@article{cfb42a3890e64e73bcd5cb39f5e0f7f4,
title = "Highly effective nicotinonitrile-derivatives-based thermally activated delayed fluorescence emitter with asymmetric molecular architecture for high-performance organic light-emitting diodes",
abstract = "In this paper, we report a new molecular architecture for increasing the emission efficiency of nicotinonitrile-derivatives-based donor-acceptor-donor combined thermally activated delayed fluorescence (TADF) emitters with asymmetric molecular architecture. The proposed molecular design facilitates highly effective TADF emission through a relatively small singlet (S1) and triplet (T1) energy gap (ΔEST ≈ 0.1 eV) and provides an increased reverse intersystem crossing efficiency (ΦRISC) of up to 86% from T1 to S1 states. Organic light-emitting diodes (OLEDs) employing the proposed asymmetric nicotinonitrile derivatives as emitters exhibit external quantum efficiencies (ηext) of up to 18.5% in greenish-blue and green emissions.",
author = "Choi, {Shin Hyung} and Lee, {Chan Hee} and Chihaya Adachi and Lee, {Sae Youn}",
note = "Funding Information: This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT & Future Planning (grant number: 2018R1C1B5044977 ) for S. Y. Lee and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (grant number: 20194030202320 ) awarded to S. H. Choi and C. H. Lee. C. Adachi acknowledges support from the Japan Science and Technology Agency (JST), ERATO , Adachi Molecular Exciton Engineering Project, under JST ERATO Grant Number JPMJER1305 , Japan, and the International Institute for Carbon Neutral Energy Research ( WPI-I2CNER ) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) . The authors thank J. U. Kim for measurement of photophysical properties and fruitful discussions regarding this work. Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",
year = "2020",
month = jan,
doi = "10.1016/j.dyepig.2019.107849",
language = "English",
volume = "172",
journal = "Dyes and Pigments",
issn = "0143-7208",
publisher = "Elsevier BV",
}