A Method for Gold Coating of Rare Earth Nano-Phosphors and Uses Thereof
The particles provide two levels of security – visible color and a response to invisible infra-red light. Additional levels of security can be encoded in the form of shape of the particles, size of the particles and use of different wavelengths to tune the response of the particle to invisible light. Requires the use of low-powered lasers, hand held laser sources or light emitting diodes (LEDs). Using various possibilities of coding, more information can be encoded per square area than that exists today. The particles prevent damage to the biological molecules and reduces background signal due to any background fluorescence. The particles do not photo-bleach, thus improving the sensitivity and reliability of the data.
Researchers at the University of California, Davis have developed novel core-shell architecture nanoparticles that consist of a gold shell and a phosphor core. These particles are developed using a simple, robust one pot water based technique to coat gold on rare-earth fluoride containing nanometer sized phosphors. The uncoated phosphors are white, while the gold coated phosphors have distinct reddish tints that arise from the surface plasmon resonance of the gold shell. The tunable visible color together with the phosphor emission offers numerous possible applications.
Patent Number: US20120286203A1
Application Number: US13516421A
Inventor: Kennedy, Ian M. | Lakshmana, Sudheendra
Priority Date: 16 Dec 2009
Priority Number: US20120286203A1
Application Date: 15 Jun 2012
Publication Date: 15 Nov 2012
IPC Current: C09K001102 | C09K001177 | C09K001185 | B82Y003000 | B82Y004000
US Class: 25230140H | 2523014H | 25230140R | 977773 | 977810 | 977896 | 2523014R
Assignee Applicant: The Regents of the University of California
Title: GOLD COATING OF RARE EARTH NANO-PHOSPHORS AND USES THEREOF
Usefulness: GOLD COATING OF RARE EARTH NANO-PHOSPHORS AND USES THEREOF
Summary: For making security paper (claimed) such as currency, stock certificates, birth certificates, checks, academic certificates, passports, titles to property, lottery tickets, and legal documents.
Novelty: Nanoparticle useful for making security paper such as currency, stock certificates, checks and legal documents, comprises phosphorescent core and metal shell
紡織/服裝
織品工程
9034204
ABSTRACT A robust one pot method for coating gold on to an upconverting phosphor. Applications The gold shell and phosphor core nanoparticles are environmentally stable due to the gold shell and are biocompatible. The phosphor core can be doped with many lanthanides to provide a high degree of multiplexed labeling in conjunction with the visible color. These materials can potentially be used for multiple applications. For example such particles can serve as the state-of-the art, anti-counterfeiting markers, as biological markers with an open platform to tag cells, DNA, protein and tissues, as sensors for measuring temperatures in small volumes and areas for example microfluidic devices and as thermal energy dosimeters for cancer therapy based on hyperthermia. Tech ID/UC Case 20584/2010-181-0 Related Cases 2010-181-0
美國
