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Fluorescent and cathodoluminescent phophors structurally related to sodalite

United States Patent

*** EXPIRED ***
September 29, 1998
View the Complete Patent at the US Patent & Trademark Office
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Blue, quantum-confined phosphors for field-emission displays made by reducing metal (M) sulfoaluminates at high temperature. This yields phases of the type M.sub.4 (AlO.sub.2).sub.6 S. Bulk sulfide contaminant mixed with the reduced sulfoaluminate phase is removed by treating it with a chelating agent in nonaqueous solution. A photometric cathodoluminescence efficiency of 9 lumen/watt at 1000 V for Sr.sub.3 PbS(AlO.sub.2).sub.6 is observed. Undoped Sr.sub.4 S(AlO).sub.6 displays 5 lumen/watt at 1000 V, with excellent blue chromatic saturation.
Phillips; Mark L. F. (Tijeras, NM), Shea; Lauren E. (San Diego, CA)
Sandia Corporation (Albuquerque, NM)
08/ 827,146
March 27, 1997
This invention was made with Government support under Contract No. DE-AC04-94AL85000 awarded by the United States Department of Energy. The Government has certain rights in the invention.