Light emitting devices for light conversion and semiconductor chips for fabricating the same
AssigneeCree, Inc.
InventorPeter S. Andrews
Life of this patent
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Abstract
Broad spectrum light emitting devices and methods and semiconductor chips for fabricating such devices include a light emitting element, such as a diode or laser, which emits light in a predefined range of frequencies. The light emitting element includes a shaped substrate suitable for light extraction through the substrate and a cavity in the substrate proximate the light emitting element. For example, a trench adjacent the light emitting element may be provided. The cavity/trench is configured to contain light conversion material such that light extracted from sidewalls of the cavity/trench passes through the light conversion material contained in the cavity/trench. Methods of fabricating such devices and/or chips are also provided.
Claims17
A light emitting device, comprising:
- a substrate;
- a semiconductor light emitting element on the substrate, the semiconductor light emitting element including a first surface and a second surface that is opposite the first surface;
- and
- at least one trench in the substrate proximate the light emitting element, the trench having at least two sidewalls that do not extend beyond either of the first surface or the second surface of the light emitting element;
- and
- a light conversion material in the trench,
- wherein one of the at least two sidewalls is a tapered sidewall, and
- wherein at least an outside one of the at least two sidewalls of the trench surrounds the light emitting element in plan view.
A device, comprising:
- a cavity including at least two sidewalls;
- a light emitting element proximate and outside the cavity, the light emitting element including a first surface and a second surface that is opposite the first surface, wherein the sidewalls of the cavity do not intersect either of an extension in any direction of a plane defined by the first surface of the light emitting element or an extension in any direction of a plane defined by the second surface of the light emitting element;
- and
- a light conversion material in the cavity,
- wherein one of the at least two sidewalls is a tapered sidewall, and
- wherein at least an outside one of the at least two sidewalls of the cavity surrounds the light emitting element in plan view.
Dependencies are inferred from the claim text.