# US 5,349,209 A · Diamond/organic LED

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- Number: US 5,349,209 A
- Document ID: US5349209A
- Status: Granted
- Kind: A
- Application number: 07/921,773
- Filed: 1992-07-30
- Granted: 1994-09-20
- Earliest claimed: 1992-07-30
- Assignees: Motorola, Inc.
- Inventors: Curtis D. Moyer; Thomas B. Harvey, III; James E. Jaskie
- Web page: https://patentgrep.com/patent/US5349209A

## CPC

- H10K 50/171: {Electron injection layers}
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A light emitting diode including a carrier injection layer of semiconductor material, such as diamond, and a light emitting layer of electroluminescent organic material, such as PPV, positioned to form a diode junction therebetween. The semiconductor material being selected to have a wider bandgap than the organic material and the materials being further selected to minimize the discontinuities at the junction which would cause energy spikes.

## Claims

### Claim 1

A diamond/organic light emitting diode comprising:
a layer of polycrystalline diamond; and
a layer of electroluminescent organic material positioned on a surface of the layer of polycrystalline diamond and forming a junction therebetween, the layer of polycrystalline diamond serving as a carrier injection layer and the layer of electroluminescent organic material emitting light in response to injection of carriers therein.

### Claim 2

A diamond/organic light emitting diode comprising:
an electron injection layer including polycrystalline N-type diamond; and
a light emitting layer including a P-type electroluminescent organic material positioned on a surface of the electron injection layer and forming a junction therebetween.

### Claim 3 (depends on 2)

A diamond/organic light emitting diode as claimed in claim 2 wherein the P-type electroluminescent organic material of the light emitting layer includes 8-hydroxyquinoline aluminum.

### Claim 4 (depends on 2)

A diamond/organic light emitting diode as claimed in claim 2 wherein the P-type electroluminescent organic material of the light emitting layer includes a conjugated polymer.

### Claim 5 (depends on 4)

A diamond/organic light emitting diode as claimed in claim 4 wherein the conjugated polymer includes poly(2-methoxy, 5-(2'-ethyl-hexoxy)-1, 4-phenylene-vinylene).

### Claim 6 (depends on 2)

A diamond/organic light emitting diode as claimed in claim 2 wherein the light emitting layer is positioned on a (100) surface of the polycrystalline N-type diamond.

### Claim 7 (depends on 2)

A diamond/organic light emitting diode as claimed in claim 2 wherein the light emitting layer is positioned on a (111) surface of the polycrystalline N-type diamond.