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Highly Luminescent Europium(III) Complexes in Solution and PMMA-Doped Films for Bright Red Electroluminescent Devices

Authors :
Zubair Ahmed
Rafael dos Santos Carvalho
Aline Magalhães dos Santos
Francesca Gambassi
Elisa Bandini
Lorenza Marvelli
Lucia Maini
Andrea Barbieri
Marco Cremona
Source :
Molecules, Vol 28, Iss 11, p 4371 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

This paper reports the synthesis, structure, photophysical, and optoelectronic properties of five eight-coordinate Europium(III) ternary complexes, namely, [Eu(hth)3(L)2], bearing 4,4,5,5,6,6,6-heptafluoro-1-(2-thienyl)-1,3-hexanedione (hth) as a sensitizer and L = H2O (1), dpso (diphenyl sulphoxide, 2), dpsoCH3 (4,4′-dimethyl diphenyl sulfoxide, 3), dpsoCl (bis(4-chlorophenyl)sulphoxide, 4), and tppo (triphenylphosphine oxide, 5) as co-ligands. 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 β-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—ITO/MoO3/mCP/SF3PO:[complex 5] (10%)/TPBi:[complex 5] (10%)/TmPyPB/LiF/Al—using complex 5 as the emitting component.

Details

Language :
English
ISSN :
14203049
Volume :
28
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Molecules
Publication Type :
Academic Journal
Accession number :
edsdoj.774f114dc9f4450b445abb86ae7e496
Document Type :
article
Full Text :
https://doi.org/10.3390/molecules28114371