Infrared phosphor and material having latent images and optical

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

1994-05-04

1997-03-18

Bonner, Melissa

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

250271, 428913, 428690, 235491, C09K 1170, C09K 1181, G06K 1914, B32B 3300

Patent

active

056119585

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.

REFERENCES:
patent: 4107273 (1978-08-01), Suzuki et al.
patent: 4149989 (1979-04-01), Kashiwada et al.
patent: 4202491 (1980-05-01), Suzuki
patent: 5220166 (1993-06-01), Takeuchi et al.

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