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Photoluminescence: Applications01:14

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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...
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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在有机-无机接口上的光子上转换.

Zhiyuan Huang1, Tsumugi Miyashita2, Ming Lee Tang3

  • 1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, People's Republic of China;

Annual review of physical chemistry
|February 21, 2024
PubMed
概括

光子向上转换使用半导体量子点 (QD) 来将低能光子转换为高能光子. 这种有机QD平台增强了太阳能转换,并使先进的生物医学成像应用成为可能.

关键词:
黑暗的激发激发的激发有机-无机界面接口一个量子点,一个量子点.三重的能量转移是三重的.三倍三倍的消灭,三倍的毁灭.上升转换是一种上升转换.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 摄影化学的使用.
  • 纳米技术纳米技术

背景情况:

  • 光子上升转换将低能光子转换为高能光子.
  • 半导体量子点 (QD) 具有很高的光吸收能力,特别是在近红外 (NIR) 频谱中.
  • 应用包括光伏,光催化和生物成像.

研究的目的:

  • 审查有机-QD升级转换平台的发展.
  • 专注于涉及QD中的暗刺激子的三倍三倍灭绝机制.
  • 概述设计原则,以提高升级转换效率.

主要方法:

  • 对能量转移步骤的审查:QD三倍光敏化,激子运输和三倍三倍灭绝.
  • 对具有三重性质的QD中暗激子的分析.
  • 讨论设计策略,以提高转换效率.

主要成果:

  • 详细解释基于三倍三倍灭绝的有机-QD上转换过程.
  • 确定关键的能量转移步骤及其优化.
  • 为高效的升级改造提供设计原则的介绍.

结论:

  • 有机QD平台对于光子上转换是有效的.
  • 进一步的研究可以克服当前的局限性,并打开新的应用.
  • 本次审查是为开发高效的升级转换系统提供指南.