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Stimuli-Responsive Molecular Photon Upconversion.

Nobuhiro Yanai1,2, Nobuo Kimizuka1

  • 1Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan.

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Summary
This summary is machine-generated.

Stimuli-responsive photon upconversion (TTA-UC) offers advanced biosensing and chemosensing. This review details how external stimuli control TTA-UC, enabling highly sensitive and selective detection systems.

Keywords:
aggregation-induced emissionphoton upconversionsensingstimuli responsetriplet-triplet annihilation

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Area of Science:

  • Photochemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Anti-Stokes emission with stimuli-responsiveness creates novel biosensing and chemosensing platforms.
  • Triplet-triplet annihilation photon upconversion (TTA-UC) is efficient at low excitation intensities.

Purpose of the Study:

  • To review recent advancements in stimuli-responsive TTA-UC systems.
  • To categorize the general mechanisms underlying TTA-UC switching.

Main Methods:

  • Summarizing TTA-UC switching induced by temperature, oxygen, chemicals, light, electric fields, and mechanical force.
  • Categorizing switching mechanisms into aggregation-induced, assembly-induced, diffusion-controlled, and energy-transfer-controlled UC.

Main Results:

  • External stimuli can effectively switch TTA-UC processes.
  • Four primary mechanisms govern stimuli-responsive TTA-UC.

Conclusions:

  • Development of smart TTA-UC systems enhances sensing sensitivity and selectivity.
  • Integrating TTA-UC with supramolecular, materials, mechanochemistry, and biochemistry expands its applications.