Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 36: Organic Thin Films, Organic-Inorganic Interfaces: Session II (joint session DS/CPP)
DS 36.6: Vortrag
Freitag, 16. März 2018, 10:45–11:00, H 0111
Structure-Dependent Emission of 1-(Pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline — •Georg Albrecht1,3, Jasmin Martha Herr2,3, Hisao Yanagi3, Richard Göttlich2, and Derck Schlettwein1 — 1Institute of Applied Physics, JLU Giessen, Germany — 2Institute of Organic Chemistry, JLU Giessen, Germany — 3Nara Institute of Science and Technology, Japan
1,3-disubstituted imidazo[1,5-a]pyridines are receiving increased interest for applications in material science, mainly regarding organic light emitting diodes (OLED). In this work we studied the related 1-(pyridin-2-yl)-3-(quinolin-2-yl)imidazo[1,5-a]quinoline (PCIC) as a new and oxidation-stable blue emitter. Thin films were prepared by physical vapor deposition onto quartz glass, single crystals were grown from solutions or by entrainer sublimation. Thin films and crystals were characterized by AFM, XRD, optical absorbance and mainly by steady-state and time-resolved emission and compared to results obtained in solution. Storage of the originally amorphous thin film samples revealed an interesting crystallization behaviour, which could be resolved by fluorescence microscopy and comparison to the results obtained at single-crystals. A clear trend of red-shifted emission was observed for different crystalline phases relative to amorphous samples, corresponding to the change in molecular arrangement.