# US 2014/0151736 A1 · High-power white leds

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0151736 A1
- Document ID: US20140151736A1
- Status: Published application
- Kind: A1
- Application number: 14/172,308
- Filed: 2014-02-04
- Published: 2014-06-05
- Earliest claimed: 2006-11-17
- Assignees: Rensselaer Polytechnic Institute
- Applicants: Rensselaer Polytechnic Institute
- Inventors: Nadarajah Narendran; Yimin Gu
- Web page: https://patentgrep.com/patent/US20140151736A1

## CPC

- H10H 20/8506: {Containers}
- H10H 20/813: having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies
- H10H 20/8512: {Wavelength conversion materials}
- H10H 20/8513: {having two or more wavelength conversion materials}
- H10H 20/8514: {characterised by their shape, e.g. plate or foil}
- H10H 20/8515: {not being in contact with the bodies}
- H10H 20/855: Optical field-shaping means, e.g. lenses
- H10H 20/854: characterised by their material, e.g. epoxy or silicone resins
- H10H 20/882: {Scattering means (H10H20/82 takes precedence)}
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A light emitting apparatus has a radiation source for emitting short wavelength radiation. A down conversion material receives and down converts at least some of the short wavelength radiation emitted by the radiation source and back transfers a portion of the received and down converted radiation. An optic device adjacent the down conversion material at least partially surrounds the radiation source. The optic device is configured to extract at least some of the back transferred radiation. A sealant substantially seals a space between the radiation source and the optic device.

## Claims

### Claim 1

A light emitting apparatus comprising:
a first radiation source;
a second radiation source having a dimension smaller than that of the first radiation source;
an optic device comprising a top surface distal the radiation sources, a bottom surface proximal the radiation sources, and a transparent sidewall extending between the top surface and the bottom surface; and
a down conversion material disposed adjacent to or on the top surface and extending from the transparent sidewall.

### Claim 2 (depends on 1)

The light emitting apparatus of claim 1, further comprising an aperture between the optic device and the radiation sources.

### Claim 3 (depends on 1)

The light emitting apparatus of claim 1, further comprising a sealant between the optic device and the radiation sources.

### Claim 4 (depends on 3)

The light emitting apparatus of claim 3, wherein the sealant has a refractive index of 1.5-2.3.

### Claim 5 (depends on 1)

The light emitting apparatus of claim 1, wherein one of the first radiation source and the second radiation source has a dimension about 1 mm.

### Claim 6 (depends on 1)

The light emitting apparatus of claim 1, wherein at least one of the first radiation source and the second radiation source is not encapsulated by a dome.

### Claim 7 (depends on 1)

The light emitting apparatus of claim 1, wherein the bottom surface has a width smaller than that of the top surface.

### Claim 8 (depends on 1)

The light emitting apparatus of claim 1, wherein the down conversion material comprises a single phosphor or multiple phosphors.

### Claim 9

A light emitting apparatus comprising:
a first radiation source without a dome;
an optic device having a height smaller than 20 mm, and comprising a top surface distal the first radiation source, a bottom surface proximal the first radiation sources, and a transparent sidewall extending between the top surface and the bottom surface;
a lens; and
a down conversion material between the lens and the radiation source.

### Claim 10 (depends on 9)

The light emitting apparatus of claim 9, further comprising a second radiation source having a dimension smaller than that of the first radiation source.

### Claim 11 (depends on 9)

The light emitting apparatus of claim 9, further comprising a sealant between the optic device and the first radiation source.

### Claim 12 (depends on 11)

The light emitting apparatus of claim 11, wherein the sealant has a refractive index of 1.5-2.3.

### Claim 13 (depends on 9)

The light emitting apparatus of claim 9, wherein the optic device has a refractive index of 1.4-1.7.

### Claim 14 (depends on 9)

The light emitting apparatus of claim 9, wherein the bottom surface has a width smaller than that of the top surface.

### Claim 15 (depends on 9)

The light emitting apparatus of claim 9, wherein the transparent sidewall comprises a straight portion, a curved portion, or both thereof.