Fluorescent substance, fluorescent composition, fluorescent mark carrier and optical reader thereof
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United States of America Patent
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Aug 3, 1999
Grant Date -
N/A
app pub date -
Nov 17, 1995
filing date -
Mar 17, 1994
priority date (Note) -
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Abstract
A fluorescent substance of the following general formula: Ln.sub.X A.sub.1-X PO.sub.4 wherein Ln represents at least one element selected from the group consisting of Nd, Yb and Er; A represents at least one element selected from the group consisting of Y, La, Gd, Bi, Ce, Lu, In and Tb; and X represents a value within the range of 0.01 to 0.99.
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