Abstract: The present invention relates to a nanostructured phosphorescent pigment comprising an Al2O3 substrate; MAl2O4:X nanocrystals, where M is a cation selected from Ca2+, Sr2+, Ba2+, Mg2+, Zn3+ and combinations thereof and where X is a cation selected from Eu3+, Dy3+, Nd3+, Er3+, La3+, Lu3+, Ce3+, Y3+, Gd3+, Tb3+, Tm3+, Yb3+ and combinations thereof, disposed on the Al2O3 substrate; and nanocrystals of molten salt disposed on the MAl2O4:X nanocrystals. Additionally, the invention relates to a method for preparing the nanostructured phosphorescent pigment of the invention comprising the steps of i) mixing starting materials comprising a cation M precursor, a cation X precursor, Al2O3 and a molten salt; ii) heating the mixture resulting from step (i) in reducing atmosphere.
Type:
Grant
Filed:
June 17, 2016
Date of Patent:
January 26, 2021
Assignees:
CONSEJO SUPERIOR DE INVESTIGACIONES CIENTÍFICAS, FÁBRICA NACIONAL DE MONEDA Y TIMBRE—REAL CASA DE LA MONEDA
Inventors:
José Francisco Fernández Lozano, Rocío Estefanía Rojas Hernández, Esther Enríquez Pérez, Fernando Rubio Marcos, Vicente García Juez, Lara Antón Ibáñez
Abstract: The present invention relates to the use of nanosystems as non deactivable security markers comprising metal atomic quantum clusters (AQCs) of at least two different size distributions encapsulated in a cavity with an inner diameter less than or equal to approximately 10 nm. These nanosystems are luminescence, particularly fluorescence after external excitation. The invention also relates to security documents, articles or elements incorporating these markers as well as to a method and a system for detecting the same.
Type:
Grant
Filed:
June 14, 2012
Date of Patent:
August 1, 2017
Assignees:
FABRICA NACIONAL DE MONEDA Y TIMBRE—REAL CASA DE LA MONEDA, NANOGAP SUB-NM POWDER, SOCIEDAD ANONIMA
Inventors:
Manuel Arturo Lopez Quintela, Vicente Garcia Juez
Abstract: The present invention relates to the use of nanocompounds as non deactivable security markers comprising a charge-transfer complex of at least two different size metal atomic quantum clusters (AQCs). These nanocompounds are luminescent, particularly fluorescent after external excitation. The invention also relates to security documents, articles or elements incorporating these markers as well as to a method and a system for detecting the same.
Type:
Grant
Filed:
December 11, 2013
Date of Patent:
April 5, 2016
Assignees:
FABRICA NACIONAL DE MONEDA Y TIMBRE—REAL CASA DE LA MONEDA, NANOGAP SUB-NM POWDER, SOCIEDAD ANONIMA
Inventors:
Manuel Arturo Lopez Quintela, Vicente Garcia Juez
Abstract: The present invention relates to a new family of luminescent pigments consisting of a salt of two ruthenium(II) complex ions of opposite sign charges comprising N-chelating heterocyclic ligands and to their use in security applications to prevent counterfeiting. The invention also refers to ink compositions and to the security documents or secured goods comprising said luminescent pigments.
Type:
Grant
Filed:
February 10, 2012
Date of Patent:
March 24, 2015
Assignee:
Fábrica Nacional de Moneda y Timbre—Real Casa de la Moneda
Inventors:
Guillermo Orellana Moraleda, David García Fresnadillo, Paloma Varela García De Oteyza, Javier Gamo Aranda, José Miguel Silván Pobes, Fernando Álvarez Martínez, Andrés Ruiz Quevedo