High‐Efficiency Quantum Dot Permeable Electrode Light‐Emitting Triodes for Visible Light Communications and on‐Device Data Encryption

Abstract

AbstractVisible‐light communication (VLC) is a promising technology for alleviating data traffic and spectrum allocation problems. Traditional optoelectronic devices such as light‐emitting diodes (LEDs) are crucial components of VLC systems. However, two‐terminal devices are limited in their functionality and integration capabilities. Thus, a third permeable electrode (PE) is incorporated for high‐efficiency quantum‐dot PE light‐emitting triodes (PeLETs), with a maximum external quantum efficiency of 17.4% and luminance exceeding 29,000 cd m‐2. Then, we elucidate the interplay between the resistor–capacitor circuit and the charge injection process using transient electroluminescence measurements. The expanded functionalities allow the simultaneous modulation of two input data streams within a single device. The PeLETs enhance data throughput and transmission capacity through dual‐channel communication. Furthermore, on‐device data encryption is achieved using the concept of interference in the data transmission process. Single‐device data modulation using PeLETs provides a novel concept for on‐device data encryption for next‐generation, highly secure VLC systems.