Ultrastable Perovskite Nanocrystals in All-Inorganic Transparent Matrix for High-Speed Underwater Wireless Optical Communication

The key features of lead halide perovskites, including short emission lifetime and excellent luminous efficiency in the green emission region, perfectly match the strict requirements of underwater wireless optical communication (UWOC). However, the poor stability of perovskite nanocrystals (NCs) restricts its application under water and no relevant application research has been reported. Here, extremely stable CsPbBr3 NCs in all-inorganic amorphous glass synthesized by all-solid reaction without any organic ligand are reported. The products achieve high photoluminescence quantum yield (70%) as well as excellent stability toward water, thermal treatment (200 degrees C in air) and intensive laser irradiation (3.6 kW cm(-2)). The authors also raise that the refraction index could strongly influence the lifetime values according to the oscillator strength of radiative transitions. The large refraction index of the glass matrix enhances the radiative transition rates of CsPbBr3 NCs (decay time 3.22 ns). At last, the first application of perovskite NCs for UWOC is demonstrated, achieving a bandwidth as high as 180 MHz and data rates of 185 Mbps.

Automated summary

The key features of lead halide perovskites, including short emission lifetime and excellent luminous efficiency in the green emission region, are well-suited for underwater wireless optical communication (UWOC). However, the poor stability of perovskite nanocrystals (NCs) restricts its application underwater. This study reports extremely stable CsPbBr3 NCs in an all-inorganic amorphous glass matrix, showing high photoluminescence quantum yield and excellent stability towards water, thermal treatment, and intensive laser irradiation. The refraction index can strongly influence the lifetime values of radiative transitions in the perovskite NCs, and the large refraction index of the glass matrix enhances their radiative transition rates. Finally, the first application of perovskite NCs for UWOC shows promising results with high bandwidth and data rates.