Method for manufacturing coated phosphor, and coated phosphor

A method for manufacturing a coated phosphor in which a phosphor is coated with a coating material comprising:

• a mixing step of mixing the phosphor with the coating material in a solvent to form a mixed solution;
• and
• a separation step of separating the mixed solution into a solid phase and a liquid phase, wherein
• the phosphor contains barium (Ba), strontium (Sr), europium (Eu), silicon (Si) and oxygen (O) at an atomic ratio represented by compositional formula (1), and
• the mass ratio of the phosphor to the coating material is 40:260 to 200:260,
• [(Ba1-ySry)1-xEux]aSibOc compositional formula (1)
• wherein a, b, c, x and y satisfy the relationships:
• 2.7<a<3.3, 0.9<b<1.1, 4.5<c<5.5, 0<x<0.09 and 0.25<y<0.75,
• wherein the uncoated phosphor has a specific surface area equal to or more than 2 m2/g, and
• the coating material is an alkylsilane compound.