Patent ID: 7936418

Claim:
A white light-emitting device, comprising: a semiconductor light-emitting element emitting ultraviolet light or violet light; and a light-emitting unit, which is excited by the light from the semiconductor light-emitting element to emit white light, including three or more kinds of visible light-emitting phosphors, including a blue light-emitting phosphor, a green light-emitting phosphor, and a red light-emitting phosphor, wherein emission spectrum of the light-emitting unit has peaks in a blue region of not less than 440 nm nor more than 460 nm, a green region of not less than 510 nm nor more than 530 nm, and a red region of not less than 620 nm nor more than 640 nm, and the three or more kinds of visible light-emitting phosphors are bound together with a binder in advance, wherein the blue light-emitting phosphor comprises a europium-activated halo-phosphate phosphor having a composition which is represented by the general formula: (Sr 1-x-y Ba x Ca y Eu z ) 10 (PO 4 ) 6 .Cl 2 (where, x, y and z are numbers satisfying x<0.2, y<0.1, 0.005<z<0.1), wherein the green light-emitting phosphor comprises a europium and manganese-activated aluminate phosphor having a composition which is represented by the general formula: (Ba 1-x-y-z Sr x Ca y Eu z )(Mg 1-u Mn u )Al 10 O 17 (where, x, y and z are numbers satisfying x<0.5, y<0.1, 0.15<z<0.4, 0.3<u<0.6), wherein the red light-emitting phosphor comprises a europium-activated lanthanum oxysulfide phosphor having a composition which is represented by the general formula: (La 1-x-y Eu x M y ) 2 O 2 S (where, M shows at least one of element selected from Sb and Sn, and x and y are numbers satisfying 0.01<x<0.15, y<0.03), wherein the visible light-emitting phosphors include 10 mass % to 30 mass % of the blue light-emitting phosphor, 10 mass % to 30 mass % of the green light-emitting phosphor, and 50 mass % to 80 mass % of the red light-emitting phosphor.