Patent ID: 8710532
Filing Date: 2014-04-29
Classification: C09K,H01L,Y02B

Abstract:
1. A white light emitting lamp comprising: a semiconductor light emitting element which is placed on a board and emits ultraviolet light or blue light; and a light emitting portion that is formed so as to cover a light emitting surface of the semiconductor light emitting element, the light emitting portion containing a blue phosphor, a green phosphor, a red phosphor and a deep red phosphor that are excited by the light emitted from the semiconductor light emitting element to respectively emit blue light, green light, red light and a deep red light, the white light emitting lamp emitting white light by mixing light emission colors from the blue phosphor, the green phosphor, the red phosphor and a deep red phosphor with one another, wherein the deep red phosphor has a main emission peak in a longer wavelength region than a main emission peak of the red phosphor, said red phosphor comprises at least one component selected from: a europium-activated SiAlON phosphor having a composition expressed by a general formula of: in which x, α, β, γ, δ and ω satisfy the following relations 0<x<1, 0<α≦3, 5≦β≦9, 1≦γ≦5, 0.5≦δ≦2 and 5≦ω≦15; and a europium-activated CASN phosphor having a composition expressed by a general formula of: in which x and y satisfy the following relations 0<x<1, 0<y<0.2, 0<x+y<1; and wherein said deep red phosphor comprises a manganese-activated magnesium florogermanate phosphor having a composition expressed by a general formula of: in which α, β and x satisfy the following relations 3.0≦α≦4.0, 0.4≦β≦0.6, 0.001≦x≦0.5.