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

Visible-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.