Luminescence is meaning the emission of visible, ultraviolet or infrared light photons by an electronically-excited species. Polymer light displayed electrical and semiconducting properties. The operations of Organic LEDs (OLED) and inorganic LEDs are very simple and easy. Polymers could be effective as Light Emitting Diodes (LEDs). The efficiency and lifetime of OLEDs develop due to evolved of device, organic materials and structure. Many polymers can be synthesized from monomers which contain two functional groups. There are many routes for synthesize organic monomers to form LEDs. Different light colors could be emitted with high efficiency and it dependent on the band gap of π-π* transition in the polymer. One of the best examples of a conducting polymer is the Polyacetylene (PA). In this polymer, the localized “sigma” bond can form a strong chemical bond and each double bond in the polymer consists of a weak localized π bond which offers a route for the mobility of the charge along the polymeric chain backbone. The range of lifespan of OLED light is between 10,000-50,000 hours. This range depends on many factors like conditions in which it’s used and how extensively it’s used. If it is used 12 hours a day, its lifespan could last up to 10 years.

This special issue aims to form the basis for the development of commercial EL flat panel displays, and the operating life of these devices should be extended. The most important aim is to avoid and solve any problem that can lead to hardware failure.