Synthesis Of Wavelength Conversion Material And Its Application In Agricultural Plastic Film

Agricultural plastic films have played an important role in agricultural production, in which adding the light conversion agent can greatly improve the utilization ratio of sunlight for clops, and further increased the agricultural production. Traditional light conversion agents, including organic dyes, inorganic salts and their coordination compounds, have many limitations such as low luminescence efficiencies, easy to join, difficult to film and high cost. Therefore, in order to make better use of light, it is important to develop the more effective light conversion materials. In the present study, new agricultural plastic films, which made by three new light conversion materials the author have synthesized, have obtained a satisfied effect.Complexes with terbium as the core and Poly( D,L-lactide-co-glycolide) as the first ligand formed in the water have been studied, and the optimal dosage of terbium, Poly( D,Llactide-co-glycolide) and glycine have been obtained. Further study showed that different surfactant have an enhanced effect on fluorescence of complexes, especially sodium dodecyl sulfate. Meanwhile the impact of acidity on the fluorescence intensity have also been explored. Finally, Terbium- Poly(D,L-lactide-co-glycolide)- glycine- sodium dodecyl sulfate complex was obtained under the conditions of 249 nm for excitation wavelength, and 544 nm for emission wavelength. Mixing the complex into the plastic film in proper proportion, the authors obtained the rare earth light conversion film which can convert ultraviolet part of sunlight to the visible light for crop photosynthesis.The rare earth element europium which has strong fluorescence was chosen as the center ion with methybenzotriazole as the first ligands and di-iso-decyl phthalate as association ligands for adjacent to investigate the fluorescence of complexes formed in the ethanol solution and to determine the best proportion of europium, methybenzotriazole and adjacent di-iso-decyl phthalate. Further study found that the surfactant CTMAB acted as adjacent significantly enhanced the fluorescence of complexes. The europium-methybenzotriazole- diiso-decyl phthalate-CTMAB complexes were added into the plastic film to get fluorescence excitation wavelength of 350 nm, emission wavelength of 613 nm, obtaining the rare earth light conversion film which can convert ultraviolet part of sunlight to the red orange for crop photosynthesis. To obtain the europium-methybenzotriazole-phenanthroline-CTMAM complexes, the doped into the plastic film, and the fluorescent film characterized.Rhodamine B was selected as test material for its enhancement effect of fluorescence, and polyethylene glycol was used to as long chain. The Rhodamine B was derived by esterification reaction and obtain a fat-soluble long-chain, and spectroscopy and fluorescence characterized. The derivative was obtained under the conditions of 568 nm for excitation wavelength, and 603 nm for emission wavelength. Mixing the derivative into the plastic film in proper proportion, the authors obtained the rare earth light conversion film which can convert green-yellow part of sunlight to the red-orange light for crop photosynthesis.