Publication date: 22nd July 2026
Recent proliferation of data-intensive applications has posed challenges for existing wireless connectivity [1]. Optical wireless communication (OWC) integrates data communication with ambient lighting, emerging for the next-generation high-speed free-space data communication [2]. OWC transmits data by modulating light intensity, with data transmission capacity dependent on the switching speed of the emitter. In addition to making faster emitters, the capacity can be enhanced by sending data simultaneously across multiple independent channels at different emission wavelengths.
Currently, light sources employed in OWC use conventional inorganic semiconductors that exhibit high carrier mobilities and fast switching speeds. However, such materials are expensive to produce and the emission wavelength is hardly tuneable. Perovskite nanocrystals (PNCs), hold great promise for advancing OWC: they can be processed from solution, they are bright, tuneable, and narrow emitters with short luminescence lifetimes, which meet the requirements for optical communication [3].
In this work, we study compositionally engineered PNCs as colour converters for multichannel OWC. Drop-cast CsPbBr₃, CsPbI₃, and FAPbI₃ nanocrystal films are used to generate spectrally separated emission channels from visible to near-infrared spectrum. We characterise important figures-of-merit using optical spectroscopy, including photoluminescence spectra (PL), PL quantum yield and PL lifetime, and correlate these properties with OWC performance. Using a prototype free-space link, we evaluate modulation bandwidth and data transmission performance over a 50 cm optical path. Under single-channel transmission of independently seeded pseudorandom bit sequences, the three colour-converted channels support gigabit-class pulse-amplitude-modulated data links, achieving data rates of 1.70, 1.60, and 1.76 Gbps for the CsPbBr₃, CsPbI₃, and FAPbI₃ channels, respectively. This corresponds to an aggregate data rate of 5.06 Gbps in single-channel measurements and 4.38 Gbps under wavelength-multiplexed operation. These results demonstrate the potential of compositionally tuneable perovskite nanocrystals as scalable, spectrally addressable colour converters for visible to near-infrared multichannel OWC.
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