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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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Toward Multifunctional Metal Nanoclusters with NIR-II Photoluminescence.

Wanmiao Gu1,2,3, Nan Yan1,2,3, Zhikun Wu1,2,3

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Metal nanoclusters (NCs) are promising for second near-infrared (NIR-II) optical imaging due to deep tissue penetration and high resolution. Research focuses on their photoluminescence (PL) mechanisms, structure-PL correlations, and tuning methods for advanced biosensing applications.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Optics

Background:

  • The second near-infrared optical window (NIR-II, 1000-1700 nm) offers deep tissue penetration and high resolution for imaging.
  • Metal nanoclusters (NCs) are emerging as versatile NIR-II luminescence materials due to their small size, biocompatibility, and tunable photoluminescence (PL).

Purpose of the Study:

  • To review and summarize advancements in developing cluster-based NIR-II photoluminescent materials.
  • To elucidate photoluminescence mechanisms and structure-PL correlations in metal nanoclusters.
  • To explore methods for tuning PL characteristics and expanding the functional applications of luminescent metal NCs.

Main Methods:

  • Review of existing literature on metal nanoclusters for NIR-II applications.
  • Analysis of structure-photoluminescence relationships in metal nanoclusters.
  • Investigation of strategies for tuning photoluminescence properties and enhancing functionality.

Main Results:

  • Metal nanoclusters exhibit unique properties suitable for NIR-II imaging and biosensing.
  • Understanding of PL mechanisms and structure-PL correlations has been advanced.
  • Methods for tuning PL and expanding NC functions have been developed.

Conclusions:

  • Metal nanoclusters represent a significant class of materials for NIR-II optical imaging and biosensing.
  • Continued research is expected to further enhance their capabilities and applications in the NIR-II window.