Cooperative Sensitization Upconversion in Solution Dispersions of Co-Crystal Assemblies of Mononuclear Yb3+ and Eu3+ Complexes.
Angew Chem Int Ed Engl
; 62(24): e202304591, 2023 Jun 12.
Article
em En
| MEDLINE
| ID: mdl-37040148
ABSTRACT
Lanthanide upconversion luminescence in nanoparticles has prompted continuous breakthroughs in information storage, temperature sensing, and biomedical applications, among others. Achieving upconversion luminescence at the molecular scale is still a critical challenge in modern chemistry. In this work, we explored the upconversion luminescence of solution dispersions of co-crystals composed of discrete mononuclear Yb(DBM)3 Bpy and Eu(DBM)3 Bpy complexes (DBM dibenzoylmethane, Bpy 2,2'-bipyridine). The 613â
nm emission of Eu3+ was observed under excitation of Yb3+ at 980â
nm. From the series of molecular assemblies studied, the most intense luminescence was obtained for a 1 1 molar ratio of Yb3+ Eu3+ , resulting in a high quantum yield of 0.67 % at 2.1â
W cm-2 . The structure and energy transfer mechanism of the assemblies were fully characterized. This is the first example of an Eu3+ -based upconverting system composed of two discrete mononuclear lanthanide complexes present as co-crystals in non-deuterated solution.
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MEDLINE
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2023
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Article