Patent ID: 7649310

Claim:
A white LED comprising: an ultraviolet emitting diode or a purple light emitting diode; and phosphors for emitting visible lights including blue light, green light and red light; wherein an emission spectrum of said white LED has: a first luminescence peak in a blue light region having a wavelength of 440-460 nm; a second luminescence peak in a green light region having a wavelength of 510-530 nm; and a third luminescence peak in a red light region having a wavelength of 620-640 nm, wherein said phosphor for emitting blue color light is an europium activated halo-phosphate phosphor expressed by a general formula 1: (Sr 1-x-y Ba x Ca y Eu z ) 10 (PO 4 ) 6 .Cl 2 in which x, y, z respectively satisfy the relations x<0.2, y<0.1 and 0.005<z<0.1, wherein said phosphor for emitting green color light is an europium and manganese activated aluminate phosphor expressed by a general formula 2: (Ba 1-x-y-z Sr x Ca y Eu z ) (Mg 1-u Mn u ) Al 10 O 17 in which x, y, z, u respectively satisfy the relations x<0.5, y<0.1, 0.15<z<0.4 and 0.3<u<0.6, and wherein said phosphor for emitting red color light is an europium activated lanthanum oxysulfide phosphor expressed by a general formula 3: (La 1-x-y Eu x M y ) 2 O 2 S in which M is at least one element selected from Sb and Sn, and x, y respectively satisfy the relations 0.01<x<0.15, and y<0.03.