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Photoelectric Effect02:26

Photoelectric Effect

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...

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Updated: Jun 20, 2026

An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation
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An Integrated System to Remotely Trigger Intracellular Signal Transduction by Upconversion Nanoparticle-mediated Kinase Photoactivation

Published on: August 30, 2017

通过使用NIR光的远程控制的光开关.

Carl-Johan Carling1, John-Christopher Boyer, Neil R Branda

  • 14D LABS, Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A 1S6.

Journal of the American Chemical Society
|September 3, 2009
PubMed
概括
此摘要是机器生成的。

光子向上转换的纳米晶体使得使用近红外光对光开关的远程控制成为可能. 这一突破为3D数据存储,药物输送和光刻应用提供了新的可能性.

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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
  • 摄影化学的使用.

背景情况:

  • 光开关是分子,在暴露在光线下改变形状.
  • 使用近红外 (NIR) 光控制光开关是具有挑战性的,因为吸收率低.
  • 现有的NIR触发光交换方法是有限的.

研究的目的:

  • 展示一种使用NIR光远程控制光开关的新方法.
  • 为了利用光子向上转换纳米粒子进行波长转换.
  • 探索在3D数据存储,药物输送和光电法等领域的潜在应用.

主要方法:

  • 合成的六边形NaYF(4) 纳米晶体,添加了兰化离子.
  • 使用980nm NIR光激发纳米晶体.
  • 从NIR观察到波长转换以触发光开关异构体.
  • 研究了光开关切换的远程控制机制.

主要成果:

  • 通过光子上升转换成功实现了使用NIR光的光开关切换.
  • 证明了胺化NaYF(4) 纳米晶体可以将980nm光转化为可用的波长.
  • 确认了用于操纵光开关状态的"远程控制"功能.

结论:

  • 光子向上转换的纳米晶体为NIR触发的光开关控制提供了一个实用的方法.
  • 这项技术在3D数据存储和向药物输送等先进应用中具有显著的潜力.
  • 这些发现为各种科学和技术领域的精确光学控制开辟了新的途径.