The increase of europium-based OLED luminance through reducing the excited state lifetime by mixed-ligand complex formation.

Autor: Kozlov MI; M. V. Lomonosov Moscow State University, 1/3 Leninskye Gory, Moscow, 119991, Russia. valentina.utochnikova@gmail.com., Vashchenko AA; P. N. Lebedev Physical Institute, Leninsky prosp. 53, Moscow, 119992, Russia., Pavlov AA; A. N. Nesmeyanov Institute of Organoelement Compounds, Vavilova St. 28, Moscow, 119334, Russia.; BMSTU Center of National Technological Initiative 'Digital Material Science: New Material and Substances', Bauman Moscow State Technical University, 2nd Baumanskaya st. 5, Moscow, Russia., Goloveshkin AS; A. N. Nesmeyanov Institute of Organoelement Compounds, Vavilova St. 28, Moscow, 119334, Russia., Latipov EV; Institute of Nanotechnology of Microelectronics of the Russian Academy of Sciences, Leninsky Prospect 32A, Moscow, 119334, Russia., Kuzmina NP; M. V. Lomonosov Moscow State University, 1/3 Leninskye Gory, Moscow, 119991, Russia. valentina.utochnikova@gmail.com., Utochnikova VV; M. V. Lomonosov Moscow State University, 1/3 Leninskye Gory, Moscow, 119991, Russia. valentina.utochnikova@gmail.com.
Jazyk: angličtina
Zdroj: Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2023 Jul 26; Vol. 25 (29), pp. 20042-20048. Date of Electronic Publication: 2023 Jul 26.
DOI: 10.1039/d3cp02082g
Abstrakt: An approach to the luminance increase of the europium-based OLED is proposed through the formation of the mixed-ligand complex. The introduction of two diverse anionic ligands around one europium ion forming a mixed-ligand complex is confirmed by powder X-ray diffraction, 1 H and 19 F NMR spectroscopy, MALDI MS spectroscopy, and luminescence spectroscopy. A decrease in the symmetry of the coordination environment leads to a 50% reduction of the lifetime of the excited state. The obtained OLEDs based on mixed ligand europium complexes are significantly superior in luminance to OLEDs based on individual complexes.
Databáze: MEDLINE
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