Authentication of quantum dot security inks

    公开(公告)号:US10724951B2

    公开(公告)日:2020-07-28

    申请号:US15943723

    申请日:2018-04-03

    申请人: UbiQD, Inc.

    发明人: Hunter McDaniel

    IPC分类号: G01N21/63 G01N21/64

    摘要: A method is provided for verifying the authenticity of an article which bears a security mark. The method includes irradiating the security mark with a time-varying light source, ascertaining at least one portion of the emissions spectrum of the irradiated security mark with at least one photodetector, determining the photoluminescence lifetime of the security mark by monitoring the time or frequency response of the photodetector, and verifying the authenticity of the article only if the security mark exhibits a photoluminescence which has a lifetime that falls within the range of appropriate values for each portion of the photoluminescence spectrum for which the photoluminescence lifetime of said security mark was ascertained.

    LUMINESCENT OPTICAL ELEMENTS FOR AGRICULTURAL APPLICATIONS

    公开(公告)号:US20200176625A1

    公开(公告)日:2020-06-04

    申请号:US16612344

    申请日:2018-05-09

    申请人: UbiQD, Inc.

    摘要: An optical element is provided which comprises a plurality of fluorophores disposed in a medium. The fluorophores have a quantum yield greater than 50% and an absorption spectrum with a maximum intensity at wavelengths less than 400 nm, and emit a spectrum of light having a maximum intensity at wavelengths within the range of 400 nm to 1200 nm. The optical element is at least partially transparent over the visible region of the spectrum. The optical element is especially useful as a window or other optical component of a greenhouse structure.

    Authentication of quantum dot security inks

    公开(公告)号:US11493444B2

    公开(公告)日:2022-11-08

    申请号:US16909842

    申请日:2020-06-23

    申请人: UbiQD, Inc.

    发明人: Hunter McDaniel

    IPC分类号: G01N21/63 G01N21/64

    摘要: A method is provided for verifying the authenticity of an article which bears a security mark. The method includes irradiating the security mark with a time-varying light source, ascertaining at least one portion of the emissions spectrum of the irradiated security mark with at least one photodetector, determining the photoluminescence lifetime of the security mark by monitoring the time or frequency response of the photodetector, and verifying the authenticity of the article only if the security mark exhibits a photoluminescence which has a lifetime that falls within the range of appropriate values for each portion of the photoluminescence spectrum for which the photoluminescence lifetime of said security mark was ascertained.

    AUTHENTICATION OF QUANTUM DOT SECURITY INKS
    10.
    发明申请

    公开(公告)号:US20200319105A1

    公开(公告)日:2020-10-08

    申请号:US16909842

    申请日:2020-06-23

    申请人: UbiQD, Inc.

    发明人: Hunter McDaniel

    IPC分类号: G01N21/63 G01N21/64

    摘要: A method is provided for verifying the authenticity of an article which bears a security mark. The method includes irradiating the security mark with a time-varying light source, ascertaining at least one portion of the emissions spectrum of the irradiated security mark with at least one photodetector, determining the photoluminescence lifetime of the security mark by monitoring the time or frequency response of the photodetector, and verifying the authenticity of the article only if the security mark exhibits a photoluminescence which has a lifetime that falls within the range of appropriate values for each portion of the photoluminescence spectrum for which the photoluminescence lifetime of said security mark was ascertained.