Excimer luminescence from single crystals and films of a cyano-substituted phenylene-vinylene model compound
| Autor: | Hendrik-Jan Brouwer, Viktor Krasnikov, P.F.van Hutten, Georges Hadziioannou |
|---|---|
| Jazyk: | Dutch; Flemish |
| Rok vydání: | 1999 |
| Předmět: |
Photoluminescence
INTERCHAIN PHOTOLUMINESCENCE Chemistry DERIVATIVES LEDS Stacking LIGHT-EMITTING-DIODES General Physics and Astronomy single-crystal structure Context (language use) excimer Crystal structure Ring (chemistry) Photochemistry poly(para-phenylene vinylene) Crystallography Phenylene POLY(PHENYLENE VINYLENE) photoluminescence Physical and Theoretical Chemistry oligomers Luminescence Single crystal CONJUGATED POLYMERS |
| Zdroj: | Chemical Physics, 241(1), 139-154. ELSEVIER SCIENCE BV |
| ISSN: | 0301-0104 |
| DOI: | 10.1016/s0301-0104(98)00413-3 |
| Popis: | In the context of luminescence from the solid state of poly( para -phenylene vinylene)-type materials, we report a study of three octyloxy-substituted five-ring oligo( para -phenylene vinylene)s, two of which bear cyano substituents on the innermost vinylene bonds. For each compound, the molecular arrangement in the single crystal has been derived from a crystallographic analysis. For the compound which has the cyano group not directly adjacent to the central ring, synthesis and structure are described here in detail. This compound, in contrast to the other two, has molecular π -stacking in the crystal lattice. Only for this compound do we observe a strongly red-shifted, long-lived emission, which is therefore ascribed to an excimer-type intermolecular excitation. The observations of excimer-type emission from cyano-substituted alkoxy–PPV's and in related copolymers fit in very well with the molecular picture derived from this study of model compounds. |
| Databáze: | OpenAIRE |
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