Patent ID: 8597543
Filing Date: 2013-12-03
Classification: C09K,H01L,Y02B

Abstract:
1. A light emitting device, comprising: a light emitting element configured to emit light at a wavelength in a range of about 380 nm to about 470 nm; and a phosphor configured to absorb at least some of the light emitted from the light emitting element, wherein the phosphor emits light having a maximum emission wavelength in a range of about 500 to about 700 nm; wherein the full width at half maximum of the light emitted from the phosphor is in a range of about 120 to about 200 nm; and wherein the phosphor comprises a compound having a CaAlSiN wherein the phosphor comprises a single crystal phosphor preform attached to the light emitting element, the single crystal phosphor preform comprising a single crystal of a material having a compound of Formula I: wherein A comprises one or more elements selected from the group consisting of Ca, Sr, Ba, Mg, Y, Hf, the lanthanide elements and the other alkaline earth metals; B comprises Eu and Ce; C comprises one or more tetrahedrally-coordinated trivalent elements; D comprises one or more tetrahedrally-coordinated tetravalent elements; E comprises one or more elements selected from the group consisting of N, O, F, C, S, Cl, Br and I, wherein a+b=1 and c+d=2,and e is in a range of 2.5 to 3.5.