Abstract
Some simple aromatic molecules have interesting electro-optical properties and potential for use in organic opto-electronic devices. The structure of thin films of the electroluminescent molecule POPOP (1,4-bis(5-phenyloxazol-2-yl)benzene) grown in vacuum on KCl(0 0 1) substrates was studied with grazing-incidence X-ray diffraction. POPOP films consist of monoclinic bulk-like crystallites with (1 0 2) POPOP∥(0 0 1) KCl which show a strong preferential orientation with [0 1 0] POPOP∥[1 1 0] KCl. The microstructure of the films is characterized by needle-shaped crystallites forming 90°, 180°, and some 45° domain walls. The morphology of the films is determined by an internal (1 0 2) molecular packing plane in the bulk POPOP structure and the corrugation of the substrate.
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