Phosphor thin film, preparation method, and EL panel
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United States of America Patent
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Feb 28, 2006
Grant Date -
Dec 19, 2002
app pub date -
Apr 19, 2002
filing date -
Apr 19, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A phosphor thin film is provided that has a high luminance, a satisfactory color purity sufficient to eliminate a need for filters, and a long luminance life. The phosphor thin film can be adapted to suit each element of red, green and blue in full color EL panels. The phosphor thin film includes a matrix material and a luminescent center. The matrix material is a sulfide containing at least an alkaline earth element, Ga and/or In, sulfur (S) and optionally, Al, or an oxysulfide further containing oxygen (O) in addition to the foregoing elements. Provided that A stands for the alkaline earth element and B stands for Ga, In and Al in the matrix material, the atomic ratio B/A is in the range: B/A=2.1 to 3.5.
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