeng and Leng, Panpan and Dias, Fernando B. and Wang, Lei (2019) 'Blue TADF emitters based on indenocarbazole derivatives with high photoluminescence and electroluminescence efficiencies.', ACS applied materials & interfaces., 11 (11). pp. 10758-10767.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1021/acsami.8b20699
Publisher 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
Date accepted:22 February 2019
Date deposited:28 February 2019
Date of first online publication:22 February 2019
Date first made open access:22 February 2020

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