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Coumarin-based emissive liquid crystals

 
: Buchs, J.; Gäbler, M.; Janietz, D.; Sawade, H.

:

Liquid crystals 41 (2014), Nr.11, S.1605-1618
ISSN: 0267-8292
ISSN: 1366-5855
Englisch
Zeitschriftenaufsatz
Fraunhofer IAP ()

Abstract
Calamitic luminophores are presented based on an elongated aryl-substituted coumarin core. The substitution pattern at terminal and lateral positions were systematically modified. The new compounds exhibit smectic C and/or nematic liquid crystalline phases. The chromophores show fluorescence in the blue spectral region. The benzopyranones are miscible with acrylate-substituted reactive nematic mesogens. Uniaxial orientation of the mixed systems was achieved by surface-assisted alignment on polyimide orientation layers. The film anisotropy was stabilised by subsequent photocrosslinking. The crosslinked oriented films display linear polarised photoluminescence upon isotropic excitation.

: http://publica.fraunhofer.de/dokumente/N-301929.html