Organic Light-Emitting Diodes

By: Carl

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Roll No: 03

What is an OLED?

An OLED is an electronic device made by placing a series of organic thin films between two conductors. When electrical current is applied, a bright light is emitted.

A device that is 100 to 500 nanometers thick or about 200 times thinner than a human hair.

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The OLED Structure3

Manufacturing

1. Vacuum deposition or Vacuum thermal evaporation (VTE)

gently heated in a vacuum chamber

2. Organic vapor phase deposition (OVPD) low pressure chamber carrier gas is used

3. Inkjet Printing polymers are sprayed onto substrates

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How OLEDs Emit Light

The battery or power supply of the device containing the OLED applies a voltage across the OLED.

An electrical current flows from the cathode to the anode through the organic layers. (an electrical current is a flow of electrons)

At the boundary between the emissive and the conductive layers, electrons find holes.

The OLED emits light.

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Types of OLEDs

Passive-matrix

Active-matrix

Transparent

Top-emitting

Flexible

White

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Passive-Matrix7

• Anode and cathode strips are perpendicularly arranged

Active-Matrix8

• Full layer anode and cathode, anode overlays TFT

Transparent9

Top-Emitting10

Flexible11

White12

Advantages

Thinner, lighter and more flexible

Brighter

Consume much less power

Easier to produce and make into larger sizes

Large field of view

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Disadvantages

Lifetime

Manufacturing

Water

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Current OLEDs15

Future of OLEDs?16

Reference

www.howstuffworks.comwww.wikipedia.orgwww.nytimes.comwww.laserfocusworld.comwww.jyi.orgwww.inhabitat.comwww.oled-info.comwww.proavmagazine.com

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THANK YOU!

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