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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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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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Photoactive Luminescence in a Silver Cluster Crystal.

Jia-Yin Wang1,2, Ying-Ying Lei1, Jia-Wang Yuan1

  • 1Henan Key Laboratory of Crystalline Molecular Functional Materials, Key Laboratory of Special Functional Molecular Materials, Ministry of Education, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.

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|December 13, 2025
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Researchers developed a novel photo-responsive silver cluster (Ag8) that switches luminescence "on" with UV light. This discovery enables new stimuli-responsive materials and a unique 3D printing ink.

Keywords:
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Area of Science:

  • Materials Science
  • Photochemistry
  • Nanotechnology

Background:

  • Coinage metal clusters are promising luminescent materials for optical sensors and LEDs.
  • Recent advances include clusters with afterglow, circularly polarized, near-infrared, and X-ray excited luminescence.
  • Luminescent metal clusters offer tunable electronic properties and precise atomic structures.

Purpose of the Study:

  • To report the first photo-responsive luminescent silver cluster (Ag8).
  • To investigate the mechanism behind the photo-induced luminescence.
  • To develop a novel stimuli-responsive material for 3D printing applications.

Main Methods:

  • Synthesis and characterization of the silver cluster (Ag8).
  • Photophysical measurements to study luminescence properties under UV irradiation.
  • Mechanism investigation involving lattice interactions and oxygen scavenging.

Main Results:

  • The silver cluster (Ag8) exhibits photo-switchable phosphorescence activated by UV light in the crystal state.
  • The "turn-on" luminescence is attributed to photo-induced oxygen scavenging by methanol within the lattice, reducing phosphorescence quenching.
  • The material demonstrates reversible photoactive luminescence and stability in the solid state.

Conclusions:

  • This study introduces the first photo-responsive luminescent silver cluster, expanding the family of coinage metal clusters.
  • A novel strategy for developing stimuli-responsive materials based on metal clusters is presented.
  • The Ag8 cluster's properties led to the development of a specialized photo-responsive ink for 3D printing.