South China University of Technology and Guangdong Choicore Optoelectronics Company Ltd in China report on using graded indium gallium nitride (InGaN) quantum barriers (QBs) in blue light-emitting diode (LED) to improve the modulation frequency performance of devices grown on silicon (Si) with a view to deployment in visible light communication (VLC) systems [Lei Lei et al, IEEE Electron Device Letters, published online 11 November 2024].

The team sees VLC as a potential supplement to the overcrowded spectrum of existing wireless communication systems. …