# US 8,148,742 B2 · Type II broadband or polychromatic LEDs

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- Number: US 8,148,742 B2
- Document ID: US8148742B2
- Status: Granted
- Kind: B2
- Application number: 12/748,956
- Filed: 2010-03-29
- Published: 2010-07-22
- Granted: 2012-04-03
- Earliest claimed: 2004-12-09
- Assignees: 3M Innovative Properties Company
- Inventors: Thomas J. Miller; Michael A. Haase
- Web page: https://patentgrep.com/patent/US8148742B2

## CPC

- H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures
- H10H 20/823: comprising only Group II-VI materials, e.g. ZnO
- 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: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

An LED is provided comprising two or more light-emitting Type II interfaces wherein at least two of the Type II interfaces differ in transition energy by at least 5%, or more typically by at least 10%, and wherein at least one of the Type II interfaces is within a pn junction. Alternately, an LED is provided comprising two or more light-emitting Type II interfaces wherein at least two of the Type II interfaces differ in transition energy by at least 5%, or more typically by at least 10%. The Type II interfaces may include interfaces from a layer which is an electron quantum well and not a hole quantum well, interfaces to a layer which is a hole quantum well and not an electron quantum well; and interfaces that satisfy both conditions simultaneously. The Type II interfaces may be within a pn or pin junction or not within a pn or pin junction. In the later case, emission from the Type II interfaces may be photopumped by a nearby light source. The LED may be a white or near-white light LED. In addition, graphic display devices and illumination devices comprising the semiconductor device according to the present invention are provided.

## Claims

### Claim 1

An LED comprising two or more Type II interfaces wherein at least two of said two or more Type II interfaces differ in transition energy by at least 5%, wherein a first Type II interface of said two or more Type II interfaces has a first transition energy corresponding to yellow, green, blue or violet wavelength visible light, and wherein a second Type II interface of said two or more Type II interfaces has a second transition energy corresponding to red, orange or yellow wavelength visible light.

### Claim 2 (depends on 1)

The LED according to claim 1 wherein at least two of said two or more Type II interfaces differ in transition energy by at least 10%.

### Claim 3 (depends on 1)

A graphic display device comprising the LED according to claim 1.

### Claim 4 (depends on 1)

An illumination device comprising the LED according to claim 1.

### Claim 5 (depends on 1)

The LED according to claim 1, wherein at least one of the Type II interfaces comprises a II-VI alloy.