Patent ID: 7474050
Filing Date: 2009-01-06
Classification: G02F,H01L

Abstract:
1. A light emitting device comprising: at least one light source; at least one first emitting section having at least one sort of luminescent material that emits light including a wavelength component that is longer than that of the light emitted from said light source when excited by the light emitted from said light source; at least one second emitting section having at least one sort of luminescent material that emits light including a wavelength component that is longer than that of the light emitted from said first emitting section when excited by the light emitted from said light source and said first emitting section; and at least one light exit side out of which the light emitted from said light source, said first light-emitting section and said second light-emitting section emerges to the outside; wherein said first emitting section and said second emitting section are opened at said light exit side, and the area of the boundary surface between said first emitting section and said second emitting section is equal to or less than fifty percent of the surface area of said first emitting section, wherein the light exit side of the opened part of the first emitting section emits to the outside in a predetermined direction light of a wavelength corresponding the wavelength of the light source and of a wavelength corresponding to the light emitted by the first emitting section; and wherein the light exit side of the opened part of the second emitting section emits to the outside in the predetermined direction light of a wavelength corresponding the wavelength of the light source, of a wavelength corresponding to the light emitted by the first emitting section, and of a wavelength corresponding to the light emitted by the second emitting section.