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Optically Activated Delayed Fluorescence.

Blake C Fleischer1, Jeffrey T Petty2, Jung-Cheng Hsiang1

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Researchers developed optically activated delayed fluorescence (OADF) using silver nanoclusters. This novel fluorophore technology enables efficient fluorescence detection by minimizing background noise.

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Area of Science:

  • Photophysics
  • Nanomaterials Science
  • Fluorescence Spectroscopy

Background:

  • Few-atom silver nanoclusters exhibit unique photophysical properties.
  • Delayed fluorescence typically relies on thermal or collisional activation for reverse intersystem crossing.
  • Existing fluorescence detection methods struggle with high background noise.

Purpose of the Study:

  • To develop a novel fluorophore system for optically activated delayed fluorescence (OADF).
  • To investigate the photophysics of silver nanoclusters for OADF applications.
  • To enhance fluorescence detection sensitivity and background rejection.

Main Methods:

  • Harnessing the photophysics of few-atom silver nanoclusters.
  • Utilizing near-infrared light for excitation of photopopulated dark states.
  • Investigating long-lived excited states and reverse intersystem crossing mechanisms.

Main Results:

  • Demonstrated the first fluorophores capable of OADF.
  • Achieved optically controllable visible emission with a 2.2 ns fluorescence lifetime.
  • Showcased OADF's ability to occur microseconds after excitation, gated by near-IR light.
  • Observed improved background rejection in fluorescence detection.

Conclusions:

  • OADF, enabled by silver nanocluster photophysics, offers superior background rejection.
  • This optically controllable fluorescence significantly enhances signal recovery.
  • OADF technology is potentially extensible to other fluorophores with excited dark states.