Titre :Tuning Chromaticity by Second-Sphere Coordination of Iridium(III) Complexes
Endroit: Pavillon Roger-Gaudry, Salle G-715
Hôte : Prof. Andreea Schmitzer et Prof.Garry Hanan
Résumé : Iridium complexes (with various N^C ligands) are undergoing intensive investigation, due to their excellent performance when used as emitters in phosphorescent organic light emitting diodes (PhOLEDs). To fulfil the requirements of full-colour OLED displays, the colour regulation (towards blue, green and red emissions) is highly desirable.1 In this study, we are exploring the colour tuning of different iridium emitters by host- guest assembly with DNA base-pair-like interactions in super strong hydrogen bonded arrays.2 The ideal interactions for holding supramolecular systems together are hydrogen bonds, as they combine relatively strong intermolecular attractions with excellent reversibility. Our findings suggest that this methodology for colour tuning can negate the synthetic manipulation of the ligand structure around iridium,3 which is often costly and time consuming. We are analysing the chromaticity of iridium complexes by simply varying the concentration of compliment-guest (Figure 1),4 while examining the strength of binding and change in the emission properties. This approach focuses on supramolecular chemistry combined with synthesis, which can lead to novel materials with dynamic properties.