The present invention relates to, inter alia, a composition, a nanocomposite material, and a method for preparing the nanocomposite material. The nanocomposite material includes: a dielectric-silver nanocomposite material, the dielectric-silver nanocomposite material including a silver nanoparticle having a silver ion, and a dielectric material encapsulating the silver nanoparticle, where the silver ion chelates with a matrix of the dielectric material, and a surface plasmon band absorption of the dielectric-silver nanocomposite material lies outside a range of a visible region.