Neuromorphic　computing,　with　information　sensing,　processing,　and　storage　capabilities,　is　driving　the　development　of　a　new　generation　of　artificial　intelligence　(AI).　Photonic　synaptic　devices　are　essential　components　for　improving　information　processing　efficiency　owing　to　their　advantages　of　a　high　propagation　speed,　low　latency,　and　large　bandwidth.　In　this　study,　a　photonic　synaptic　transistor　simply　based　on　p-type　organic　semiconductor　blending　with　n-type　organic　semiconductor　was　fabricated　via　simple　solution　process　in　which　only　light　was　used　to　control　the　enhancement　and　inhibition　of　the　synaptic　conductance.　The　device　can　simulate　fundamental　synaptic　properties.　Additionally,　the　coordination　between　light　stimulation　and　electrical　stimulation　was　investigated,　and　the　results　show　that　light-pulse　stimulation　is　beneficial　for　increasing　the　response　current　simulated　by　electrical　pulses.　This　work　represents　a　significant　step　towards　the　realization　of　high-efficiency　AI　electronics.