Update: it turns out that researchers from Durham University have also published an article on OLEDs for Li-Fi networks, just a couple of months ago

Researchers from the University of St. Andrews in Scotland are investigating how OLEDs can be used to enable better Li-Fi networks. A Li-Fi network uses rapid flickers in room lighting to send communication signals which complements Wi-Fi and increase bandwidth.

The idea is that patterned OLEDs are placed on top of small blue LEDs (which are themselves driven by high-speed chips). The OLEDs actually perform as a color conversion layer - they multiplex the signals into other colors. The researcher imprint a diffraction grating into the OLED panels, and these gratings control the direction in which the signal was sent. This is used for relatively slow-speed direction-controlled communication - to provide increased security or reduce power consumption.

The researchers are trying out all sorts of technologies to perform the grating, and are also looking at ways to make the OLED-based communication more efficient. They are even looking at adding quantum-dots as a color conversion layer inside the OLEDs.

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