@article{e8f3371eb5734f228bd538248117b411,
title = "Thermally activated delayed fluorescence of carbazole-benzophenone dendrimers with bulky substituents",
abstract = "Carbazole dendrimers with a benzophenone core and bulky terminal substituents were synthesized, and their thermally activated delayed fluorescence (TADF) properties were investigated. The adamantane (Ad) substituted dendrimer showed green TADF emission with a PLQY of 40% in the neat film. The tetraphenylphenyl (TPPh) substituted dendrimer showed blue emission with a PLQY of 11% in the neat film but did not show effective TADF. The dendrimer and dendron (fragment) phosphorescence measurement revealed that the TPPh substituted carbazole dendron has low triplet energy. This will reduce the TADF efficiency. Also a new deactivation path due to the large freedom in the rotation of TPPh substituents leads to non-radiative deactivation and quenches the TADF emission. Simple terminal modification can minimize the intermolecular interaction and tune the on-off of the TADF, which gives insights for designing efficient TADF materials.",
author = "Ken Albrecht and Eri Hisamura and Minori Furukori and Yasuo Nakayama and Takuya Hosokai and Kohei Nakao and Hiroki Ikebe and Akira Nakayama",
note = "Funding Information: This work was supported, in part, by JSPS KAKENHI Grant No. JP18H03902, JP20H02801, JP21H05399 and JP21H05405, JST PRESTO Grant Number JPMJPR18T2, Tobe Maki Foundation, Tokuyama Science Foundation, the Futaba Foundation, Leading Initiative for Excellent Young Researchers, microstructural characterization platform as a program of “Nanotechnology Platform” Grant Number JPMXP09A19AT0001, and Cooperative Research Program of “Network Joint Research Center for Materials and Devices”, Grant Number 20201309 of the Ministry of Education, Culture, Sports, Science and Technology (MEXT). Part of the calculations was performed on supercomputers at RCCS (Okazaki), RIIT (Kyushu Univ.), and the Center for Computational Materials Science, Institute for Materials Research (Tohoku University, Proposal No. 202012-SCKXX-0012). Publisher Copyright: {\textcopyright} 2022 The Royal Society of Chemistry.",
year = "2022",
doi = "10.1039/d2py00255h",
language = "English",
journal = "Polymer Chemistry",
issn = "1759-9954",
publisher = "Royal Society of Chemistry",
}