# US 10,483,318 B2 · Solid state lighting devices with opposing emission directions

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- Number: US 10,483,318 B2
- Document ID: US10483318B2
- Status: Granted
- Kind: B2
- Application number: 15/896,805
- Filed: 2018-02-14
- Published: 2019-08-15
- Granted: 2019-11-19
- Earliest claimed: 2018-02-14
- Assignees: Cree, Inc.
- Applicants: Cree, Inc.
- Inventors: Peter Scott Andrews; Christopher P. Hussell
- Web page: https://patentgrep.com/patent/US10483318B2

## CPC

- H01L 27/153
- H01L 33/50
- H01L 33/502
- H01L 33/507
- H01L 33/60
- H01L 33/62
- H01L

## Abstract

Solid-state lighting devices, for example, light-emitting diodes (LEDs), which include a primary light-extraction face and a secondary light-extraction face that generally opposes the primary light-extraction face are disclosed. In some embodiments, mirrors internal to the LED may be omitted, and omnidirectional light from the active region is allowed to freely exit the primary light-extraction face and the secondary light-extraction face. In other embodiments, the first light-extraction face and second light-extraction face include opposing sidewalls of an LED. In such embodiments, mirrors internal to the LED may be utilized to direct omnidirectional light from the active region toward the first light-extraction face and the second light-extraction face.

## Claims

### Claim 1

A solid-state lighting device comprising:
a primary light-extraction face and a secondary light-extraction face that generally opposes the primary light-extraction face;
a plurality of light-emitting diodes (LEDs) supported by a light-transmissive submount;
at least one light-segregation element positioned between different LEDs of the plurality of LEDs proximate to the primary light-extraction face; and
at least one lumiphoric material arranged between different LEDs of the plurality of LEDs registered with the at least one light-segregation element, wherein the at least one lumiphoric material is arranged between the at least one light-segregation element and the secondary light-extraction face.

### Claim 2 (depends on 1)

The solid-state lighting device of claim 1 wherein light emitted by the plurality of LEDs is extracted from both the primary light-extraction face and the secondary light-extraction face.

### Claim 3 (depends on 1)

The solid-state lighting device of claim 1 wherein the plurality of LEDs comprises a plurality of discrete LED chips.

### Claim 4 (depends on 1)

The solid-state lighting device of claim 1 wherein the at least one light-segregation element comprises a reflective material.

### Claim 5 (depends on 1)

The solid-state lighting device of claim 1 wherein the plurality of LEDs comprises a plurality of active regions arranged on or over a monolithic substrate.

### Claim 6 (depends on 1)

The solid-state lighting device of claim 1 wherein the at least one light-segregation element comprises an unfilled void.

### Claim 7 (depends on 1)

The solid-state lighting device of claim 1 wherein each LED of the plurality of LEDs is independently controllable.

### Claim 8 (depends on 1)

The solid-state lighting device of claim 1 further comprising a support element configured to support the light-transmissive submount.

### Claim 9 (depends on 8)

The solid-state lighting device of claim 8 wherein the support element is configured to be a display that outputs an image that is viewable from two opposing sides.

### Claim 10 (depends on 8)

The solid-state lighting device of claim 8 wherein the support element is configured to be a suspended lighting fixture that outputs light in two opposing directions.