Issue 1, 2023

Carbazole-substituted benzobisoxazoles: near-UV fluorescent emitters and ambipolar hosts for organic light-emitting diodes

Abstract

The design of organic light emitting diode (OLED) materials with the potential for exhibiting thermally-activated delayed fluorescence (TADF) is reported. Using computational methods (DFT/TD-DFT) as a guiding tool, six materials with a benzobisoxazole (BBO) core and donor–acceptor–donor architectures were designed by changing the conjugation position of carbazole-substituted phenyl substituents and the type of BBO isomer (cis- vs. trans-). Experimental steady-state and transient absorption spectroscopic techniques were utilized to probe the TADF activity of these molecules. Each material was then used in host–guest OLED devices as either near-UV dopants or host with low singlet-triplet energy differences. The electroluminescent properties show that when used as dopants these materials provide near-UV emission (CIEy < 0.06 and CIEx = 0.16), whereas when used as hosts, these materials show reduced operating voltages and increased performance efficiencies when compared to commercial materials.

Graphical abstract: Carbazole-substituted benzobisoxazoles: near-UV fluorescent emitters and ambipolar hosts for organic light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
29 7 2022
Accepted
17 11 2022
First published
25 11 2022

J. Mater. Chem. C, 2023,11, 211-222

Author version available

Carbazole-substituted benzobisoxazoles: near-UV fluorescent emitters and ambipolar hosts for organic light-emitting diodes

D. L. Wheeler, L. Fisher, P. Friederich, C. Cunningham, A. K. Muthike, A. Aspuru-Guzik, T. Goodson and M. Jeffries-EL, J. Mater. Chem. C, 2023, 11, 211 DOI: 10.1039/D2TC03190F

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