Review on Organometallic Dyes for Light-Emitting Diodes

In new technology fields, organic light emitting diodes (OLED) and the optimization of its components are of great interest. Organometallic complexes contain heavy metals, leading to the mixing of single and triple manifolds and increasing emission efficiency. For OLEDs to be useful in display applications, true red, green, and blue emissions of sufficient luminous efficiencies and proper chromaticity are required. The transition metals used to prepare emitting organometallic complexes are iridium, platinum, osmium and zinc (II). The development of these compounds depends on substitutions and organic structural units that are used as ligands. The results show that platinum and iridium have the best performance in preparing luminous organometallic complexes. In this article, a review of the recent progress in the development of organometallic compounds used in organic light-emitting diodes is highlighted. The preparation of optimal structure to achieve color purity and the development of the application of organometallic compounds will also be investigated.