Fluoride phosphor composite, method of manufacturing fluoride phosphor composite, white light emitting apparatus, display apparatus, lighting device, and electronic device

A fluoride phosphor composite comprising:

• a fluoride phosphor core particle expressed by an empirical formula of AxMFy:Mn4+,
• wherein, in the empirical formula, A is at least one selected from the group consisting of Li, Na, K, Rb, and Cs, M is at least one selected from the group consisting of Si, Ti, Zr, Hf, Ge, and Sn, a composition ratio (x) of A satisfies 2≦x≦3, a composition ratio (y) of F satisfies 4 ≦Y≦7,
• the fluoride phosphor core particle is coated with a Mn-free fluoride coating, and the Mn-free fluoride coating has a thickness less than or equal to 35% of the size of the fluoride phosphor composite,
• wherein, an external quantum efficiency of the fluoride phosphor composite is equal to or greater than 80% of an initial external quantum efficiency when the fluoride phosphor composite is excited with a light having a wavelength equal to about 450 nm after the fluoride phosphor composite is preserved in an environment having a temperature equal to about 85° C. and relative humidity equal to about 85% for 15 hours.