Solution-Processed OLED Based on a Mixed-Ligand Europium Complex

Makarii I Kozlov; Kirill M Kuznetsov; Alexander S Goloveshkin; Andrei Burlakin; Maria Sandzhieva; Sergey V Makarov; Elena Ilina; Valentina V Utochnikova

doi:10.3390/ma16030959

Solution-Processed OLED Based on a Mixed-Ligand Europium Complex

Materials (Basel). 2023 Jan 19;16(3):959. doi: 10.3390/ma16030959.

Authors

Makarii I Kozlov^{1

2}, Kirill M Kuznetsov², Alexander S Goloveshkin³, Andrei Burlakin⁴, Maria Sandzhieva⁴, Sergey V Makarov^{4

5}, Elena Ilina⁶, Valentina V Utochnikova^{1

2}

Affiliations

¹ Department of Chemistry, M.V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia.
² Department of Material Sciences, M.V. Lomonosov Moscow State University, 1/3 Leninskie Gory, 119991 Moscow, Russia.
³ A. N. Nesmeyanov Institute of Organoelement Compounds, Vavilova St. 28, 119334 Moscow, Russia.
⁴ School of Physics and Engineering, ITMO University, Lomonosova 9, 197101 St. Petersburg, Russia.
⁵ Qingdao Innovation and Development Center, Harbin Engineering University, Qingdao 266000, China.
⁶ Institute of Chemistry and Chemical-Pharmaceutical Technologies, Altai State University, Prospekt Lenina 61, 656049 Barnaul, Russia.

Abstract

An approach to increase the efficiency of europium-based OLEDs was proposed through the formation of a mixed-ligand complex. The design of a series of europium complexes, together with an optimization of the solution deposition, including the host selection, as well as the variation of the solvent and deposition parameters, resulted in a noticeable increase in OLED luminance. As a result, the maximum luminance of the Eu-based OLED reached up to 700 cd/m², which is one of the highest values for an Eu-based solution-processed OLED. Finally, its stability was investigated.

Keywords: OLED; electroluminescence; europium; lifetime; mixed-ligand complex.

Grants and funding

20-73-10053/Russian Science Foundation