| 摘要 |
An ultraviolet luminescent ink is printed to form a pattern containing uniformly dispersed quantum dots without aggregation. In addition, the ultraviolet luminescent ink is transparent under natural light, so that the pattern is not visually observed, but emits light only upon UV irradiation. Therefore, the ultraviolet luminescent ink is useful in introducing codes in security articles, such as passports and bank bills. The ultraviolet luminescent ink can be used in the manufacture of security articles, such as passports, securities, bank bills, identification cards and credit cards. A security system using the ultraviolet luminescent ink is also disclosed.
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