Perovskite Nanocrystals as a Color Converter for Visible Light Communication

TLDR

Visible light communication uses LEDs or laser diodes for simultaneous illumination and data transmission, but conventional phosphors limit its modulation bandwidth. The study proposes a solution‑processed CsPbBr₃ perovskite nanocrystal light converter integrated with a conventional red phosphor for VLC. They fabricated a white‑light converter by solution‑processing CsPbBr₃ perovskite nanocrystals and combining them with a conventional red phosphor. The resulting converter achieves a 491 MHz modulation bandwidth—about 40 times higher than conventional phosphors—supports data rates up to 2 Gbit/s, and delivers a high‑color‑rendering white light (CRI 89, 3236 K) for dual VLC and lighting.

Abstract

Visible light communication (VLC) is an emerging technology that uses light-emitting diodes (LEDs) or laser diodes for simultaneous illumination and data communication. This technology is envisioned to be a major part of the solution to the current bottlenecks in data and wireless communication. However, the conventional lighting phosphors that are typically integrated with LEDs have limited modulation bandwidth and thus cannot provide the bandwidth required to realize the potential of VLC. In this work, we present a promising light converter for VLC by designing solution-processed CsPbBr3 perovskite nanocrystals (NCs) with a conventional red phosphor. The fabricated CsPbBr3 NC phosphor-based white light converter exhibits an unprecedented modulation bandwidth of 491 MHz, which is ∼40 times greater than that of conventional phosphors, and the capability to transmit a high data rate of up to 2 Gbit/s. Moreover, this perovskite-enhanced white light source combines ultrafast response characteristics with a high color rendering index of 89 and a correlated color temperature of 3236 K, thereby enabling dual VLC and solid-state lighting functionalities.