Artificial Light-Harvesting System with White-Light Emission in a Bicontinuous Ionic Medium.

Area of Science:

• Materials Science
• Photochemistry
• Supramolecular Chemistry

Background:

• Artificial light-harvesting systems (ALHSs) are inspired by natural photosynthesis and are crucial for energy conversion.
• Förster resonance energy transfer (FRET) is a key mechanism in ALHSs for energy transfer between donor and acceptor molecules.
• Binary ALHSs offer simplified composition but are limited by the availability of fluid donors, especially in ionic systems.

Purpose of the Study:

• To develop a novel binary ALHS utilizing an ionic naphthalimide derivative as a fluid donor.
• To investigate the efficiency of FRET in this new ionic ALHS system.
• To explore the potential for tunable color emission, including white light, for diverse applications.

Main Methods:

• Synthesis and characterization of an ionic naphthalimide (NPI) derivative as a donor.
• Blending the NPI donor with acceptor molecules (rhodamine 6G, pyridinium iodide).
• Experimental measurements and molecular dynamics simulations to confirm FRET and quantify energy transfer efficiency.

Main Results:

• The ionic naphthalimide donor exhibits improved photoluminescence in its bicontinuous liquid structure.
• Efficient FRET was confirmed between the NPI donor and acceptors, achieving up to ~90% energy transfer efficiency.
• Tunable color emission, including white light, was achieved by adjusting the acceptor/donor ratio.

Conclusions:

• A new, efficient binary ALHS based on an ionic naphthalimide donor has been successfully developed.
• The system demonstrates high FRET efficiency and tunable emission properties.
• This work paves the way for advanced applications in light-emitting diodes and photoluminescent inks.