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The NMR and the crystal structure analysis confirmed the eight-coordinate structures of the complexes in solution and in a solid state. Upon UV-excitation on the absorption band of the \u03b2-diketonate ligand hth, all complexes showed the characteristic bright red luminescence of the Europium ion. The tppo derivative (5) displayed the highest quantum yield (up to 66%). As a result, an organic light-emitting device, OLED, was fabricated with a multi-layered structure\u2014ITO\/MoO3\/mCP\/SF3PO:[complex 5] (10%)\/TPBi:[complex 5] (10%)\/TmPyPB\/LiF\/Al\u2014using complex 5 as the emitting component.<\/jats:p>","DOI":"10.3390\/molecules28114371","type":"journal-article","created":{"date-parts":[[2023,5,27]],"date-time":"2023-05-27T16:17:33Z","timestamp":1685204253000},"page":"4371","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Highly Luminescent Europium(III) Complexes in Solution and PMMA-Doped Films for Bright Red Electroluminescent Devices"],"prefix":"10.3390","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7322-1416","authenticated-orcid":false,"given":"Zubair","family":"Ahmed","sequence":"first","affiliation":[{"name":"Istituto per la Sintesi Organica e la Fotoreattivit\u00e0 (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via P. 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