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相关概念视频

Photoelectric Effect02:26

Photoelectric Effect

32.0K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
32.0K
Photoluminescence: Applications01:14

Photoluminescence: Applications

503
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
503

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相关实验视频

Updated: Sep 19, 2025

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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热响应的三态光子晶体

Yuewei Zheng1, Jinqing Chen1, Wanqi Mo1

  • 1Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|June 4, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了新的热敏光子晶体,用于先进的防伪. 这些动态材料表现出可调节的结构色彩,光和有机后照,用于安全的多模式信息存储.

关键词:
有机的光之后的光光子晶体是一种光子晶体.结构颜色 结构颜色热色彩的热色彩的三种模式的加密.

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 光子学 是一个光子学.

背景情况:

  • 假冒品构成了全球经济的重大威胁,现有的反假冒措施正在与复杂的假冒品作斗争.
  • 开发动态,多模式的防伪材料仍然是材料科学中的一个关键挑战.

研究的目的:

  • 为先进的防伪应用提供一种新的热响应三态光子晶体系统.
  • 通过实现动态,多模式的光学响应,克服当前防伪技术的局限性.

主要方法:

  • 制造涉及将有机合物纳入聚合物合物,并将热色微囊嵌入合物晶体中.
  • 该系统采用固相提取,并调节光散射/吸收以进行能量传输.
  • 采用了一种基于远场光吸收的新型能量传输机制,以保持后发光寿命.

主要成果:

  • 光子晶体在三个光学状态中表现出热色:光 (FL),光和结构色彩.
  • 开发的系统成功地将能量传输效率与光后寿命脱,这与传统方法相比是显著的改进.
  • 可调节的热色温度和多种有机允许创建多响应的防伪模式.

结论:

  • 展示的热响应三态光子晶体为动态,高容量和多式联通的防伪解决方案提供了一个有前途的平台.
  • 该战略推动了智能材料领域的发展,用于安全的信息存储和身份验证.
  • 这项研究为下一代防伪技术铺平了道路,这些技术具有增强的安全功能.