Organic Light Emitting Diodes

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Organic Light Emitting DiodesOrganic Light-Emitting Diode technology, also abbreviated OLED, is relatively new but very promising, especially what concerns design of data display devices. OLEDs' main difference from other LEDs is that they are made of organic compounds which emit light in response to an electric current. This feature determines their main properties.OLEDs are made of special thin-film multilayer structures. These layers are special polymers. There is anode and cathode. Electrons can flow between them. When positive voltage is applied to the anode then electrons from the cathode start moving towards it. That means that the cathode emits them into the emissive layer while the anode gets them from a conductive layer. As the result of the flow of charged particles the layers acquire different charges. The emissive layer is charged negatively while holes appear in the conductive layer which charges positively. Under the influence of static electricity electrons and holes meet, and recombination occurs. A peculiar feature of organic matter is that the holes have greater mobility as compared with electrons. Thus recombination occurs closer to the emissive layer. Electrons' energy is decreasing which is accompanied by the emission of electromagnetic radiation into space in the form of a visible light.To improve the technology several of its aspects may be researched further. This can be the chemical composition of layers, enriching additive agents, and new ...

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