Patent ID: 7423296
Filing Date: 2008-09-09
Classification: H01L

Abstract:
1. A lighting device, comprising: a semiconductor light emitting device providing a source light; and a first thin-film luminescent material layer coating a surface of the semiconductor light emitting device, the first thin-film luminescent material layer including a luminescent material emitting an emitted light in response to the source light, the first thin-film luminescent material layer having a specific and consistent thickness and specific and consistent density of luminescent particles; wherein the specific and consistent thickness of the first thin-film luminescent material layer is selected to generate composite light having a desired color; the lighting device further comprising a second thin-film luminescent material layer coating a surface of the first thin-film luminescent material layer, the second thin-film luminescent material layer including luminescent material emitting an emitted light in response to the emitted light from the first thin film luminescent material layer, the second thin-film luminescent material layer having a specific and consistent thickness and specific and consistent density of luminescent particles; wherein the specific and consistent thickness of the first thin-film luminescent material layer and the specific and consistent thickness of the second thin-film luminescent material layer are selected to generate the composite light having a desired color appearance.