High‐Speed Quantum Dots White Light‐Emitting Diodes Based on Förster Resonance Energy Transfer Achieving 1.77 Gbps Rates

Abstract High data rates and high luminous efficiency are critical requirements for white light‐emitting diodes (WLEDs) to serve dual roles of data transmission and illumination in visible light communication (VLC) systems. The achievable data rate is fundamentally limited by the modulation bandwidth and the signal‐to‐noise ratio. However, current luminescent materials for photoluminescence‐based WLEDs cannot achieve the short fluorescence lifetimes required for high‐speed communication without sacrificing luminous efficiency. In this work, this limitation is overcome by designing a color conversion layer based on a Förster resonance energy transfer (FRET) system, comprising the CsPbBr ₃ quantum dots (QDs) as donors and the CdSe/CdZnS/ZnS QDs as acceptors. This design shortens the fluorescence lifetime of the CsPbBr ₃ QDs, while the high PLQY of the FRET system is maintained. By controlling the FRET process, the CsPbBr ₃ QDs achieve a record‐breaking data rate of 980 Mbps using On‐Off Keying modulation, a 3.56‐fold increase from the initial 215 Mbps. The resulting WLEDs demonstrate white‐light data rates of 1.77 Gbps under discrete multitone modulation. This work provides a new strategy to break the speed‐efficiency trade‐off in luminescent materials, bridging the gap between energy‐efficient lighting and ultrafast optical communication systems for next‐generation communication technologies.