New version Mobile phone, Laptop, TV etc uses OLED screen to give brighter screen display. The advantage of the display is that, the screen can be viewed from any angle without glare and the image will be more clear and sharp. OLED (Organic LED) is a 100 – 500 nanometers thick semiconductor film that emits light through Electrophosphorescence. OLED is also called as OELD (Organic Electro Luminescent Device) and made up of thin layers of organic materials that emit Red, Green, Blue and white light. The OLED screen is much thinner than the LCD screen.
The Organic material in the OLED consists of Amorphous and Crystalline molecules without a definite arrangement. These molecules are arranged in different layers. When a potential difference is applied between the anode and cathode of OLED, current flows through the organic layer of OLED. During the flow of current, cathode layer emits electrons to the emissive layer. Anode then gives electrons from the conductive layer creating holes. These electrons combine with the holes in junction between the emissive and conductive layers. When the electrons combine with holes, the energy of electrons is emitted as photons. Colour of the photons depends on the type of the organic material in the emissive layer.Polymer light-emitting diodes (PLED), also Light-Emitting Polymers (LEP), are used in electroluminescent conductive polymer. Typical polymers used in PLED displays include derivatives of Poly(p-phenylene vinylene) and Polyfluorene.