demonstrated enhanced signal and optical gain compared to a communication link directly using a blue LED 20 . However , in their work , low absorption was observed in the UV wavelength region , which restricted the application of their material to a UV - based communication link . We envisage that the achieved data rates can be further improved by using a more complex modulation scheme ( e.g. , orthogonal frequency - division multiplexing ) , preequalisation , bit loading and power allocation . Moreover , with the improvement in the modulation bandwidth of the solar - blind UVC LED and realisation of the UVC LD , a higher modulation bandwidth of up to hundreds of megahertz can be expected in the near future .    b Bit - error rate ( BER ) of data transmission at different data rates without a CsPbBr 3 perovskite NC layer and a 500 - nm long - pass filter . For comparison , an optical density ( OD ) filter was added to ensure that the optical power illuminating the APD is the same as that in the case of CsPbBr 3 perovskite NCs and is below the saturation limit of the APD . The insets show the corresponding eye diagrams . c BER of data transmission at different data rates with the colour - converting CsPbBr 3 perovskite NC layer and UV light filtered by a 500 - nm long - pass filter . The insets show the corresponding eye diagrams modulation bandwidth of the CsPbBr 3 perovskite NC layer is lower than that in the prior work by Dursun et al . 2 , the PLQY in the present work is significantly higher by approximately 30 % when the NCs are drop - cast in the form of a thin film , and thus , a higher photon conversion efficiency is exhibited that can improve photodetection . Moreover , the lower modulation bandwidth in the present work compared to prior work could be attributed to the competing band states and dynamics of recombination mechanisms in the CsPbBr 3 perovskite NCs 45,46 . However , thorough investigations are still required to understand the mechanisms so that one can potentially manipulate the recombination dynamics favourable for the design of perovskite - based optoelectronic devices in the future . Compared to other prior works , our study highlighted the superior performance of the CsPbBr 3 perovskite NC layer with a high - PLQY and a fast - PL decay time for a novel receiver design and potential monolithic integration with a Si - based receiver in a UVbased communication link .