SEMICONDUCTOR NANOPARTICLE PHOSPHOR INCLUDING NANOPARTICLE CORE COMPOSED OF GROUP-XIII AND -XV SEMICONDUCTOR AND FIRST SHELL AND SECOND SHELL FOR COATING THE SAME

A semiconductor nanoparticle phosphor includes a nanoparticle core composed of a group-XIII and -XV semiconductor, a first shell for coating the nanoparticle core, and a second shell for coating the first shell, a difference in a lattice constant between the nanoparticle core and the second shell being smaller than a difference in the lattice constant between the nanoparticle core and the first shell, or the first shell being smaller in the lattice constant than the nanoparticle core and the second shell being greater in the lattice constant than the nanoparticle core, or the first shell being greater in the lattice constant than the nanoparticle core and the second shell being smaller in the lattice constant than the nanoparticle core.