Stokes/anti-Stokes luminescence in Er3+-doped fluoride glass enabled dual-mode ultraviolet/infrared photodetection and visible-display integration for secure optical communication

Here, we introduce infrared optical material—Er3+ doped fluoride glass—into conventional organic photodetectors, enabling new material options for advanced photodetection and imaging technologies. A novel compact system that achieves dual-mode of ultraviolet (UV) / infrared (IR) photodetection and visible display by introducing fluoride glass with excellent Stokes/anti-Stokes luminescence in an organic photodetector (OPD). This device exhibits an ultra-wideband response across multiple wavelengths, ranging from approximately 250 nm to 1550 nm. It presents impressive IR responsivity (~8 mA/W with anti-Stokes luminescence) and UV photoresponse enhancement (from ~ 1.5 μA to ~ 3.5 μA with Stokes luminescence). Additionally, it enables direct visible display for wavelengths of 1550 nm, 980 nm, and 355 nm. The device can function effectively at high temperatures of up to 200 °C for 30 minutes. Based on this device, a visible and secure optical communication process is successfully realized with UV (275 nm)-IR (1550 nm) communication bands.