Small D-π-A-π-D organic dyes for near-infrared emitting OLEDs with excellent external quantum efficiency

Small D-π-A-π-D organic dyes for near-infrared emitting OLEDs with excellent external quantum efficiency Full article

Journal

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

Output data

Year: 2023, Volume: 208, Article number : 110860, Pages count : 10 DOI: 10.1016/j.dyepig.2022.110860

Authors

Korshunov Vladislav M. ¹ , Chmovzh Timofey N. ^2,3 , Freidzon Alexandra Ya ⁴ , Minyaev Mikhail E. ² , Barkanov Artem D. ⁵ , Golovanov Ivan S. ² , Mikhalchenko Lyudmila V. ² , Avetisov Igor C. ⁵ , Taydakov Ilya V. ¹ , Rakitin Oleg A. ²

Affiliations

1	P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy Prospect, 119991, Moscow, Russia
2	N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect, 47, Moscow, 119991, Russia
3	Nanotechnology Education and Research Center, South Ural State University, 454080 Chelyabinsk, Russia
4	Photochemistry Center of RAS, FSRC “Crystallography and Photonics”, Russian Academy of Sciences, Novatorov str. 7A-1, Moscow, 119421, Russia
5	D. I. Mendeleev University of Chemical Technology of Russia, Miusskaya Pl. 9, 124047, Moscow, Russia

Organic-light emitting diodes (OLEDs) with near-infrared (NIR) emission have an extremely broad range of attractive applications. Compounds containing donor (D) and acceptor (A) fragments are promising materials for use as active emitting layer in OLEDs due to their fast luminescence and because their luminescence properties can be fine-tuned at the synthesis stage. In this work, we synthesized and investigated two D-π-A-π-D NIR-emitting dyes based on a new pyridazine-thiadiazole electron acceptor with two different π linkers. The introduction of π linkers, together with the geometry modification, provides an additional redshift of the emission maximum from 700 to 850 nm. These dyes demonstrate moderate quantum yields up to 15% in chloroform solutions and to 4% in the solid state. Spectroscopic studies were supported by Time Dependent Density Functional Theory (TD-DFT) and multireference (XMCQDPT/CASSCF) calculations. A series of OLEDs with electroluminescence at 700 and 850 nm was fabricated. One of the devices exhibited maximum optical ower 76 μW/cm2 and maximum external quantum efficiency (EQE) 1.2%, which is close to the theoretical limit calculated for fluorescent NIR OLEDs based on low band gap small organic molecules.

Korshunov V.M. , Chmovzh T.N. , Freidzon A.Y. , Minyaev M.E. , Barkanov A.D. , Golovanov I.S. , Mikhalchenko L.V. , Avetisov I.C. , Taydakov I.V. , Rakitin O.A.
Small D-π-A-π-D organic dyes for near-infrared emitting OLEDs with excellent external quantum efficiency
Dyes and Pigments. 2023. V.208. 110860 :1-10. DOI: 10.1016/j.dyepig.2022.110860 WOS Scopus OpenAlex

Web of science:	WOS:000880152300007
Scopus:	2-s2.0-85140960840
OpenAlex:	W4307113579

DB	Citing
OpenAlex	19
Scopus	22
Web of science	20