Core/shell type particle phosphor

Abstract

An objective is to provide a core/shell type particle phosphor exhibiting an optimal excitation wavelength for fluorescence observation and excellent emission luminance of PL, together with excellent durability, to which particles are produced so as to be suitable for the field of bio-nanotechnology. Disclosed is a core/shell type particle phosphor comprising a core particle phosphor and coated thereon, a shell made of a metal compound having a different composition from a composition constituting the core particle phosphor, wherein the core particle phosphor is a particle phosphor prepared by baking a precursor synthesized via a reactive crystallization method, satisfying a PL (photoluminescence) intensity ratio A of the core particle phosphor to the core/shell type particle phosphor, {PL intensity(core)/PL intensity(core/shell)}; 0.001≦A≦0.1, and a core/shell type particle diameter of at most 0.1 μm.

Dependencies are inferred from the claim text.