Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 8, Pages 8383-8389Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c01604
Keywords
perovskite; fluorescence lifetime; modulation bandwidth; anion exchange; visible-light communication
Funding
- National Natural Science Foundation of China [61774148, 11974343]
- Engineering and Physical Sciences Research Council [EP/K503800/1, NC/L001861/1]
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An efficient protocol of anion exchange between different perovskite nanocrystals by post-synthesis offers a promising way to tune the chemical composition and optoelectronic properties, enabling fine-tuning of the nanocrystal fluorescence for white LEDs with high modulation bandwidth. The tunable optical emission and short fluorescence lifetime of the nanocrystals are exploited for fast and energy-efficient visible-light communication.
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.
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