公开(公告)号：US09382432B1

公开(公告)日：2016-07-05

申请号：US14860676

申请日：2015-09-21

Applicant: Hunter McDaniel

Inventor： Hunter McDaniel

IPC: C09D11/03 ,  C09D5/22 ,  G01N21/64 ,  C09D11/037

CPC classification number: C09D5/22 ,  B41M3/144 ,  C09D11/037 ,  C09D11/322 ,  C09D11/50 ,  G01N21/6408 ,  G01N21/643 ,  G01N21/6489 ,  G01N2201/061 ,  G01N2201/062 ,  G07D7/1205

Abstract: A security ink is provided which includes a liquid medium having a plurality of quantum dots disposed therein. Upon excitation with a suitable light source, the ink exhibits a quantum yield greater than 30%, and a photoluminescence which has a lifetime of more than 40 nanoseconds and which varies by at least 5% across the emission spectrum of the quantum dots. Also disclosed are apparatuses for using the same for anti-counterfeit or authentication purposes, which uniquely identifying the presence of photoluminescent materials by spectrally resolving their photoluminescence lifetime.

Abstract translation: 提供一种安全油墨，其包括其中设置有多个量子点的液体介质。 当用合适的光源激发时，油墨显示出大于30％的量子产率，以及寿命大于40纳秒并且在量子点的发射光谱上变化至少5％的光致发光。 还公开了将其用于防伪或认证目的的装置，其通过光谱解析其光致发光寿命来唯一地识别光致发光材料的存在。

公开(公告)号：US10170022B2

公开(公告)日：2019-01-01

申请号：US14736184

申请日：2015-06-10

Applicant: Hunter McDaniel

Inventor： Hunter McDaniel

IPC: B60Q7/00 ,  F21V7/00 ,  F21V9/30 ,  G09F13/04 ,  G09F13/16 ,  F21W111/10

Abstract: Common approaches to retroreflectors rely on absorptive materials that waste light energy that could be utilized for visibility. Disclosed photoluminescent retroreflectors filter reflected light, like traditional colored retroreflectors, but down-convert photons of the wrong color into a glow visible from more directions. The glow enables visibility for more observers or observers whose light source is far from their line of sight. The color of the glow can be adjusted by choice of luminescent material as a design feature or safety purpose. Certain embodiments utilize photoluminescent additives within a retroreflector while other embodiments utilize a photoluminescent coating on top of a pre-made retroreflector. An exemplary photoluminescent material for these optical devices is CuInZnS2 quantum dots.

公开(公告)号：US09964488B2

公开(公告)日：2018-05-08

申请号：US14860681

申请日：2015-09-21

Applicant: Hunter McDaniel

Inventor： Hunter McDaniel

IPC: G01N21/63

CPC classification number: G01N21/63 ,  G01N21/6408 ,  G01N21/6489 ,  G01N2021/6413

Abstract: 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.

公开(公告)号：US20170082542A1

公开(公告)日：2017-03-23

申请号：US14860681

申请日：2015-09-21

Applicant: Hunter McDaniel

Inventor： Hunter McDaniel

IPC: G01N21/63

CPC classification number: G01N21/63 ,  G01N21/6408 ,  G01N21/6489 ,  G01N2021/6413

Abstract: 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.

公开(公告)号：US20150279250A1

公开(公告)日：2015-10-01

申请号：US14736184

申请日：2015-06-10

Applicant: Hunter McDaniel

Inventor： Hunter McDaniel

IPC: G09F13/16 ,  F21V7/00 ,  B60Q7/00 ,  F21V9/16

CPC classification number: G09F13/16 ,  B60Q7/00 ,  F21V7/0008 ,  F21V9/30 ,  F21W2111/10 ,  G09F2013/0472

Abstract: Common approaches to retroreflectors rely on absorptive materials that waste light energy that could be utilized for visibility. Disclosed photoluminescent retroreflectors filter reflected light, like traditional colored retroreflectors, but down-convert photons of the wrong color into a glow visible from more directions. The glow enables visibility for more observers or observers whose light source is far from their line of sight. The color of the glow can be adjusted by choice of luminescent material as a design feature or safety purpose. Certain embodiments utilize photoluminescent additives within a retroreflector while other embodiments utilize a photoluminescent coating on top of a pre-made retroreflector. An exemplary photoluminescent material for these optical devices is CuInZnS2 quantum dots.

Abstract translation: 后向反射器的常见方法依赖于吸收材料，其可以浪费可用于可见度的光能。 公开的光致发光回射器过滤反射光，像传统的彩色后向反射器，但将错误颜色的光子下变换成从更多方向可见的发光。 辉光使更多的观察者或观察者能够看到光源远离视线。 可以通过选择发光材料作为设计特征或安全目的来调节辉光的颜色。 某些实施例在后向反射器中使用光致发光添加剂，而其它实施例在预制后向反射器的顶部使用光致发光涂层。 用于这些光学器件的示例性光致发光材料是CuInZnS2量子点。