Organic Light-Emitting Diodes

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Organic Light-Emitting Diodes
By Grant Warfield
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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 smaller than a human hair.

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The OLED Structure
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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 electron 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-Matrix
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Active-Matrix
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Transparent
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Top-Emitting
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Flexible
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White
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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 OLEDs
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Future of OLEDs?