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相关概念视频

Photoluminescence: Fluorescence and Phosphorescence01:23

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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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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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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聚合物外接系统中的长时间持久发光:设计原理和最近的进展

Zikun Wang1, Yingchen Sheng1, Wei Hong1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, Key Laboratory For Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou, China.

Chemistry (Weinheim an der Bergstrasse, Germany)
|February 25, 2026
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概括

研究人员正在开发用于先进应用的长持续发光 (LPL) 聚合物. 这些材料提供延长后照,克服了传统有机后照化合物的局限性.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 有机电子 有机电子
  • 光物理学的光学物理学

背景情况:

  • 有机后照材料看起来很有前途,但通常具有短的发光寿命 (毫秒到秒).
  • 在纯有机系统中,在几个小时或几天内实现长时间持久发光 (LPL) 是一个重大挑战.
  • 最近的进展,特别是2017年以来的聚合物基LPL材料,已经显示出快速的进展.

研究的目的:

  • 系统地审查长期持久发光 (LPL) 聚合物的设计策略.
  • 总结LPL聚合物的当前应用.
  • 为了突出能量水平对齐和电荷分离在LPL性质的exciplex聚合物的重要性.

主要方法:

  • 关于有机后照和LPL材料的文献综述.
  • 对外聚合物中结构性质关系的分析.
  • 聚合物设计的最新进展的汇编,用于LPL.

主要成果:

  • 现在存在纯有机的LPL材料,寿命超过一个小时.
  • 基于聚合物的LPL材料经历了显著的发展,由量身定制的捐助者和接受者结构驱动.
  • 能量水平对齐和电荷分离是实现所需LPL属性的关键因素.

结论:

  • 经过精心设计的exciplex聚合物为实现长期持久发光提供了一个有希望的途径.
  • LPL聚合物正在在光学防伪,夜间照明和智能织品等领域推进应用.
  • 对有机供体-接受体结构的持续研究对于进一步提高LPL材料性能至关重要.