Quantum yields of singlet oxygen generation was estimated using a spectrophotometric method based on the absorption changes of 1,3-diphenylisobenzofuran (DPBF, Sigma Aldrich, Germany) in methanol solution with 10 µM concentrations of compounds. Irreversible oxidation of DPBF by singlet oxygen results in the formation of peroxide, and DPBF bleaching occurs. For studying photosensitized ROS generation we used white LED MCWHLP1 (2.35 W, Thorlabs, USA, 30% of power), whose radiation was corrected by filters in the range of 500-600 nm. We carried out illumination in a pulsed mode: 3 s of illumination followed by 5 s of dark adaptation, during which the absorption spectrum of the Dye-DPBF solution was recorded.