Phosphor, light source and LED
AssigneeDowa Mining Co., Ltd.
InventorsAkira Nagatomi, Kenji Sakane, Masahiro Gotoh, Shuji Yamashita
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Abstract
A phosphor with high efficiency having an excitation band corresponding to light of the ultraviolet-visible (300 to 550 nm) wavelength region emitted from a light emitting portion which emits blue or ultraviolet light is provided. A nitride of Ca, a nitride of Al, a nitride Si, and an oxide of Eu are prepared, and respective raw materials are weighed so that a mol ratio of respective elements becomes Ca:Al:Si:Eu=0.985:3:1:0.015, mixed under a nitrogen atmosphere, and thereafter fired at 1500° C. in a nitrogen atmosphere to thereby produce a phosphor having a composition formula Ca0.985SiAlN3:Eu0.015.
Claims15
A phosphor represented by a general formula M—A—B—N:Z,
- wherein the element M is a divalent element, the element A is a trivalent element, the element B is a tetravalent element, the N is nitrogen, and the element Z is an activator in the phosphor, and
- wherein the phosphor is represented by a composition formula MmAaBbNn:Zz, the phosphor having a composition ratio being (m+z):a:b:n=1:1:1:3.
Dependencies are inferred from the claim text.