Near‐Infrared to Visible Light Converter by Integrating Graphene Transistor into Perovskite Quantum Dot Light Emitting Diodes

Abstract

A light converter system with high light sensitivity that could sense the near‐infrared (NIR) signal is one of the prerequisites for the whole Internet of Things (IoT) field. Here, a NIR to visible light converter (NVLC) which could emit visible light according to external NIR is reported. The NVLC is an integration of an inverted perovskite quantum dot light emitting diodes and a hybrid lead sulfide quantum dots/graphene transistor. The latter acts as a photodetector to convert NIR signals into electrical signals, and the former emits visible light with an intensity controlled by the electrical signals. The luminous intensity of the device, which emits green light with a peak of 520 nm, is positively correlated with the intensity of the NIR. Further, the micron‐scale NVLCs are integrated into a matrix device that could sense NIR image and display it into visible light image. The NVLC with sensing, converting NIR to visible light is believed to have various promising applications in the IoT field.