Abstract
Electroluminescence complexes based on ytterbium and 5-methyl-2-phenyl-4-(2,2,2-trifluoroacetyl)-2,4-dihydro-3H-pyrazol-3-one (HL) ligand and various diimine-type ancillary ligands (2,2-bipyridine, bathophenanthroline, 1,10-phenanthroline) have been synthesized, and corresponding crystals were investigated. [Yb(L)3(bipy)] and [Yb(L)3(bath)] complexes have triclinic structure (P-1), while [Yb(L)3(phen)] complex has orthorhombic structure (P212121). The crystallography parameters were determined. The photoluminescence of the complexes demonstrated only bands resulted from \(^{2} F_{5/2}^{{}} \to^{2} F_{7/2}^{{}}\) transition and corresponding three Stark subcomponents generated due to the crystal field action. NIR-OLED structures with emitting layers based on the [Yb(L)3(bipy)], [Yb(L)3(bath)], and [Yb(L)3(phen)] complexes have been fabricated, and their electroluminescence demonstrated maxima intensities at 978 and 1005 nm. Comparison of NIR-OLEDs power density showed that the maximal power densities of 2.17 (978 nm) and 1.92 (1005 nm) μW × cm−2 were determined for the NIR-OLED based on [Yb(L)3(bath)] complex.
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The research was financially supported by Russian Science Foundation by the grant 19-79-10003. The authors acknowledge support from Lomonosov Moscow State University Program of Development for providing access to single X-ray diffraction equipment.
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Barkanov, A., Zakharova, A., Vlasova, T. et al. NIR-OLED structures based on lanthanide coordination compounds: synthesis and luminescent properties. J Mater Sci 57, 8393–8405 (2022). https://doi.org/10.1007/s10853-021-06721-4
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DOI: https://doi.org/10.1007/s10853-021-06721-4