Fast‐Response and High‐Color‐Purity RGB Fluorescent Organic Light‐Emitting Diodes for Visible Light Communication System

Abstract The integration of red, green, and blue (RGB) organic light‐emitting diodes (OLEDs) is pursued to achieve a significant advancement in high‐speed visible light communication (VLC). With their rapid decay rates of less than a few nanoseconds, fluorescent emitters enable fast data transmission by facilitating prompt emission. Here, by implementing a top‐emitting architecture with a strong cavity, the spectral crosstalk among RGB colors is addressed by narrowing the spectra and enhancing the bandwidth of fluorescent OLEDs. Furthermore, a co‐emitter configuration improves the optoelectrical characteristics of OLEDs by improving horizontal transition dipole ratios and photoluminescence quantum yield. With fluorescent emitters exhibiting nanosecond‐level decay times, the proposed OLED platform achieves an order of magnitude increase in a −3 dB cut‐off frequency exceeding 1 MHz across all RGB channels compared to phosphorescent and thermally activated delayed fluorescent OLEDs. These findings underscore the potential of OLED technology to advance high‐speed visible light communication systems, paving the way for enhanced data transmission capabilities.