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

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.