Emulating synaptic plasticity in an artificial neural network is crucial to mimic the basic functions of the human brain.In this work, we report a new optoelectronic resistive random access memory（ORRAM） in a three-layer vertical heterostructure of graphene/Cd Se quantum dots（QDs）/graphene, which shows non-volatile multi-level optical memory under optical stimuli,giving rise to light-tunable synaptic behaviors. The optical non-volatile storage time is up to ～450 s. The device realizes the functi... 

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