Issue 37, 2021

Identifying lifetime as one of the key parameters responsible for the low brightness of lanthanide-based OLEDs

Abstract

OLEDs based on lanthanide complexes have decisive optical advantages but are hampered by low brightness. Despite the efforts to optimize several parameters such as quantum yield and charge carrier mobility, there seems to be another key parameter that hinders their performances. Experimental data are therefore collected for mixed-ligand europium complexes with bathophenanthroline and different classes of anionic ligands and screened to identify the key parameter responsible for this situation, which turns out to be the long lifetime of their excited states. A broad literature search supports this conclusion, showing that lanthanide complexes are inferior to other classes of OLED emitters often because of their long lifetimes; furthermore, among a series of lanthanide complexes, the best results are achieved for those with the shortest lifetimes, even though they suffer from low quantum yields.

Graphical abstract: Identifying lifetime as one of the key parameters responsible for the low brightness of lanthanide-based OLEDs

Supplementary files

Article information

Article type
Communication
Submitted
08 Jul 2021
Accepted
08 Aug 2021
First published
09 Aug 2021

Dalton Trans., 2021,50, 12806-12813

Identifying lifetime as one of the key parameters responsible for the low brightness of lanthanide-based OLEDs

V. V. Utochnikova, A. N. Aslandukov, A. A. Vashchenko, A. S. Goloveshkin, A. A. Alexandrov, R. Grzibovskis and J. G. Bünzli, Dalton Trans., 2021, 50, 12806 DOI: 10.1039/D1DT02269E

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