Organic Light-Emitting Diodes

By:Shashi Kant Jangid

Previews: What is an OLED History of OLEDs Architecture of OLEDs Organic compound use in OLEDs Working Principle Types of OLEDs Advantages and Disadvantages Current and Future uses of OLEDs Conclusion

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.

http://en.wikipedia.org/wiki/Oled/1

History Of OLEDs

http://www.universaldisplay.com/index.html

Structure of OLEDs

Substrate: supports the OLED (Glass,Clear Plastic ,Foil). Anode (Transparent) : Removes electrons and adds ‘Holes’. Organic layer : (a) Conducting Layer : transport ‘Holes’ from the anode (One conducting polymer is Polyaniline) (b) Emissive Layer : transport electrons from cathode (This is where the light is made , One emissive polymer is Polyfluorene) Cathode : Injects the electron when current flows through the device

An OLED is a solid-state semiconductor device that is 100 to 500 nm thick or about 200 times smaller than a human hair.An OLED consists of the following parts :

Organic Compound use in OLEDs

Working Principle(How does OLED 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.

Types of OLEDs

Passive-Matrix Active-Matrix

Transparent Flexible

Advantages And Disadvantages

Lifespan

Manufacturing

Color Balance

Water Damage

Thinner , lighter, Brighter and more flexible

Brighter

Eco- Friendly

Consume much less power

Easier to produce and make into larger size

Large field of view

Current and Future uses of OLED

OLED TV

Mobile phones with OLED screens

Rolltop Laptop

Conclusion

Organic Light Emitting Diodes are evolving as the next generation displays.

It’s green Technology , good for environment but expensive so need to research on This.

As OLED display technology matures, it will be better able to improve upon certain existing limitations of LCD including

high power consumption limited viewing angles poor contrast ratios

Sources http://ezinearticles.com/?OLED-Lighting-and-LED-Lighting:--The-

Difference-between-LED-and-OLED&id=460933

http://en.wikipedia.org/wiki/Oled

http://www.universaldisplay.com/index.html

http://www.oled-info.com/oledTV

http://www.youtube.com/watch?v=3Ufs9Wx0VXQ