Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session III
CPP 37.27: Poster
Mittwoch, 3. April 2019, 11:00–13:00, Poster B1
Derivates of Imidazo[1,5-a]pyridine as Blue Light-Emitters for OLED — •Georg Albrecht1, Carina Rössiger2, Jasmin Martha Herr2, Harald Locke2, Hisao Yanagi3, Richard Göttlich2, and Derck Schlettwein1 — 1Justus-Liebig-Universität Gießen, Institut für Angewandte Physik — 2Justus-Liebig-Universität Gießen, Institut für Organische Chemie — 3Nara Institute of Science and Technology
1,3-disubstituted imidazo[1,5-a]pyridines are discussed for applications in material science as new and oxidation-stable blue emitters, e.g. for organic light emitting diodes (OLED). We investigated the stepwise change of physical properties in solution and solids when introducing nitrogen atoms and/or increasing sizes of aromatic rings as substitutional moieties. As an extension, a larger homologue, i. e., imidazo[1,5-a]quinoline was also studied. Absorption and emission spectra as well as quantum yields were measured and interpreted based on DFT calculations. Single crystals were grown from solution or by entrainer sublimation and thin films were prepared by physical vapor deposition. Fluorescence microscopy was used to investigate on crystal emission. Comparing the results obtained at thin films and in solution, the molecular coupling in the different phases is assessed and their applicability in OLED devices is discussed.