Synthesis and utilization of rare-earth ion-doped polynuclear organic ligand transilluminants exhibiting high fluorescence conversion efficiency

A novel agricultural film, called light conversion film, has been developed to enhance the agricultural environment by regulating light, temperature, and humidity. Enhancing the ultraviolet (UV) absorption and durability of light conversion agents is crucial for meeting agricultural requirements. In this investigation, a light conversion agent (denoted as LTTF) was synthesized utilizing Eu ³⁺ as the luminescent centre and 2-thiazoyltrifluoroacetone (TTA), triphenylphosphine oxide (TPPO), and 1,10-phenanthroline (Phen) as ligands. The LTTF can convert harmful UV radiation into red light, which is beneficial for plant utilization, exhibiting a high fluorescence quantum yield (PLQY) of 96.12%. Blending LTTF with polyethylene (PE) led to the formation of light conversion films (LM) which demonstrated over 20 times greater efficiency than pure PE films. Field trials demonstrated that soil temperature under LM cover increased by 13% compared to soil with PE film. Plants grown under LM cover exhibited increases in height by 21.2% and 25.65%, stem thickness by 13.8% and 15.5%, leaf area by 8.83% and 12.25%, fresh matter by 40.53% and 83.45%, and dry matter by 56.24% and 137.55%, relative to plants covered with PE film and bare ground, respectively. Additionally, the yield of spring maize in soil covered with LM reached 23742.15 kg·ha ^− 1 , representing a 3.78% increase compared to soil covered with PE. Furthermore, LM was found to elevate soil temperature and potentially enhance the sowing time of spring maize, thereby promoting the maturity of maize and offering a novel approach to enhance crop yield and economic returns.