Abstract
The formation of nonluminescent aggregates of aluminium sulfonated phthalocyanine in complexes with CdSe/ZnS quantum dots causes a decrease of the intracomplex energy transfer efficiency with increasing phthalocyanine concentration. This was confirmed by steady-state absorption and photoluminescent spectroscopy. A corresponding physical model was developed that describes well the experimental data. The results can be used at designing of QD/molecule systems with the desired spatial arrangement for photodynamic therapy.
Highlights
Semiconductor quantum dots (QDs) and their complexes with organic molecules have been a subject of extensive research during the last couple of decades
The nonradiative intracomplex energy transfer in nonconjugated complexes of sulfonated phthalocyanines (PcSz) molecules with CdSe/ZnS QDs in an aqueous solution has been studied by absorption and PL spectroscopy
A sharp decrease of the energy transfer efficiency with increasing PcSz concentration has been found. This effect has been explained by the formation of nonluminescent aggregates of PcSz in the complexes with CdSe/ZnS QDs
Summary
Semiconductor quantum dots (QDs) and their complexes with organic molecules have been a subject of extensive research during the last couple of decades. The FRET efficiency of a complex of a quantum dot with m independent acceptors arrayed around its center at a fixed distance R can be determined as follows [15,36]: where P(m) is the probability of a QD having m acceptor molecules, n is the concentration ratio n = Ca/Cd, Ca and Cd are the concentrations of PcSz acceptor and QD donor in the mixture, respectively.
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