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.
| Original language | English |
|---|---|
| Pages (from-to) | 8383-8389 |
| Number of pages | 7 |
| Journal | ACS Applied Nano Materials |
| Volume | 4 |
| Issue number | 8 |
| DOIs | |
| State | Published - 27 Aug 2021 |
| Externally published | Yes |
Keywords
- anion exchange
- fluorescence lifetime
- modulation bandwidth
- perovskite
- visible-light communication