Author(s): Ma, ZH (Ma, Zhanhong); Li, XD (Li, Xiaodong); Zhang, CX (Zhang, Chengxi); Turyanska, L (Turyanska, Lyudmila); Lin, S (Lin, Shan); Xi, X (Xi, Xin); Li, J (Li, Jing); Hu, TG (Hu, Tiangui); Wang, JF (Wang, Junfei); Patane, A (Patane, Amalia); Zhao, LX (Zhao, Lixia)

Source: ACS APPLIED NANO MATERIALS Volume: 4 Issue: 8 Pages: 8383-8389 DOI: 10.1021/acsanm.1c01604 Published: AUG 27 2021

Abstract: The modulation bandwidth of white light-emitting diodes (LEDs) is an important factor in a visible-light communication (VLC) system, which is mainly limited by the down-conversion materials. The broad spectrum and long lifetime of conventional light conversion materials represent an obstacle to future technological developments. Here, we show that inorganic semiconductor perovskite nanocrystals offer a promising alternative nanomaterial. Anion exchange between different perovskite nanocrystals by post-synthesis is a highly efficient protocol to tune the chemical composition and optoelectronic properties of lead halide perovskite nanocrystals. The fine-tuning of the nanocrystal fluorescence is achieved by blending colloidal solutions of CsPb(Br/I)(3) lead halide perovskites with different contents of the halide. The tunable optical emission and short fluorescence lifetime (<5 ns) of the nanocrystals are exploited to realize white LEDs with a high modulation bandwidth (0.7 GHz), offering a potential route toward fast, energy-efficient visible-light communication.

Accession Number: WOS:000692034900082

ISSN: 2574-0970

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