Our research topics

Triplet-triplet annihilation assisted upconversion represents the phototophysical process where the molecules of the triplet sensitizer transfer energy to the molecules of the singlet emitter. Depending on the excitation wavelength, different triplet sensitizers – representatives of core-enlarged palladium or platinum porphyrins, namely tetrabenzo-, tetranaphtho- and tetraanthraporphyrins were synthesized.

For each sensitizer a suitable emitter, which shows the maximal UC efficiency, was synthesized by tuning of the energy position of the triplet states for polycyclic and heterocyclic dyes, such as anthracene, tetracene, perylene and bodipy. Such optimized upconversion pairs shows 3-5 times enhanced UC efficiency as compared to the commercial dyes.

Home-made STED scanning microscopy setup with a variable excitation and depletion beam wavelengths allows to investigate with a high resolution (down to 40 nm for some samples) both artificial objects and biological objects.