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Photophysical Properties of Upconverting Nanoparticle–Phthalocyanine Complexes

D. A. Gvozdev1,a*, E. P. Lukashev1, V. V. Gorokhov1, and V. Z. Pashchenko1

1Lomonosov Moscow State University, Faculty of Biology, 119991 Moscow, Russia

* To whom correspondence should be addressed.

Received January 9, 2019; Revised March 18, 2019; Accepted April 12, 2019
Interaction between upconverting nanoparticles and aluminum octacarboxyphthalocyanine was studied. The efficiency of non-radiative energy transfer from the nanoparticles to phthalocyanine increased with the number of phthalocyanine molecules adsorbed on the nanoparticle, but only up to a certain limit. Further increase in the phthalocyanine concentration resulted in a decrease of its sensitized fluorescence due to the dimerization of dye molecules on the nanoparticle surface. When subjected to infrared irradiation, phthalocyanine molecules in the hybrid complex generated singlet oxygen. The observed effects are of interest in regard to the targeted search for new components of efficient third-generation hybrid photosensitizers.
KEY WORDS: UCNP, upconversion, photosensitizers, FRET, singlet oxygen

DOI: 10.1134/S0006297919080078