[Problem] The purpose of the present invention is to provide a novel optical functional material in which silver nanoparticles are used. [Solution] According to the present invention, a ternary composite formed by mixing silver nanoparticles, an organic semiconductor, and a clay in a liquid phase is provided. The organic semiconductor is preferably an organic charge-transfer complex, and more preferably a charge-transfer boron polymer. The clay is a layered silicate mineral, and preferably smectite. The present invention also provides an antibacterial agent, a photoelectric converter, and a photosensitive pointing device using the ternary composite.
