Patent ID: 7972694

Claim:
Triple-layered semiconductor nanoparticles comprising a core layer, an intermediate layer and a shell layer and having an average particle diameter of 2 to 50 nm, the core, intermediate and shell layers being formed of different crystals, a crystal forming the shell layer having a band gap greater than that of a crystal forming the core layer, and a lattice constant of a crystal forming the intermediate layer being a value falling between a lattice constant of the crystal forming the core layer and that of the crystal forming the shell layer wherein when a composition of the crystal forming the core layer is represented by AB and a composition of the crystal forming the shell layer is represented by CB, a composition of the crystal forming the intermediate layer is represented by A x C 1-x B, wherein A, B, and C are different elements; and X is a value falling within a range of 0<X<1.