Solid state lighting devices without converter materials and associated methods of manufacturing

摘要

Solid state lighting devices that can produce white light without a phosphor are disclosed herein. In one embodiment, a solid state lighting device includes a first semiconductor material, a second semiconductor material spaced apart from the first semiconductor material, and an active region between the first and second semiconductor materials. The active region includes a first sub-region having a first center wavelength and a second sub-region having a second center wavelength different from the first center wavelength.

主权项

1. A solid state lighting (SSL) device comprising:
a substrate material; a first semiconductor material on the substrate material; a second semiconductor material spaced apart from the first semiconductor material; an active region between the first and second semiconductor materials, the active region having a first sub-region and a second sub-region proximate the first sub-region, wherein the first sub-region is configured to produce a first emission and the second sub-region is configured to produce a second emission different then the first emission, and wherein—
the first sub-region includes a first plurality of InGaN materials having a first indium concentration,the second sub-region includes a second plurality of InGaN materials having a second indium concentration, andat least one of the first indium concentration and the second indium concentration increases or decreases along a thickness direction of the respective sub-region,wherein at least one of the first sub-region and the second sub-region comprises an InGaN bulk material.