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

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 spectrosco...

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Bibliographic Details
Published inPhysical chemistry chemical physics : PCCP Vol. 25; no. 29; pp. 242 - 248
Main Authors Kozlov, Makarii I, Vashchenko, Andrey A, Pavlov, Alexander A, Goloveshkin, Alexander S, Latipov, Egor V, Kuzmina, Natalia P, Utochnikova, Valentina V
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 26.07.2023
Subjects
Complex formation
Europium
Excitation
Ligands
Luminance
NMR spectroscopy
X ray powder diffraction
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Summary: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. Mixed-ligand europium complex formation resulted in a significant luminance increase due to the reduction of the lifetime of the excited state.
Bibliography:https://doi.org/10.1039/d3cp02082g
Electronic supplementary information (ESI) available: Synthesis and experimental methods, PXRD, TGA, IR- and NMR- spectroscopy data. See DOI
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ISSN:1463-9076
1463-9084
1463-9084
DOI:10.1039/d3cp02082g