This work reports the fabrication of blue luminescent bioplastic PLA films on doping with 4-chloro and 4-fluoro substituted bisarylidene cyclohexanone derivatives A and B. The successful doping of A and B to host matrix was evidenced by spectroscopic and analytical methods. The appearance of an absorption band at 1665 cm⁻¹ owing to the conjugated alkene stretching frequency for bischalcones approved the presence of guest molecules. Similarly, the crystallinity of the films was improved by the addition of dopants above 2%. Molecular dynamics simulations of mechanical properties for neat PLA for lowest dopant concentration (2%) revealed decrease in Young’s modulus and bulk modulus. The doping resulted in bathochromic shift from λ_max 290 nm to the range of 335–340 nm with high degree of UV endurance. The PLA/dopant composite films (2–8%) effectively absorbed UVB as well as UVA radiation with promising SPF ranging from 12.71–39.2, 13.26–37.57 and UPF from 17.14–902.50, 9.39–197.01 for dopant A and B respectively. The photoluminescence emission maxima were observed in the blue region at 461 nm and 463 nm for the films doped with A and B. The effective scintillation with large Stoke’s shift could be due to J-aggregate alignment of the dopants in the host matrix. The quantitative quantum yield (QY) was found to vary in the range of 0.17–0.42 for A and 0.15–0.46 for B which were comparable with flurophore anthracene with QY 0.27–0.36. Hence, these environmentally benign bioplastic composite materials with high SPF and UPF could find use as wide range UV filtering and also as blue emissive materials.

这项工作报告了通过掺杂 4-氯和 4-氟取代的双亚芳基环己酮衍生物A和B制备蓝色发光生物塑料 PLA 薄膜。光谱和分析方法证明了A和B成功掺杂到主体基质中。在 1665 cm ^-1处出现吸收带由于双查耳酮的共轭烯烃拉伸频率允许客体分子的存在。类似地，通过添加超过 2% 的掺杂剂，薄膜的结晶度得到改善。对于最低掺杂浓度 (2%) 的纯 PLA 机械性能的分子动力学模拟显示杨氏模量和体积模量降低。掺杂导致红移从 λ _max 290 nm 到 335-340 nm 的范围，具有高度的紫外线耐受性。PLA/掺杂剂复合膜（2-8%）有效吸收 UVB 和 UVA 辐射，掺杂剂A和B 的SPF 范围为 12.71-39.2、13.26-37.57，UPF 范围为 17.14-902.50、9.39-197.01分别。对于掺杂A和B的薄膜，在 461 nm 和 463 nm 的蓝色区域观察到光致发光发射最大值。具有大斯托克位移的有效闪烁可能是由于基质中掺杂剂的 J 聚集排列。发现定量量子产率 (QY) 在A的 0.17-0.42和B 的0.15-0.46的范围内变化，这与 QY 0.27-0.36 的荧光团蒽相当。因此，这些具有高 SPF 和 UPF 的环境友好型生物塑料复合材料可以用作广泛的紫外线过滤和蓝色发射材料。