Stable and self-healing perovskite for high-speed underwater optical wireless communication

Green light experiences minimal attenuation in water, rendering it indispensable for underwater wireless optical communication (UWOC). Among green light emitters, perovskite materials stand out due to their exceptional optical properties and cost-effectiveness, serving as reliable candidates to easily manufacture green light sources. However, in underwater environments, perovskites are susceptible to structural damage, which can lead to communication device failures. In this study, we introduce an innovative perovskite-based UWOC system, where the perovskite light source possesses the ability to autonomously self-repair. Firstly, we implement F-ion modification on CsPbBr3 QWs, significantly enhancing perovskite thermal stability. Subsequently, we incorporate CsPbBr3:F QWs into an all-dipole fluorine, imparting self-healing properties to the device. This results in the creation of a robust system capable of withstanding underwater conditions. This system can seamlessly integrate into a UWOC setup, achieving high-speed underwater communication. Remarkably, the device not only sustains stable operation in underwater environments for over a week but also fully restores communication speed after self-repair from complete breakage. Our innovative design provides substantial support for the future development of perovskite-based underwater communication technology and optoelectronics devices. A water-resistant and self-healing perovskite light source employed for underwater wireless optical communication.