The approach to adapt upconversion nanoparticles to plasmonic structures has been studied to improve their inherent low quantum efficiency. However, the metal-based plasmonic structures have limits in extending their applications since they are rigid and opaque. In this study, we demonstrate a plasmonic film composed of an array of microbeads, which provides transferability and flexibility as well as distinctive upconversion luminescence enhancement. Our proposed structure comprises plasmonic silver nanoparticle-decorated silica microbeads on the dielectric-metal substrate, thereby providing remarkable improvements in absorption efficiency of near-infrared (NIR) light, and emission of visible (Vis) light via resonance mode excitation. As a result, the observed upconversion luminescence intensity exhibited three-order enhancement compared to reference under low power excitation. In addition, transparency and wide viewing angle property of emitted light for our film further extend its applicability for various fields such as absorption enhancement of photovotaics through visible light conversion in NIR and attachable NIR detection film.
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