White light emitting device with particular light emitting structure
AssigneeFoxsemicon Integrated Technology, Inc.
InventorChih-Ming Lai
Life of this patent
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Abstract
A white light emitting device and a method for making the same are provided. The white light emitting device includes a light emitting diode (LED) chip, a fluorescent layer and a reflective layer. The LED chip includes a substrate and a light emitting structure formed on the substrate. The LED chip has a plurality of side walls. The light emitting structure includes a first-type semiconductor layer, an active layer and a second-type semiconductor layer arranged in that order along a direction away from the substrate. The substrate has through hole formed therethrough and the first-type semiconductor layer is partially exposed. The fluorescent layer is formed in the through hole for wavelength conversion. The reflective layer is formed on the side walls and surrounds the LED chip.
Claims14
A white light emitting device, comprising:
- a light emitting diode chip including a substrate and a light emitting structure formed on the substrate, the light emitting diode chip having a plurality of side walls, wherein the light emitting structure comprises a first-type semiconductor layer, an active layer and a second-type semiconductor layer arranged in that order along a direction away from the substrate, the first-type semiconductor layer and the second-type semiconductor layer have opposite conductive types with respect to each other, the substrate has a through hole formed therethrough and the first-type semiconductor layer is partially exposed;
- a fluorescent layer formed in the through hole for being excited to emit white light;
- and
- a reflective layer formed on the side walls and surrounding the light emitting diode chip.
A white light emitting device comprising:
- a substrate defining a through hole therein;
- a first-type semiconductor layer formed on the substrate, the first-type semiconductor layer having a surface proximate to the substrate, the surface having a central portion exposed through the through hole and a peripheral portion covered by the substrate and surrounding the central portion;
- an active layer formed on the first-type semiconductor layer;
- a second-type semiconductor layer formed on the active layer;
- a fluorescent layer formed on the first-type semiconductor layer in the through hole for being excited to emit white light;
- and
- a reflective layer enclosing the first-type semiconductor layer, the active layer and the second-type semiconductor layer therein.
A light emitting device, comprising:
- a solid-state light emitting chip including a substrate and a light emitting structure epitaxially grown on the substrate, the substrate having a through hole and the light emitting structure partially exposed through the through hole;
- a fluorescent layer received in the through hole;
- and
- a reflective layer surrounding the solid-state light emitting chip therein.
Dependencies are inferred from the claim text.