Zhi Wei Liu

US Patent:

7455565, Nov 25, 2008

Filed:

Mar 16, 2006

Appl. No.:

11/378133

Inventors:

Francisco Machuca - San Francisco CA, US
Zhi Liu - Palo Alto CA, US

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

H01J 9/04
H01J 9/02

US Classification:

445 51, 445 35, 134 19

Abstract:

Improved photocathodes are provided by a fabrication method including steps of wet chemically cleaning the photocathode emission surface (to reduce the level of cleaning-induced surface damage), two stage heat treatment (to complete the cleaning without desorbing nitrogen from the emission surface), followed by activation with Cs only, as opposed to Cs—O. The resulting photocathodes have improved performance (lifetime, brightness, efficiency) compared to conventional photocathodes, and are thus attractive candidates for demanding photocathode applications.

US Patent:

20110308605, Dec 22, 2011

Filed:

Jan 30, 2009

Appl. No.:

12/865390

Inventors:

Zhi Liu - Millbrae CA, US
Will Clay - Stanford CA, US
Michael A. Kelly - Portola Valley CA, US
Nicholas A. Melosh - Menlo Park CA, US
Andrey A. Fokin - Giessen, DE
Peter R. Schreiner - Wettenberg, DE

Assignee:

Justus-Liebig-Universitaet Giessen - Giessen
Leland J. Stanford Junior Univesity - Palo Alto CA

International Classification:

H01L 31/0216
C07C 13/615
H05B 33/14

US Classification:

136257, 313503, 585 22

Abstract:

Provided is a fluorescent diamondoid material which when energized, either by an electric field or by high energy radiation, emits light. The light emitted is generally in the visible range. The diamondoid material can be fine tuned by internal or external doping. The fluorescent materials comprised of diamondoids, have applications in several fields. One application is in solar cells where these materials can be used to improve the overall efficiency of the device. A second application is in indoor lighting where the materials can be used to efficiently produce white light. This can be done by either using the material as a fluorescent medium for a UV light source, in an electroluminescence device, or by using the material as part of an organic light emitting diode (OLED).