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                                         OLED (Organic Light Emitting Diode)

An organic light emitting diode is a light emitting diode in which the emissive electroluminescent layer is a film of organic compound which emits light in response to an electric current. This layer of organic semiconductor is situated between two electrodes, at least one of these electrodes is transparent.
The emissive layer used  used in a OLED is made up of organic plastic molecules out of which the most commonly used is polyfluorene.The conducting layer is also an organic molecule and the most commonly used component is polyaniline.

To Make  An OLED:-

1. To make an OLED light up ,we simply attack a voltage across the anode and cathode.
2. As the electricity starts to flow ,the cathode receives electrons from the power source and the anode loses them.
3. Now we have a situation where the added electrons are making the emissive layer negatively charged ,while the conducting layer is becoming positively charged.
4. Positive holes are more mobile than negative electrons so they jump across the boundary from the conducting layer to the emissive layer.when a hole meets an electron ,the two things cancel out and release a brief burst of energy in the form of a quantum of light or a proton ,in other  words. This process is called recombination, and because it's happening many times a second the OLED produces continuous light for as long as the current keeps flowing.          

Advantages Of OLED:-

• The manufacture of OLED is highly economical and is more efficient than LCD and the panel screens.
• It will be a great surprise to see displays on our clothing and fabrics.This technology  will help in carrying huge displays in our hands.
• There is much difference in watching a HD TV to an OLED display.As the contrast ratio of OLED is very high,it can be watched from an angle about 90 degrees without any difficulty.
• No back light is produced by this device and the power consumption is also very less.
• OLED has a refresh rate of 100,000 Hz which is almost 9900 HZ greater than an LCD display.
• The response time is less than 0.01 ms.LCD needs response time of 1 ms.