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相关概念视频

Photoluminescence: Applications01:14

Photoluminescence: Applications

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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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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.
A pair of electrons in a...
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Variables Affecting Phosphorescence and Fluorescence01:26

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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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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Deactivation Processes: Jablonski Diagram01:25

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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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相关实验视频

Updated: Jun 4, 2025

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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红色室温光源从利格宁.

Hongda Guo1,2, Huanjie Cheng3, Ruixia Liu1,2

  • 1Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, P. R. China.

Angewandte Chemie (International ed. in English)
|December 24, 2024
PubMed
概括

可持续的红色室温光 (RTP) 材料是用红素制成的. 修改的素 (Lig-Upy) 呈现可调节的红色RTP,可用于防伪和视觉显示.

关键词:
在Lignin的基础上.多重的键是多重的键.红色 RTP 材料对于TDPCs来说,这是一个很好的选择.

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Label-free in situ Imaging of Lignification in Plant Cell Walls
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Label-free in situ Imaging of Lignification in Plant Cell Walls
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科学领域:

  • 材料科学 材料科学 材料科学
  • 有机化学 有机化学
  • 可持续化学 可持续化学

背景情况:

  • 从可持续来源开发红色室温光材料 (RTP) 是一个重大挑战.
  • 作为一种可再生生物聚合物,红具有潜力,但需要功能化以获得先进的光学特性.

研究的目的:

  • 为了从素中合成新的红色RTP材料.
  • 为了研究化学修饰对素光特性的影响.
  • 探索这些材料在防伪等应用中的潜力.

主要方法:

  • 素与Upy (1-(6-isocyanatohexyl) -3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl) 尿素的共价性修饰) 产生Lig-Upy.
  • 描述Lig-Upy的光物理特性,包括RTP发射波长和寿命.
  • 将Lig-Upy嵌入到不同的矩阵 (PVA,MTM) 中,以研究矩阵依赖性属性变化.

主要成果:

  • Lig-Upy显示红色RTP的中心在625nm,寿命长24.2 ms.
  • 该Upy修改增强了分子间相互作用,并减少了素中的能量差距.
  • 将Lig-Upy嵌入PVA和MTM矩阵导致可调节的RTP波长和寿命.
  • 从Lig-Upy.py开发了依赖时间的光色 (TDPC) 材料.

结论:

  • 素可以有效地功能化,以生产可持续的红色RTP材料.
  • 在Lig-Upy的可调节光开辟了先进的光学应用的道路.
  • 来自Lig-Upy的TDPC材料在视觉装饰,信息加密和防伪方面表现有前途.