## 3 Results  
The characteristics of nanosized fluorophores and polymers based on them, which produce photoconversion of UV radiation into the blue and red regions of the visible spectrum, have been investigated. The sizes of the obtained nanoparticles of fluorophores were investigated (Figure 1). Using the method of dynamic light scattering, it was shown that nanoparticles of a fluorophore emitting in the red spectral region have average size of about 7 nm (Figure 1a). Fluorophore nanoparticles emitting in the blue region of the spectrum have an average size of about 15 nm (Figure 1a). It was shown using TEM that fluorophore nanoparticles are predominantly spherical and weakly aggregate even on solid substrates (Figure 1b). It should be noted that the size obtained with the dynamic light scattering method and the TEM are the same. For implantation into a polymer film, the nanoparticles were placed in acetone. The photoluminescence spectra of nanoparticles in acetone and fluoropolymer were studied (Figure 2). In an analytical study of the emission of nanoparticles, excitation was performed using a diode-pumped solid-state laser at a wavelength of 375 nm. As can be seen from Figure 2a, in photoluminescence, photons have an average energy of about 2 eV (range 1.88-2.13 eV) and 2.7 eV (range 2.47-2.83 eV). The determined quantum yields were 22% and 28%. The recorded quantum yield of nanoparticles is comparable to the previously recorded quantum yield of nanoparticles of this type [33]. In the photoluminescence spectrum of a polymer film containing photoluminescence nanoparticles (Figure 2b), two maxima of luminescence are observed (450 and 655 nm). In general, it can be argued that when using a light-converting composite film, we get light close to a black body with the imposition of \"blue\" and \"red\" components on it. The effect of photoconversion fluoropolymer films on the growth rate of _Capsicum annuum_ L., _Solanum melongena_, _Cucumis sativus_, and _Solanum lycopersicum_ has been studied. It is shown that photoconversion polymer films increase the growth rate of all studied plants (Figure 3). For a quantitative assessment of the growth rate in plants, using the program we developed, the change in the area of leaf plates was estimated (Figure 4a). The median leaf area of Cucumis sativus grown under the photoconversion film is about 20% larger than the leaf area of control plants. The leaf area of pumpkin, pepper, and tomato grown under photoconversion film is 25, 30, and 55% higher, respectively, in comparison with control plants. The greatest influence on the growth rate is observed in tomato plants. Figure 4b shows the dynamics of changes in the area of leaves of tomato grown under  
Figure 1: Size distribution of nanoparticles of fluorophores. **(a)** Size distribution of nanoparticles of fluorophores obtained using dynamic light scattering. Red NP-fluorophore nanoparticles with emission in the red region of the spectrum. Blue NP-fluorophore nanoparticles with blue emission. **(b)** TEM photograph of a preparation of a fluorophore containing nanoparticles with emission in both the red and blue spectral regions. control film and photoconversion film. It was found that the leaf area of tomato plants grown under a photoconversion coating by the end of 4 weeks of growing season is significantly larger than in the control group. By the end of the fifth week of the growing season, the difference reaches, on average, almost 55%. For most crops, biomass accumulation is often not a priority. More often, the weight of the fruits and its quality are much more important. In the case of tomatoes, the main indicator is the weight of the fruits from one bush. We grew tomato fruits in photoconversion coated greenhouses and control greenhouses (Figure 4a). In polycarbonate greenhouses (control greenhouses), about 7.6 kg of fruit (median weight) were collected from one bush (Figure 4b). When plants were grown under photoconversion polymer coatings, the median weight of fruits was about 8.7 kg per bush.