Basic synaptic peroformance of the device. (a) Schematics of the light-triggered bio-synapse and 2D-MOF-based neuromorphic transistors. (b) The synaptic response of our device to the light spikes with different wavelengths (inset, the change of the EPSC vs light wavelength). (c-d) The LTP or STP formation in our photonic synaptic device depends on the light-spike duration (λ= 430 nm, intensity: 100 μW/cm2) and the light-spike intensity (λ= 430 nm, duration: 1 s). (e) The PPF ratios at various spike intervals.