Phosphor
A phosphor includes particles having an average particle size of from 10 nm to 2 μm, wherein 90% by mass or more of all of the particles have particle sizes within ±30% of the average particle size and a ratio of particles having no corners to all of the particles is 80% or more in number.
1. A phosphor comprising particles having an average particle size of from 10 nm to 2 μm, wherein 90% by mass or more of all of the particles have particle sizes within ±30% of the average particle size and a ratio of particles having no corners to all of the particles is 80% or more in number,
wherein the phosphor is produced by a precipitation process of synthesizing a precursor of the phosphor by a liquid phase process in the presence of a protective colloid, wherein the amount of the protective colloid is from 2.5% to 15%, and
wherein the phosphor is Zn 2 SiO 4 :Mn 2+ .
2. The phosphor of claim 1 , wherein the average particle size of the particles is from 10 nm to 500 nm.
3. The phosphor of claim 1 , wherein the particle having no corners is a spherical particle or a particle obtained by fusing a plurality of spherical particles.
4. The phosphor of claim 1 , wherein the phosphor is formed by using colloidal silica.
5. The phosphor of claim 1 , wherein a precursor of the phosphor is spherical.
6. The phosphor of claim 1 , wherein said protective colloid is selected from the group consisting of gelatin, albumin, egg albumin, and casein.
7. The phosphor of claim 1 wherein said protective colloid is a protein.