Candle light-style OLEDs with benzochalcogenadiazoles cores

Candle light-style OLEDs with benzochalcogenadiazoles cores Full article

Journal

Dyes and Pigments
ISSN: 1873-3743 , E-ISSN: 0143-7208

Output data

Year: 2021, Volume: 185, Article number : 108917, Pages count : DOI: 10.1016/j.dyepig.2020.108917

Authors

Korshunov Vladislav M. ^1,2 , Chmovzh Timofey N. ^3,4 , Golovanov Ivan S. ³ , Knyazeva Ekaterina A. ³ , Mikhalchenko Lyudmila V. ³ , Saifutyarov Rasim S. ⁵ , Avetisov Igor C. ⁶ , Woollins J.Derek ⁷ , Taydakov Ilya V. ² , Rakitin Oleg A. ^3,4

Affiliations

1	Bauman Moscow State Technical University, 2-ya Baumanskaya Str. 5/1, 105005 Moscow, Russia
2	P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy Prospect, 119991 Moscow, Russia
3	N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect, 119991 Moscow, Russia
4	Nanotechnology Education and Research Center, South Ural State University, 454080 Chelyabinsk, Russia
5	A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, Vavilova St. 28, 119991 Moscow, Russia
6	D. I. Mendeleev University of Chemical Technology of Russia, Miusskaya Pl. 9, 124047 Moscow, Russia
7	EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST Fife, UK

Fluorescent D-A1-π-A2 dyes containing the 9-hexyl-9H-carbazole electron-donor unit and 2,1,3-benzochalcogenadiazoles as electron-withdrawing, were synthesized. These dyes displayed high luminescence quantum yields up to 20% in the solid phase and 80% in solutions. A series of ClsOLEDs with high luminance up to 6256 cd/m2 and low color temperature (1800–1900 K) based on these dyes were constructed. The electroluminescence color temperature of the fabricated OLEDs is independent of the operating voltage making these compounds potentially very useful for night time illumination. It was shown that the aggregation process of the investigated dyes led to the formation of planar crystalline structures. Scanning electron microscopy (SEM) and fluorescence lifetime imaging (FLIM) experiments, showed that luminescence quenching caused by interactions between aggregates of different sizes takes place. Spectroscopic studies were supported by Density Functional Theory (DFT) and Time Dependent Density Functional Theory (TD-DFT) calculations. As a result, we elucidated that replacement of [1,2,5]chalcogenadiazolo[3,4-c]pyridines by 2,1,3-benzochalcogenadiazoles led to a substantial improvement in intramolecular charge transfer (ICT) from the donor to acceptor units due to favourable distortion of the excited state geometry.

Korshunov V.M. , Chmovzh T.N. , Golovanov I.S. , Knyazeva E.A. , Mikhalchenko L.V. , Saifutyarov R.S. , Avetisov I.C. , Woollins J.D. , Taydakov I.V. , Rakitin O.A.
Candle light-style OLEDs with benzochalcogenadiazoles cores
Dyes and Pigments. 2021. V.185. 108917 . DOI: 10.1016/j.dyepig.2020.108917 WOS Scopus OpenAlex

Web of science:	WOS:000600371800003
Scopus:	2-s2.0-85092237663
OpenAlex:	W3092009351

DB	Citing
OpenAlex	25
Scopus	24
Web of science	23