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.
Original language | English |
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Pages (from-to) | 1692-1699 |
Number of pages | 8 |
Journal | Polymer Chemistry |
Volume | 12 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2021 Mar 21 |
Bibliographical note
Publisher Copyright:© The Royal Society of Chemistry.
ASJC Scopus subject areas
- Bioengineering
- Polymers and Plastics
- Biochemistry
- Organic Chemistry