Static and dynamic photoluminescence (PL) quenching of polymer: quencher systems in solutions

摘要

Quenching of the PL from conjugated polymers in solution by charge transfer to electron acceptors was studied by PL measurements while varying the quencher concentration, the ion concentration in buffered aqueous solutions, and the temperature. For the aqueous solutions, the PL quenching was greatly enhanced by static quenching originating from the formation of a weakly bound complex between the anionic conjugated polymer and cationic electron acceptors. The estimated Coulomb binding energy was approx 150 meV. In contrast, for MEH-PPV and PCBM in 1,2-dichlorobenzene, dynamic quenching was identified as the basic mechanism.