Summary of the technology
The use of ionic dyes leads to materials that do not suffer from compatibility issues and allows for a much more economic production of LECs. These dyes are known for many years and used in applications such as photographic films and recordable DVD discs, and are produced in large quantities at low cost. Some examples of suitable ionic organic dyes are cyanine, hemicyanine and squarilene dyes.
Description of the tech for sale
Generally, organic light-emitting diodes (OLEDs) have considerable advantages compared to other solid-state lighting technologies. Today, best OLEDs use a multi-layer architecture that is very sensitive to ambient atmosphere. Light-emitting electrochemical cells (LECs) are much simpler, can be solution processed and are less sensitive to the ambient atmosphere. The main problem of these devices is that they use transition metal complexes, these are very rare metals and as a consequence very expensive. Researchers from Universitat de València have developed a new type of LEC that use ionic organic dyes as the electroluminescent material.
Researchers have found that these small ionic molecules are able to perform all necessary actions in LEC’s electroluminescent materials: transport of electrons, transport of holes and emission of photons. Therefore, it is not necessary to combine the dye with other charge transport material, simplifying and reducing the cost of the device.
Main advantages of its use
- The new types of LECs have the following advantages: Low cost: manufacture with commercial and readily available materials Performance: satisfactory radiance, efficiency and lifetime levels of the device, suitable for future technological applications. Solution processable from benign solvents.
- LECs are interesting candidates for use in thin-film lighting applications, as they operate at very low voltages (yielding high power efficient devices) and are easy to produce.