Abstract
We investigate the mechanisms of energy transfer from CdSe quantum dots (QDs) to porphyrin derivatives as a potential antenna system with enhanced light-harvesting efficiency. Two ferrocenyl-containing tetraazaporphyrin derivatives, namely, magnesium 2(3),7(8),12(13),17(18)-tetraferrocenyl-5,10,15,20-tetraazaporphyrin (TAPFcMg) and magnesium 2(3),7(8),12(13),17(18)-tetracyano-3(2),8(7),13(12),18(17)-tetraferrocenyl-5,10,15,20-tetraazaporphyrin (TAPFcCNMg), are used as energy acceptors in this proposed antenna system along with size-dependent QDs as donors. Our approach includes Forster resonance energy transfer (FRET) calculations as well as photoluminescence (PL) intensity and lifetime quenching measurements. Our FRET calculations indicate that higher energy transfer efficiency can be achieved with smaller quantum dot size. However, PL intensity and lifetime measurements suggest that energy transfer efficiency in QD/tetraazaporphyrin complexes is regulated by a competing trap-assisted ultrafast quenching...
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