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My academic seminar for B.tech
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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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