ORGANIC LIGHT EMITTING DIODES (OLED)

Abstract

"Organic Light Emitting Diodes (OLED) now reach the third phase concerning efficiency. The first devices are based on pure organic materials, and the second and third generations are based on combinations between metals and organic ligands in so- called organometallics for which their emission external quantum efficiency is increased. The second generation is now widely used in large displays reaching high efficiency because of the spin-orbit coupling between metal and their ligands, which induces intersystem crossing processes. The third generation of OLED comprises an increased external quantum efficiency obtained by adequately choosing the ligands, reaching a theoretical value of 100%. These OLEDs will be briefly described with their advantages and the technologies necessary for next-generation displays."