Improved triplet state parameters for indium octacarboxy phthalocyanines when conjugated to quantum dots and magnetite nanoparticles

• Magnetic nanoparticles and CdSe@ZnS quantum dots were separately coordinated to indium octacarboxy phthalocyanine.
• There was a decrease in the fluorescence lifetimes of the phthalocyanine in the conjugate.
• The triplet quantum yields increased in the conjugates compared to phthalocyanine alone.

Fe3O4 magnetic nanoparticles (MNPs) and glutathione (GSH) capped CdSe@ZnS quantum dots (QDs) were separately coordinated to indium octacarboxy phthalocyanine (InPc(COOH)8) to form ClInPc(COOH)8–MNPs and ClInPc(COOH)8–GSH–CdSe@ZnS, respectively. The photophysical parameters (triplet state and fluorescence quantum yields and lifetimes) were determined for the conjugates. The triplet quantum yields increased from ΦT = 0.49 for InPc(COOH)8 alone to ΦT = 0.61 and 0.56 for InPc(COOH)8 in the conjugates: ClInPc(COOH)8–MNPs and ClInPc(COOH)8–GSH–CdSe@ZnS, respectively. The lifetimes also became longer for the conjugates compared to Pc alone.

Fe3O4 magnetic nanoparticles and glutathione (GSH) capped CdSe@ZnS quantum dots were separately coordinated to indium octacarboxy phthalocyanine resulting in increased triplet quantum yields of the latter.Figure optionsDownload as PowerPoint slide