Photoluminescent iron-doped barium stannate material, security ink composition and security feature thereof
US11352517B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Mar 20, 2018 |
| Grant date | Jun 7, 2022 |
| Priority date | — |
| Expiry date | Aug 13, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D2207/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides photoluminescent iron-doped barium stannate materials absorbing ultraviolet (UV) light and exhibiting strong near-infrared (NIR) luminescence. Such materials exhibit increased integrated photoluminescence intensity in comparison to known BaSnO3 and iron-doped barium stannate materials, and therefore they are particularly useful for the production of photoluminescent security ink compositions and transparent covert security features with improved anti-counterfeiting resistance that can be used for protection of documents and articles against counterfeit and illegal reproduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.