(12) United States Patent ao) Patent No.: us 6,726,992 Bi
Yadav et al. (45) Date of Patent: Apr. 27,2004
(54) NANO-ENGINEERED PHOSPHORS AND RELATED NANOTECHNOLOGY
(75) Inventors: Tapesh Yadav, Longmont, CO (US);
Karl Pfaffenbach, Boulder, CO (US)
(73) Assignee: NanoProducts Corporation,
Longmont, CO (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 10/464,208
(22) Filed: Jun. 18, 2003
Related U.S. Application Data
(62) Division of application No. 10/004,387, filed on Dec. 4, 2001, and a division of application No. 10/150,722, filed on May 17,2002, and a division of application No. 09/274,517, filed on Mar. 23, 1999, now Pat. No. 6,344,271.
(60) Provisional application No. 60/310,967, filed on Aug. 8, 2001, provisional application No. 60/111,442, filed on Dec. 8, 1998, and provisional application No. 60/107,318, filed on Nov. 6, 1998.
(51) Int. C I. B32B 5/16
(52) U.S. C I 428/403
(58) Field of Search 428/403
Dispersed phosphor powders are disclosed that comprise nanoscale powders dispersed on coarser carrier powders. The composition of the dispersed fine powders may be oxides, carbides, nitrides, borides, chalcogenides, metals, and alloys. Such powders are useful in various applications such as lamps, cathode ray tubes, field emission displays, plasma display panels, scintillators, X-ray detectors, IR detectors, UV detectors and laser detectors. Nano-dispersed phosphor powders can also be used in printing inks, or dispersed in plastics to prevent forgery and counterfeiting of currency, original works of art, passports, credit cards, bank checks, and other documents or products.
18 Claims, 6 Drawing Sheets