Nanometer-sized up-converting phosphor fluoride particles and process of preparation

US7422703B2 · kind B2 · utility

Assignee

• CapitalBiochip Corporation · CN

Inventors

• Guangshun Yi · Beijing, CN
• Baoquan Sun · Damaishan, CN
• Depu Chen · Beijing, CN
• Yuxiang Zhou · Beijing, CN
• Jing Cheng · Shanghai, CN
• Wenjun Yang · Chengdu, CN
• Yue Ge · Beijing, CN
• Lianghong Guo · Beijing, CN

Key dates

• Filing date: Apr 15, 2003
• Grant date: Sep 9, 2008
• Expiry date: Mar 9, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S977/834
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Nanometer-scaled up-converting fluoride phosphor particles and processes of making them are disclosed. In the process, an aqueous solution consisting of soluble salts of rare-earth metal ions at a molar ratio of (yttrium, lanthanum or gadolinium): ytterbium:(erbium, holmium, terbium or thulium)=(70-90):(0-29):(0.001-15) is mixed a rare-earth metal chelator and a soluble fluoride salt to form precipitates, which are then annealed at an elevated temperature to produce nanometer-scaled up-converting fluoride phosphor particles. The particle size is between 35 nm and 200 nm, and can be controlled by the amount of the metal chelator added to the solution. The nanometer-sized particle is applicable to many biological assays.