A Narrowband Perovskite Photodetector for Blue Light Hazard Detection

Human eyes' protection becomes more and more important due to the increasing dependence on screens and lighting sources. In this work, a narrowband blue light photodetector based on CH3NH3PbBrCl2 single crystal and its filterless application in blue light hazard detection has been reported. It is found that the photodetector is only sensitive to light between 400 and 500 nm, eliminating the influence of other light photons. Then the relationship between the blue light weighted radiance and photocurrent can be described as a numerical function, through which the blue light hazard level can be detected. By introducing the back-end circuits, the photodetector has been applied to a portable blue light hazard detection system, which can detect and display the blue light hazard level of illuminations. Thus, this photodetector and its application may have potential applications in the future healthcare field.