Long persistent phosphors and persistent energy transfer technique

US6953536B2 · kind B2 · utility

Assignee

• University of Georgia Research Foundation, Inc. · US

Inventors

• William M. Yen · Athens, US
• Dongdong Jia · Troy, US
• Weiyi Jia · Chelmsford, US
• Xiao Wang · Zürich, CH

Key dates

• Filing date: Feb 25, 2003
• Grant date: Oct 11, 2005
• Expiry date: Mar 13, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/6582
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention provides long-persistent phosphors, methods for their manufacture and phosphorescent articles. The invention also provides a method for generating a long-persistent phosphorescence at a selected color. The phosphors of the invention may be alkaline earth aluminates, alkaline earth silicates, and alkaline earth aluminosilicates. The phosphors include those activated by cerium. The phosphors also include those in which persistent energy transfer occurs from a donor ion to an acceptor ion, producing persistent emission largely characteristic of the acceptor ion.