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Updated: Jul 23, 2025
Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
The increase of europium-based OLED luminance through reducing the excited state lifetime by mixed-ligand complex
Makarii I Kozlov1, Andrey A Vashchenko2, Alexander A Pavlov3,4
1M. V. Lomonosov Moscow State University, 1/3 Leninskye Gory, Moscow, 119991, Russia. valentina.utochnikova@gmail.com.
Abstract:
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, 1H and 19F 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.
