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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements numbered alike in several figures, in which: FIG. 1 shows a schematic diagram of a double jet reactive crystallization apparatus.

Claims

1. 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.

2. The core/shell type particle phosphor of claim 1, wherein a value of B/A is 10-100, provided that a CL (cathodeluminescence) intensity ratio of the core particle phosphor to the core/shell type particle phosphor, {CL intensity(core)/CL intensity(core/shell)}, is represented by B.

3. The core/shell type particle phosphor of claim 1, wherein the particle diameter is 1-10 nm.

4. The core/shell type particle phosphor of claim 2, wherein the particle diameter is 1-10 nm.