Photon energy conversion via localized surface plasmons in ZnO/Ag/ZnO nanostructures

► We demonstrate great enhancement of visible light emission in ZnO/Ag/ZnO nanostructures. ► The enhancement originates from localized surface plasmon of Ag islands. ► The enhancement are influenced by Ag island sizes and ZnO capping layer. ► The experimental results can be interpreted with theoretical calculation.