Su U Xu

US Patent:

6569952, May 27, 2003

Filed:

Sep 5, 2001

Appl. No.:

09/947192

Inventors:

Liaohai Chen - Argonne IL
Su Xu - Santa Clara CA
Duncan McBranch - Santa Fe NM
David Whitten - Santa Fe NM

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

C08F 830

US Classification:

5253271, 5253281, 5253328, 5253329, 5253331, 5253332, 5253593

Abstract:

The addition of oppositely charged surfactant to fluorescent ionic conjugated polymer forms a polymer-surfactant complex that exhibits at least one improved photophysical property. The conjugated polymer is a fluorescent ionic polymer that typically has at least one ionic side chain or moiety that interacts with the specific surfactant selected. The photophysical property improvements may include increased fluorescence quantum efficiency, wavelength-independent emission and absorption spectra, and more stable fluorescence decay kinetics. The complexation typically occurs in a solution of a polar solvent in which the polymer and surfactant are soluble, but it may also occur in a mixture of solvents. The solution is commonly prepared with a surfactant molecule:monomer repeat unit of polymer ratio ranging from about 1:100 to about 1:1. A polymer-surfactant complex precipitate is formed as the ratio approaches 1:1.

US Patent:

20020182388, Dec 5, 2002

Filed:

May 31, 2001

Appl. No.:

09/872218

Inventors:

Su Xu - Santa Clara CA, US
Duncan McBranch - Santa Fe NM, US

International Classification:

B32B007/02

US Classification:

428/212000

Abstract:

Optical limiting device and method of preparation thereof. The optical limiting device includes a transparent substrate and at least one homogeneous layer of an RSA material in polyvinylbutyral attached to the substrate. The device may be produced by preparing a solution of an RSA material, preferably a metallophthalocyanine complex, and a solution of polyvinylbutyral, and then mixing the two solutions together to remove air bubbles. The resulting solution is layered onto the substrate and the solvent is evaporated. The method can be used to produce a dual tandem optical limiting device.