Jump to main content
Jump to site search


New hole transport styrene polymers bearing highly π-extended conjugated side-chain moieties for high-performance solution-processable thermally activated delayed fluorescence OLEDs

Author affiliations

Abstract

Two new hole transport styrene polymers, 2DMFCz and 2DBFCz, were successfully synthesized via radical polymerization. The design concept aims to investigate the hole-transporting ability and energy-level tunability by introducing bis(9,9-dimethyl-9H-fluoren-2-yl)aminocarbazole and bis(dibenzo[b,d]furan-2-yl)aminocarbazole as side-chain pendants. They were found to show good solubility in chlorobenzene but poor solubility in toluene, similar to poly(9-vinylcarbazole) (PVK). The highest occupied molecular orbital levels of 2DMFCz and 2DBFCz were determined to be −5.23 eV and −5.31 eV, respectively, while hole mobilities were estimated to be 1.65 × 10−7 cm2 V−1 s−1 and 1.48 × 10−8 cm2 V−1 s−1 measured by the space-charge limited-current method. Subsequently, in solution-processed green thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs), the 2DMFCz- and 2DBFCz-based devices exhibited a relatively low turn-on voltage of 2.7 V and higher maximum external quantum efficiencies of 23.84% and 21.11%, respectively. These values were superior to those of a PVK-based device. The polymer hole-transport materials presented in this study are promising materials that can play a significant role in improving the performance of TADF-OLEDs fabricated through a solution process in the future.

Graphical abstract: New hole transport styrene polymers bearing highly π-extended conjugated side-chain moieties for high-performance solution-processable thermally activated delayed fluorescence OLEDs

Back to tab navigation

Supplementary files

Article information


Submitted
07 Jan 2021
Accepted
20 Feb 2021
First published
22 Feb 2021

Polym. Chem., 2021, Advance Article
Article type
Paper

New hole transport styrene polymers bearing highly π-extended conjugated side-chain moieties for high-performance solution-processable thermally activated delayed fluorescence OLEDs

J. H. Lee, J. Hwang, C. W. Kim, A. K. Harit, H. Y. Woo, H. J. Kim, Y. W. Kim, D. H. Choi, M. J. Cho and D. H. Choi, Polym. Chem., 2021, Advance Article , DOI: 10.1039/D1PY00026H

Social activity

Search articles by author

Spotlight

Advertisements