Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 76: Poster IIIC
HL 76.12: Poster
Thursday, March 19, 2020, 15:00–17:30, P2/4OG
Photoluminescence studies of organic microcrystals with π-conjugated core/shell molecule — Aswin Asaithambi1, Kohei Iwai2, •Guenther Prinz1, Hiroshi Yamagishi2, Yohei Yamamoto2, and Axel Lorke1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany — 2Division of Material Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
Organic crystals in optoelectronic devices such as LEDs or solar cells have drawn a lot of attention in the last years. Oligo(p-phenylene vinylene) (OPV) molecules have many interesting properties such as a well-defined architecture and the ability to be modified with functionalized endgroups opening up an exciting number of functional assemblies. π-conjugated core/shell molecules can be grown into crystalline solids.
Here, we report on photoluminescence studies of eye-shaped crystals synthesized from fluorescent π-conjugated core/shell molecules. These crystals emit light in the green spectral range under 405 nm excitation. The spatial profile of the emission is not completely symmetric and depends on the excitation spot within the crystal. This already indicates a special orientation of the molecules within the crystal. XRD data also shows distinct diffraction peaks for these crystals, showing that the molecules are well ordered. Polarization dependent absorption and emission studies show an angle dependent characteristic of the light emission of these crystals, which will be discussed regarding the crystal and molecular orientation.