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US 12,122,950 B2Granted
Fluorescent rare earth complex and security medium using the same
AssigneesKabushiki Kaisha Toshiba, Toshiba Infrastructure Systems & Solutions Corporation
InventorsHiroki Iwanaga, Kenji Miyazaki
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Abstract
The embodiments provide a fluorescent rare earth complex having strong emission intensity and excellent durability, and also provide a security medium using the complex. The rare earth complex according to the embodiment comprises a rare earth ion, a diphosphine dioxide ligand and a β-diketone ligand wherein two phosphorus atoms contained in the diphosphine dioxide ligand individually have substituents different from each other.
Claims11
A rare earth complex, represented by the following formula (1):
- wherein:
- each Ar is independently an aryl group,
- each R is independently an alkyl group having 6 to 10 carbon atoms,
- each RF is independently a halogenated hydrocarbon group,
- n is an integer of 3 to 5,
- p is an integer of 1 or 2,
- q is an integer of 1 to 3,
- M is a europium (III) ion, and
- X is absent when q is 3 but is an anion having a valence of 3-q when q is 1 or 2.
6 more elements
Dependencies are inferred from the claim text.