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Metal-enhanced fluorescence exciplex emission.
Yongxia Zhang1, Buddha L Mali, Chris D Geddes
1Institute of Fluorescence and Department of Chemistry and Biochemistry, University of Maryland Baltimore County, 701 East Pratt Street, Baltimore, MD 21202, USA.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|November 1, 2011
Summary
Researchers observed metal-enhanced exciplex fluorescence for the first time using anthracene and diethylaniline near silver nanoparticles. This metal-enhanced fluorescence technology shows improved monomer and exciplex emission, advancing photophysics understanding.
Area of Science:
- Photophysics
- Plasmonics
- Fluorescence Spectroscopy
Background:
- Exciplex fluorescence is crucial for understanding molecular interactions.
- Metal-enhanced fluorescence (MEF) offers potential for signal amplification.
- Limited studies exist on MEF of exciplex systems.
Purpose of the Study:
- To report the first observation of metal-enhanced exciplex fluorescence.
- To investigate the role of silver nanoparticles in enhancing exciplex emission.
- To elucidate the mechanisms behind metal enhancement in exciplex systems.
Main Methods:
- Fabrication of Silver Island Films (SIFs).
- Spectroscopic analysis of anthracene and diethylaniline mixtures with and without SIFs.
- Investigation of monomer and exciplex fluorescence emission.
Main Results:
- Observed significant enhancement in both monomer and exciplex fluorescence emission in the presence of SIFs.
- Demonstrated that surface plasmons efficiently radiate coupled monomer and exciplex fluorescence.
- Showcased enhanced absorption due to the enhanced electric near-field effect.
Conclusions:
- Metal-enhanced exciplex fluorescence is achievable and significant.
- Surface plasmon radiation and enhanced absorption are key mechanisms for MEF.
- This work deepens the understanding of complex photophysics in MEF technology.
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