The Photophysical Properties of Multi-Functional Quantum Dots-Magnetic Nanoparticles-Indium Octacarboxyphthalocyanine Nanocomposite

This work presents the development of a multifunctional hybrid nanoparticle made of (L-)glutathione capped quantum dots (GSH-CdSe@ZnS), amino functionalized Fe3O4 magnetic nanoparticles and indium octacarboxy phthalocyanine (ClInPc(COOH)(8)). In this work we investigate the photophysical properties of the individual components and the hybrid nanoparticle, in addition we study the energy transfer (Forster Resonance Energy Transfer (FRET)) in the complex. FRET efficiencies of similar to 48 % were obtained for energy transfer between the QDs (when alone or linked to MNPs). Both triplet yields and lifetimes of ClInPc(COOH)(8) increase in the nanocomposite, with a decrease in fluorescence lifetime. The hybrid nanoparticle showed improved photophysical properties and as a result can be used in photodynamic therapy.