Reversible single-molecule white light based on controllable fluorescence resonance energy transfer

Area of Science:

• Organic Chemistry
• Photophysics
• Materials Science

Background:

• Donor-acceptor dyes are crucial for optoelectronic applications.
• Intramolecular fluorescence resonance energy transfer (FRET) enables efficient energy transfer between chromophores.
• Controlling FRET is key to developing advanced light-emitting materials.

Purpose of the Study:

• To synthesize novel Diels-Alder exo-adduct donor-acceptor dyes.
• To investigate the modulation of intramolecular FRET through spacer length and temperature-responsive bond cleavage.
• To achieve reversible single-molecule white-light emission.

Main Methods:

• Synthesis of two novel Diels-Alder exo-adduct donor-acceptor dyes with varying spacer lengths.
• Spectroscopic characterization of the synthesized dyes.
• Investigation of temperature-dependent photophysical properties and FRET efficiency.

Main Results:

• The synthesized dyes exhibit intramolecular FRET from a naphthalimide donor to a dansyl acceptor.
• Spacer length and temperature-responsive bond cleavage were successfully used to control FRET.
• Reversible single-molecule white-light emission was demonstrated.

Conclusions:

• Novel donor-acceptor dyes with tunable FRET properties were developed.
• The findings provide a new strategy for achieving controllable single-molecule white-light emission.
• This work has potential applications in advanced optical materials and single-molecule spectroscopy.