Luminogènes-AIE à base de ligands hydroxyamidines : synthèse, caractérisation et application comme pigments pour dispositifs
OLEDs (organic light-emitting diode) are able to transduce electrical energy efficiently into light and because of their flexibility, lightness and high-quality colors, they can also be used in flat-screen display applications. However, the commercialization of this technology is slowed-down by the high cost of the materials and the complex methods that are used for the device fabrication. The purpose of this research is to find low-cost affordable dyes for OLEDs with good energy efficiency characteristics that can be integrated in the device by less complex fabrication methods. In this project, we developed a new series of N,O bidentate benzamidine N-oxide ligands for aggregation-induced emission characteristics (AIE) through complexation. AIE is the non-emissive molecules in solution that luminesce in the solid state. AIE luminigens are a new category of dyes for solid state emission in optoelectronic devices. AIE characteristics can be triggered by the coordination of cationic center, which rigidify the O-N-C=N backbone of the ligand. Coordination chemistry allows the use of ligands and metallic centers as element-blocks for the construction of AIE complexes that have interesting structural and photophysical properties. In addition to this, the tunability of electronic properties and sterics of the complexes with AMOX ligands can be easily obtained by modifying the ligand with the addition of substituents. This would allow to vary the emission color of the dyes. Finally, by using cationic centers from less toxic earth-abundant elements, the production-cost and the environmental impact of this technology can be reduced, thus, opening a door to the commercialization of a sustainable and cost-effective lighting technology.
Zinc Aluminium Bore Ligands Hydroxyamidine AIE AIEE OLED WOLED Coordination chemistry Boron N,O ligands Amidine N-oxide Substituents Isomerism Electrostatic interactions Solid state emission Morphology Aggregation-induced emission Mechanochromism Vapochromism Thermochromism