SILICATE PHOSPHOR AND PROCESS FOR MANUFACTURING SAME

摘要

Provided are a blue phosphor and a method of easily producing the phosphor, the phosphor being excited at a wavelength of about 400 nm, which is an emission wavelength of a near-ultraviolet LED, to emit high-intensity light and having a small change of emission intensity due to a change of an excitation wavelength. The phosphor is silicate phosphor that is represented by a composition formula of Ba 1-x Eu x ZrSi y O 3+2y (where 0.001‰¤x‰¤0.5 and 2.5‰¤y‰¤3); has a diffraction pattern of BaZrSi 3 O 9 as a powder X-ray diffraction pattern; has an emission intensity at an excitation wavelength of 400 nm, the emission intensity being 40% or higher of an emission intensity at an excitation wavelength of 300 nm; and has an emission intensity change ratio represented by (I ex 380nm -I ex 420nm )/I ex 380nm ×100, emission intensity change ratio being 30% or lower in a range of excitation wavelengths of 380 nm to 420 nm.