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Highly Fluorescent Crystalline and Liquid Crystalline Columnar Phases of Pyrene-Based Structures

Title data

Hayer, Anna ; de Halleux, Véronique ; Köhler, Anna ; El-Garoughy, Abdel ; Meijer, Egbert W. ; Barberá, Joaquin ; Tant, Julien ; Levin, Jeremy ; Lehmann, Matthias ; Gierschner, Johannes ; Cornil, Jérôme ; Geerts, Yves Henri:
Highly Fluorescent Crystalline and Liquid Crystalline Columnar Phases of Pyrene-Based Structures.
In: The Journal of Physical Chemistry B. Vol. 110 (2006) Issue 15 . - pp. 7653-7659.
ISSN 1520-5207
DOI: https://doi.org/10.1021/jp0573689

Official URL: Volltext

Abstract in another language

A concept for highly ordered solid-state structures with bright fluorescence is proposed:  liquid crystals based on tetraethynylpyrene chromophores, where the rigid core is functionalized with flexible, promesogenic alkoxy chains. The synthesis of this novel material is presented. The thermotropic properties are studied by means of differential scanning calorimetry (DSC), cross-polarized optical microscopy (POM), and X-ray diffraction. The mesogen possesses an enantiotropic Colh phase over a large temperature range before clearing. The material is highly fluorescent in solution and, most remarkably, in the condensed state, with a broad, strongly red shifted emission. Fluorescence quantum yields (ΦF) have been determined to be 70% in dichloromethane solution and 62% in the solid state. Concentration- and temperature-dependent absorption and emission studies as well as quantum-chemical calculations on isolated molecules and dimers are used to clarify the type of intermolecular interactions present as well as their influence on the fluorescence quantum yield and spectral properties of the material. The high luminescence efficiency in the solid state is ascribed to rotated chromophores, leading to an optically allowed lowest optical transition.

Further data

Item Type: Article in a journal
Refereed: No
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 10 Mar 2015 12:44
Last Modified: 12 Apr 2018 11:23
URI: https://eref.uni-bayreuth.de/id/eprint/7979