Biomass‐Derived Transparent Bamboo Composite Films with Europium‐Based Photoconversion for Energy‐Efficient Smart Agriculture

The rational design of sustainable light‐conversion agricultural materials is critical for enhancing solar energy utilization efficiency and advancing low‐carbon farming systems. In this study, we propose a biomass‐derived composite strategy by integrating transparent bamboo (TB), a natural, renewable substrate, with the europium‐based luminescent complex Eu(hfa) 3 (TPPO) 2 to fabricate a flexible photoactive transparent bamboo (PTB) that synergistically combines light‐conversion functionality and enhanced mechanical robustness. Experimental results demonstrate that PTB achieves 86.3% transparency and efficient UV‐to‐red light conversion, effectively transforming UV radiation harmful to plants into photosynthetically active red light. Moreover, PTB exhibits excellent thermal stability and a longitudinal tensile strength of 100.5 MPa, surpassing conventional petroleum‐based agricultural films. Growth experiments on Arabidopsis thaliana reveal that PTB coverage significantly improves plant photochemical efficiency (Fv/Fm) and biomass accumulation: 28.6% more leaves, 108.6% higher fresh weight, and 118.2% increased dry weight compared to controls. This work provides a biomass‐based design paradigm for eco‐compatible agricultural photonic materials, demonstrating promising potential in energy‐saving smart agriculture and sustainable crop production.