Li Promoting Long Afterglow Organic Light‐Emitting Transistor for Memory Optocoupler Module
Yu‐Sheng Chen, Hanlin Wang, Chen Hu, Weimin Zhang, Michael Pätzel, Bin Han, Kexin Wang, Shunqi Xu, Verónica Montes‐García, Iain McCulloch, Stefan Hecht, Paolo Samorı́
Abstract
Abstract The artificial brain is conceived as advanced intelligence technology, capable to emulate in‐memory processes occurring in the human brain by integrating synaptic devices. Within this context, improving the functionality of synaptic transistors to increase information processing density in neuromorphic chips is a major challenge in this field. In this article, Li‐ion migration promoting long afterglow organic light‐emitting transistors, which display exceptional postsynaptic brightness of 7000 cd m −2 under low operational voltages of 10 V is presented. The postsynaptic current of 0.1 mA operating as a built‐in threshold switch is implemented as a firing point in these devices. The setting‐condition‐triggered long afterglow is employed to drive the photoisomerization process of photochromic molecules that mimic neurotransmitter transfer in the human brain for realizing a key memory rule, that is, the transition from long‐term memory to permanent memory. The combination of setting‐condition‐triggered long afterglow with photodiode amplifiers is also processed to emulate the human responding action after the setting‐training process. Overall, the successful integration in neuromorphic computing comprising stimulus judgment, photon emission, transition, and encoding, to emulate the complicated decision tree of the human brain is demonstrated.