Eu(II) complexes have been widely investigated in organic light-emitting diodes (OLEDs), magnetic resonance imaging and photoredox catalysis due to their unique photophysical and electrochemical properties. To favor their further applications,...
Luminescent Eu(II) complexes with characteristic d–f transitions have potential applications in many fields, especially organic light‐emitting diodes (OLEDs), due to their satisfactory advantages including short excited‐state lifetimes, 100% theoretical exciton utilization efficiency and tunable emission colors. Up to now, most light‐emitting layers in OLEDs are typically fabricated through high‐vacuum thermal evaporation process, which is uneconomical for large‐area and multi‐dopant devices. In this work, eight Eu(II) complexes with substituted tris(2‐aminoethyl)amine or triethanolamine ligands are designed and synthesized, and their structural and photophysical properties are studied. These complexes exhibit tunable maximum emission wavelengths in the range of 437–553 nm and high photoluminescence quantum yields up to 75%. Furthermore, this work demonstrates the application of Eu(II) complex in solution‐processed OLEDs with high efficiency and luminance for the first time. The optimized device show a maximum external quantum efficiency of 9.2% and a maximum luminance of 1780 cd m−2 with an emission peak at 485 nm.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.