Patent ID: 7564065
Filing Date: 2009-07-21
Classification: C04B,C09K,H01L,H05B

Abstract:
1. A light emitting device comprising: a semiconductor light emitting element that emits purplish blue or blue light, and a phosphor that absorbs part or all of the light emitted from said semiconductor light emitting element and emits fluorescence having a different wavelength from the wavelength of said light, wherein said phosphor is a mixture of X percent of a first phosphor material that emits yellow green, yellow or yellow orange light and Y percent of a second phosphor material that emits light having a color of yellow orange or orange and a longer dominant wavelength than said first phosphor material, said first and said second phosphor material being mixed in a manner that satisfy all the following relations 0<X≦100, 0≦Y<100, and 0<(X+Y)≦100, and wherein said first phosphor material is a SiAlON phosphor represented by a general formula Ca wherein said second phosphor material is a nitride red phosphor represented by a general formula Ca