• • The Cs2AgBiBr6 QDs/organic single crystal heterojunction achieves a photosensitivity of 7.22 × 10^5 and a detectivity of 2.15 × 10^15 Jones at 425 nm, enabling high-sensitivity blue-light detection for neuromorphic vision and optical communication.
• • The device exhibits dual-functional light adaptation: it emulates synaptic behavior under blue light pulses (with persistent hole accumulation in pentacene) while showing only a photo-switching effect under green/red light, enabling selective blue-light hazard protection and temporal sequence monitoring.
• • A proof-of-concept 9 × 9 device array integrated into an intelligent handwriting system successfully distinguishes writing stroke order under blue light, with slow EPSC decay kinetics allowing dynamic monitoring; red light produces identical outputs regardless of timing, confirming color-selectivity.
• • The space-confined vertical growth technique combined with polymer-free transfer yields a low-defect interface, addressing interfacial defects and stability issues that previously hindered PQD-based synaptic devices, thus improving carrier mobility and device reliability.