Fluorescence resonance energy transfer from a potent bioac- tive non-ionic molecule, 3-acetyl-4-oxo-6,7-dihydro-12 H indolo- (2,3-a)quinolizine, to a cationic fluorophore, phenosafranin, has been investigated using steady state absorption as well as steady- state and time-resolved fluorescence techniques. From the quenching of the donor fluorescence by the acceptor, Stern- Volmer constant has been determined. The energy transfer process follows a long range dipole-dipole interaction mechanism. The energy transfer efficiency, the critical energy transfer distance and the distance between the acceptor and the donor have been determined for the fluorescence resonance energy transfer process.

Fluorescence resonance energy transfer from a bioactive non-ionic molecule to a cationic photosensitizer in aqueous solution shows potential for efficient and long-range photoluminescence conversion.

Fluorescence resonance energy transfer from a β-carboline analogue to a cationic photosensitizer in aqueous solution

Key Takeaway: Fluorescence resonance energy transfer from a bioactive non-ionic molecule to a cationic photosensitizer in aqueous solution shows potential for efficient and long-range photoluminescence conversion.