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相关概念视频

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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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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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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

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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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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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通过兰化物向上转换产生紫外线光.

Leipeng Li1,2, Hao Suo1,2, Feng Wang1,3

  • 1Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, China.

Accounts of chemical research
|December 29, 2025
PubMed
概括
此摘要是机器生成的。

研究人员正在推进紫外线 (UV) 上转换材料,用于诸如太阳盲成像和灭菌等应用. 新的方法提高了兰化物合的晶体中的紫外线辐射强度,使其在照明和环境科学中具有新的用途.

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科学领域:

  • 非线性光学是一种非线性光学.
  • 材料科学是一种材料科学.
  • 光子学 是一个光子学.

背景情况:

  • 向上转换将长波长的光子转换为更短的波长,Yb3+-Ln3+对在可见光转换方面表现出色.
  • 在实现紫外线上升转换方面取得的进展有限,尽管它有太阳盲成像,灭菌和光疗的潜力.
  • 正在探索Er3+,Tm3+和Pr3+离子的紫外线发射,需要优化的兴奋剂,宿主和激发方案.

研究的目的:

  • 审查UV上转换材料的最新进展,重点是合兰化物无机晶体.
  • 突出提高紫外线向上转换发射强度的方法.
  • 讨论紫外线上转换在照明,成像和环境科学中的前沿应用.

主要方法:

  • 使用精选的剂离子 (Er3+,Tm3+,Pr3+) 和宿主晶体构建紫外线上转换材料.
  • 对兴奋剂度,宿主格子组成和激发方案的调查.
  • 通过介电合,等离子体调制和有机表面涂层增强紫外线上转换排放.

主要成果:

  • 开发基于Er3+,Tm3+和Pr3+的紫外线向上转换材料.
  • 展示方法,以显著提高紫外线向上转换的排放强度.
  • 探索太阳盲成像,灭菌和环境修复中的应用.

结论:

  • 通过合理的设计和增强策略,在UV上转换材料方面取得了重大进展.
  • 用兰化物合的无机晶体为深紫外线发射提供了有前途的平台.
  • 未来的研究应该专注于进一步优化这些材料的各种技术应用.