Inspired by human brains, optoelectronic synapses are expected as one of significant steps for constructing neuromorphic systems. In addition, intensive attention has been paid to biodegradable and biocompatible materials for developing green electronics. In this regard, environmentally friendly organic optoelectronic synaptic transistors based on wood-derived cellulose nanopaper (WCN) as dielectric/substrate and nature chlorophyll-a as photoactive material are demonstrated. Both WCN and chlorophyll-a are biocompatible and biodegradable materials from natural organisms. Versatile synaptic behaviors have been well mimicked by the modulation of both electrical and optical signals. More significantly, optical wireless communication is experimentally emulated and the information processing capability is also verified in pattern recognition simulation. Furthermore, the flexible synaptic transistors exhibit no apparent synaptic performance degradation even when the bending radius is reduced to 1 mm. Our work may develop a promising approach for the development of green and flexible electronics in neuromorphic visual systems.

受人类大脑的启发，光电突触有望成为构建神经形态系统的重要步骤之一。此外，用于开发绿色电子产品的可生物降解和生物相容性材料也受到了广泛关注。在这方面，展示了基于木材衍生的纤维素纳米纸（WCN）作为电介质/基板和天然叶绿素-a作为光活性材料的环保有机光电突触晶体管。WCN 和叶绿素-a 都是来自天然生物的生物相容性和可生物降解材料。多种突触行为已被电信号和光信号的调制很好地模仿。更重要的是，对光无线通信进行了实验仿真，并在模式识别仿真中验证了信息处理能力。此外，即使弯曲半径减小到 1 mm，柔性突触晶体管也没有表现出明显的突触性能下降。我们的工作可能会为在神经形态视觉系统中开发绿色和柔性电子设备开发一种有前途的方法。