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2,3-Dimethylindole as Donor for Novel Thermally Activated Delayed Fluorescence Emitters

Abstract

A couple of indole derivatives based light-emitting molecules were synthesized and studied. They shared the same donor unit, 2,3-dimethylindole, were quite similar in emission color. In addition, they possessed almost the same lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) energy levels. However, their discrepancy in the amount of 2,3-dimethylindole donor units resulted in different energy gaps between singlet and triplet states as well as efficiency of reverse intersystem crossing (RISC) process. OLED device based on these 2,3-dimethylindole compounds displayed external quantum efficiencies of 6.3% and 16.5% with greenish blue emission, respectively.

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Article information


Submitted
18 Nov 2019
Accepted
09 Jan 2020
First published
10 Jan 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

2,3-Dimethylindole as Donor for Novel Thermally Activated Delayed Fluorescence Emitters

M. Liu, M. Shi and H. Meng, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/C9NJ05736F

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