Multicolor Emission in Perovskite Nanostructures via Quantum Confinement Engineering for High-Speed Optical Wireless Communication.

Color converters with broad tunability are critical for achieving large -3-dB bandwidths and high data rates in optical wireless communication (OWC). In this work, quantum confinement engineering is introduced as an effective strategy to design multicolor converters based on lead halide perovskite quantum dots (QDs) for high-speed OWC. Precise control of the size of QDs enables systematic emission tunability across the blue-green region of the visible spectrum, with their efficient photoluminescence and lifetimes of a few nanoseconds providing the wavelength flexibility required for advanced communication protocols. The size-dependent carrier dynamics were examined using transient absorption spectroscopy, confirming their suitability for multichannel operations. Integrating these multicolor converters with narrow emission bandwidth into wavelength-division multiplexing schemes enables data transmission rates of up to 4 Gbps, surpassing most existing color converters employed in OWC systems and demonstrating a practical means toward efficient, scalable, and high-capacity OWC.