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Metal nanoparticles separated by nanogap spacings generate a significantly enhanced electromagnetic field caused by the light-induced localized surface plasmon resonance. This enhanced electromagnetic field, so-called a hot spot, amplifies the optical absorption and emission of dye molecules in nanogaps. In this study, we fabricated large-area plasmonic Au nanogap arrays with highly integrated hotspots by utilizing the spontaneous nanophase separation of block copolymers. These arrays showed the amplification of upconversion emission based on solid-state triplet-triplet annihilation (TTA-UC).
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