# US 2014/0197390 A1 · Organic light emitting device with improved light extraction

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- Number: US 2014/0197390 A1
- Document ID: US20140197390A1
- Status: Published application
- Kind: A1
- Application number: 14/118,280
- Filed: 2012-05-23
- Published: 2014-07-17
- Earliest claimed: 2011-05-25
- Assignees: Koninklijke Philips N.V.
- Inventors: Jan Frank Strömer; Marcus Antonius Verschuuren
- Web page: https://patentgrep.com/patent/US20140197390A1

## CPC

- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

The invention provides an organic light-emitting device (OLED) comprising: a transparent substrate; a first, transparent electrode layer arranged on said substrate; one or more organic light-active layers arranged on said first electrode layer; a second electrode layer arranged on said one or more organic light-active layers; and a discontinuous layer comprising discrete, randomly distributed nanometer-sized domains of a low refractive index material, arranged between said first electrode layer and said one or more organic light-active layers. The discontinuous layer of discrete, randomly distributed nano-sized domains increases the light extraction efficiency of the OLED.

## Claims

### Claim 1

An organic light-emitting device (OLED) comprising:
a transparent substrate;
a first, transparent electrode layer arranged on said substrate;
one or more organic light-active layers arranged on said first electrode layer;
a second electrode layer arranged on said one or more organic light-active layers; and
a discontinuous layer comprising discrete, nanometer-sized domains of a low refractive index material, arranged randomly distributed, in a plane of the OLED between said first electrode layer and said one or more organic light-active layers.

### Claim 2 (depends on 1)

The OLED according to claim 1, wherein said low refractive index material has a refractive index lower than 1.8.

### Claim 3 (depends on 1)

The OLED according to claim 1, wherein said low refractive index material has a refractive index in the range of 1.0 to 1.4.

### Claim 4 (depends on 1)

The OLED according to claim 1, wherein said discrete, randomly distributed domains have an average width in the range of 1 to 500 nm, for example about 100 nm.

### Claim 5 (depends on 1)

The OED according to claim 1, wherein the average distance between two adjacent domains is 1 μm or less.

### Claim 6 (depends on 1)

The OLED according to claim 1, wherein said discrete, randomly distributed domains are pillar-like structures.

### Claim 7 (depends on 1)

The OLED according to claim 1, wherein said discontinuous layer comprising the nano-sized domains of the low refractive index material increases the extraction of light from the electrode layer and/or the organic layer into said substrate.

### Claim 8 (depends on 1)

The OLED according to claim 1, further comprising a light outcoupling structure provided on said substrate layer.

### Claim 9 (depends on 1)

The OLED according to claim 1, wherein said first electrode layer is a transparent anode layer.

### Claim 10 (depends on 1)

The OLED according to claim 1, wherein said first electrode layer is a transparent cathode layer.

### Claim 11 (depends on 1)

The OLED according to claim 1, wherein said second electrode is transparent.

### Claim 12 (depends on 1)

A luminaire comprising an OLED according to claim 1.

### Claim 13 (depends on 1)

A display device comprising an OLED according to claim 1.

### Claim 14

A method of manufacturing an organic light-emitting diode, comprising the steps of:
providing a transparent substrate;
depositing a first transparent electrode layer over said substrate;
depositing discrete domains of a low refractive index material in a random pattern, in a plane of the organic light-emitting diode, to form a discontinuous layer on said first electrode layer;
depositing one or more organic light-active layers on said discontinuous layer; and
depositing a second electrode layer on said one or more organic light-active layers.

### Claim 15 (depends on 14)

The method according to claim 14, wherein said step of depositing discrete domains of a low refractive index material to form a discontinuous layer is performed by
forming a continuous layer of said low index material
imprinting a pattern into said layer of low index material; and
removing excess low index material to form a discontinuous layer comprising discrete domains.

### Claim 16 (depends on 1)

The OLED according to claim 1, wherein the number of domains per μm2 is in the range of 1 to 100.

### Claim 17 (depends on 14)

The method according to claim 14, wherein said low refractive index material having dimensions smaller than 1 μm and having a refractive index lower than 1.8, wherein the average distance between two adjacent domains is 1 μm or less.

### Claim 18 (depends on 14)

The method according to claim 14, wherein the number of domains per μm2 is in the range of 1 to 100.