Fig. 4.

Applications of our OIMH in high-end anti-counterfeiting, LED emitter devices and X-ray imaging. a I-VII University logo exhibits significant color differences under different excitation wavelengths. b Schematic diagram of banknotes anti-counterfeiting technology by printing our transparent and flexible material onside. c Process of collecting sample powder. d, e Schematic diagram of the LED device with the powder of (NEA)₂MnBr₄ film inside of LED glass and the corresponding optical picture. f Photograph of the working device operated at 10 mA. g Schematic of the as-designed indirect X-ray imaging system. h-j Bright field images of a pen, a USB disk, and an AirPods earphone and their X-ray images based on the (NEA)₂MnBr₄ screen. (Color figure online)