Abstract
Red-pigmented photoselective polymethylmethacrylate (PMMA) films were prepared by casting from polymer/chloroform solution. The films were doped with efficient red fluorescent perylene dyes specialized for plastic coloration, namely KREMER 94720 and KREMER 94739, which have excellent weathering stability and a high fluorescence quantum yield. The effect of the doping concentration was studied using the atomic force microscope (AFM), optical transmission, color measurement, time-resolved fluorescence, and Fourier transform infrared spectroscopy (FTIR). The obtained results suggested the potential usefulness for photoselective greenhouse cladding applications as the lowest doping concentration (10−5 wt%) displaying the UV-open effect, whereas the best UV-blocking and thermic effects were obtained for the highest doping concentration (10−1 wt).
Highlights
For the past decades, plastic sheets have been used to protect the plants inside greenhouses against severe weather conditions, such as frosty cold and scorching sun
PMMA, which is commercially known as acrylic, has been widely used for greenhouse glazing due to its unique physical characteristics; it has very high transmittance and scratch resistance compared to PC [6]
A range of special photoselective PMMA greenhouse films has been proposed, including the pigmentation of greenhouse claddings to modify the sunlight spectrum entering the greenhouse in order to match the action spectrum of chlorophylls required for photosynthesis active radiation (PAR) [7,8,9,10,11,12]
Summary
Plastic sheets have been used to protect the plants inside greenhouses against severe weather conditions, such as frosty cold and scorching sun. A range of special photoselective PMMA greenhouse films has been proposed, including the pigmentation of greenhouse claddings to modify the sunlight spectrum entering the greenhouse in order to match the action spectrum of chlorophylls required for photosynthesis active radiation (PAR) [7,8,9,10,11,12] The idea of these photoselective films depends on using integrated luminescent solar concentrator (LSC) technologies for greenhouse applications [13]. The present work introduced new features for different compositions of photoselective greenhouse films based on PMMA doped with perylene dyes KREMER 94720 and KREMER 94739 These dyes have unique physical properties such as excellent photostability, intense absorbance in the green–yellow band, and fluorescence efficiency in polymer matrices [5,26]. Photoselective PMMA greenhouse films of 50 ± 10 μm were prepared as described in Polymers 2022, 14, 531
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