The increase of europium-based OLED luminance through reducing the excited state lifetime by mixed-ligand complex formation
Literature Information
Makarii I. Kozlov, Andrey A. Vashchenko, Alexander S. Goloveshkin, Egor V. Latipov, Natalia P. Kuzmina, Valentina V. Utochnikova
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.
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