Infrared phosphor and material having latent images and...

Details Infrared phosphor and material having latent images and... Infrared phosphor and material having latent images and...

C - Chemistry, Metallurgy

09

K

C09K 11/77 (2006.01) C09K 11/08 (2006.01) C09K 11/78 (2006.01) C09K 11/81 (2006.01) G06K 7/12 (2006.01) G06K 9/18 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2123274

The invention provides a phosphor excited by infrared rays to emit infrared rays which has a particle shape of nonacicular and a particle size of 4 µm or smaller after synthesized. The phosphor preferably comprises an oxoacid salt-containing compound containing 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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