Dual-Exciplex White OLEDs for Natural-Quality Lighting and Optical Data Transmission

The integration of high-quality organic solid-state lighting with high-speed optical wireless communication offers an innovative pathway toward next-generation optoelectronic devices. Here, we report a structurally simplified white organic light-emitting diode (WOLED) that achieves seamless integration of natural-light-quality illumination and visible light communication (VLC) using a unique dual-exciplex architecture. Central to this design is a versatile organic layer of PPCzTrz that serves as both an electron donor and acceptor at two distinct interfaces, establishing complementary charge-transport pathways and a voltage-controlled dynamic shift of the exciton recombination zone. This spatial redistribution balances blue and green exciplex emissions, while Förster resonance energy transfer (FRET) sequentially funnels energy to strategically positioned green, orange, and red phosphorescent ultrathin layers. The resulting multi-path exciton management strategy ensures spectrally stable white light from 400 to 700 nm, yielding a record-high color rendering index (CRI = 97), a peak external quantum efficiency of 27.0%, and a power efficiency of 85.8 lm W^-1. The same device enables high-speed VLC with a data rate of 14.0 Mbps. This work provides a scalable and energy-efficient platform that simultaneously addresses the needs of high-quality lighting and optical data transmission, paving the way for smart lighting systems and fully organic integrated optoelectronics.