Synthesis of Highly Stable Coumarin-Based Fluorescent Dye, Its Photophysical Properties and Stability in PLA Film and Application Towards Sensing Toxic Ions.

New materials were designed and synthesized by introducing electron donor and acceptor groups using coumarin as the basic unit. In addition, two more materials with similar structures were synthesized for the comparison of their optical properties and stability. The solvent effect and the photo physical aggregation properties of aggregation caused quenching (ACQ) in the ratio of water and DMF were also investigated. In addition, we checked the detection ability for anions, and the optical properties of the materials at different pH were also investigated. The photo stability of these synthesized materials was studied, and interesting results were obtained. Based on these synthesized materials, we produced films by introducing color materials into PLA films. PLA film is characterized by the absence of plastic waste due to carbon reduction and biodegradation effects from using biomass instead of fossil fuels as raw materials, but it has the disadvantage of low light stability. By introducing high-photo stability pigment materials, the photo stability of the film can be corrected, and UV protection can be provided. The UV absorbance and fluorescence intensity of the film with the dye materials were checked, and the mechanical properties and thermal stability of the film changed when the coloring material was introduced compared to the conventional PLA film.