Efficient White Light Emission from Ga/Ga₂O₃ Hybrid Nanoparticles

Abstract Gallium (Ga) emerges as a promising material in plasmonics mainly due to its extraordinary properties, such as changeable material phase, tunable plasmon resonances across the ultraviolet to near‐infrared spectral range, and remarkable chemical stability. Here, the efficient white light emission from gallium oxide (Ga₂O₃) nanoparticles doped with liquid Ga nanodots, which are fabricated by using a laser‐induced oxidation method is reported. The quantum efficiency of Ga/Ga₂O₃ hybrid nanoparticles is found to be ≈1.3%, which is nearly two orders of magnitude larger than that of liquid Ga nanoparticles. It is revealed that the existence of Schottky barrier and hotspots in Ga/Ga₂O₃ nanoparticles plays a crucial role in enhancing the quantum efficiency. As an example of practical applications, high‐quality optical data storage is demonstrated by exploiting the controllable formation of Ga/Ga₂O₃ nanoparticles on a platform of disordered Ga nanoislands. These results suggest the potential applications of Ga/Ga₂O₃ hybrid nanoparticles in the development of nanoscale light sources and data storage devices.