Synthesis of Metal–Quantum Dot Core–Satellite Nanoparticles and Plasmonic Cavity-Induced Recovery of Quantum Yield for High External Quantum Efficiency

Quantum dots (QDs) have been extensively studied for their unique optical and electronic properties arising from quantum confinement. In particular, less toxic and environment-friendly InP/ZnSe/ZnS QDs have been successfully commercialized in display devices, but their low absorption characteristic still limits external quantum efficiency (EQE). As multidirectional structural engineering has brought internal quantum yield (QY) close to unity, further improvements in EQE now depend on enhancing light absorption, often achieved via photonic cavities integrated with plasmonic materials. However, optical interactions between plasmonic cavities and InP-based QDs remain largely unexplored to fully exploit the potential, primarily due to their nonunified decay dynamics and the synthetic difficulty of establishing consistent photonic environments across all emitters. Here, we present a silanol-a…