Infrared phosphor and material having latent images and optical reading system using said phosphor
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United States of America Patent
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Mar 18, 1997
Grant Date -
N/A
app pub date -
May 4, 1994
filing date -
May 11, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
The invention provides a phosphor excited by infrared rays to emit infrared rays which has a nonacicular particle shape and a particle size of 4 .mu.m or smaller after being synthesized. The phosphor preferably comprises an oxoacid salt-containing compound including at least one element selected from the group consisting of Nd, Yb and Er. The invention further provides a material having a latent image pattern comprising said phosphor and an optical reading system which use the material having a latent image pattern.
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