Issue 31, 2024

Integration of a bulky adamantane unit with 9-phenyl-9H-3,9′-bicarbazole: a novel host design for solution-processed narrowband TADF-OLEDs

Abstract

To achieve high efficiency and reliability in thermally activated delayed fluorescence (TADF) and phosphorescent organic light-emitting diodes (OLEDs), developing a novel host system has emerged as a critical research theme. In this study, we synthesized CzCzPh-mAd (9-(3-((1s,3s)-adamantan-1-yl)phenyl)-9H-3,9′-bicarbazole) as a p-type host by incorporating a bulky adamantane moiety fused with three cyclohexanes into CzCzPh (9-phenyl-9H-3,9′-bicarbazole). By incorporating a large and rigid adamantane group into the CzCzPh host (CzCzPh-mAd), we aimed to maintain the electrochemical and photophysical properties of CzCzPh while increasing its molecular weight, film-forming characteristics, and thermal stability. Ultimately, the solution-processed narrowband blue TADF-OLED employing the CzCzPh-mAd host exhibited a high external quantum efficiency greater than 13% and demonstrated superior thermal stability and reproducibility in device efficiency compared to devices based on CzCzPh.

Graphical abstract: Integration of a bulky adamantane unit with 9-phenyl-9H-3,9′-bicarbazole: a novel host design for solution-processed narrowband TADF-OLEDs

Supplementary files

Article information

Article type
Paper
Submitted
20 May 2024
Accepted
02 Jul 2024
First published
02 Jul 2024

J. Mater. Chem. C, 2024,12, 11836-11845

Integration of a bulky adamantane unit with 9-phenyl-9H-3,9′-bicarbazole: a novel host design for solution-processed narrowband TADF-OLEDs

H. Kwak, N. Peethani, S. H. Park, N. Y. Kwon, J. Y. Park, M. J. Kang, C. Y. Park, H. Y. Kim, C. S. Hong, S. Park, M. J. Cho and D. H. Choi, J. Mater. Chem. C, 2024, 12, 11836 DOI: 10.1039/D4TC02070G

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