Herein, we report near-infrared-to-visible up-conversion (UC) in SrF2:Yb3+,Er3+ sub-micron crystals prepared via a facile route in an aqueous solution.
The effect of upconverting luminescent nanoparticles coated on glass on the productivity of Solanum lycopersicum was studied. The cultivation of tomatoes under photoconversion glass led to an increase in plant productivity and an acceleration of plant adaptation to ultraviolet radiation. An increase in the total leaf area and chlorophyll content in the leaves was revealed in plants growing under the photoconversion glass. Plants growing under the photoconversion glass were able to more effectively utilize the absorbed light energy. The results of this study suggest that the spectral changes induced by photoconversion glass can accelerate the adaptation of plants to the appearance of ultraviolet radiation.
Fluorite-type Ca 1−x Ho x F 2+x and Sr 0.98−x Er 0.02 Ho x F 2.02+x powders were synthesized using the co-precipitation from water solution technique. The upconversion luminescence of Ca 1−x Ho x F 2+x and Sr 0.98−x Er 0.02 Ho x F 2.02+x powders in the visible spectral region upon excitation of 5 I 7 level Ho 3+ ions and 4 I 13/2 level Er 3+ ions were studied for the first time. The possibility of visualizing near IR laser radiation using Ca 1−x Ho x F 2+x and Sr 0.98−x Er 0.02 Ho x F 2.02+x powders is proposed. Optimal compositions of Ca 1−x Ho x F 2+x and Sr 0.98−x Er 0.02 Ho x F 2.02+x powders for application as visualizers are discussed.
The influence of light conversion induced by glasses coated with up-converting luminescent nanoparticles on Solanum lycopersicum cultivation was studied. Nanoparticles of Sr0.46Ba0.50Yb0.02Er0.02F2.04 solid solution were used as the up-converting luminophore. These nanoparticles were able to transform IR radiation into visible light (λem = 660 nm with minor peaks at 545 nm and 525 nm). By applying the “variable” chlorophyll fluorescence (ΔF), it was shown that the cultivation of tomatoes under the photoconversion glasses stimulated changes in the rate of plant adaptation to ultraviolet radiation. The restoration time of values of effective quantum yield of photosystem II photochemical reactions and photochemical quenching of chlorophyll fluorescence (reflecting disappearance of imbalance between photosynthetic electron transport and the utilization of NADPH) was reduced from three weeks to three days in the case of control and photoconversion films, respectively. As a result, plants grown under photoconversion glass had an increased leaf number (12.5%), total leaf area (33%), stem length (35%) and chlorophyll content in the leaves (two-fold). It is assumed that an increase in the proportion of red light in the growing spectrum has a positive effect on photosynthetic activity and plant growth.
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