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Exciton Relaxation in PDA-4BCMU: From Crystals to Films

Nowak, M. J. / Blanchard, G. J. / Baker, G. L. / Etemad, S. / Soos, Z. G.

Abstract We have investigated the role of disorder on the optical response of polydiacetylene 4BCMU using linear and time resolved absorption spectroscopy. In the highly ordered crystalline form, a sharp excitonic absorption is observed. On heating the crystals above the hydrogen-bond melting temperature (120 °C), the excitonic absorption blue-shifts and broadens. Further blue shifting and broadening is observed in the highly disordered spin-cast films. Time resolved absorption measurements show a fast (~10 ps) bleaching signal that is insensitive to the degree of disorder. However, in contrast to PDA-PTS crystals, a long-lived (~ 400 ps) photoresponse is observed only in the disordered samples.

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Exciton Relaxation in PDA-4BCMU: From Crystals to Films

Nowak, M. J. / Blanchard, G. J. / Baker, G. L. / Etemad, S. / Soos, Z. G.

Abstract We have investigated the role of disorder on the optical response of polydiacetylene 4BCMU using linear and time resolved absorption spectroscopy. In the highly ordered crystalline form, a sharp excitonic absorption is observed. On heating the crystals above the hydrogen-bond melting temperature (120 °C), the excitonic absorption blue-shifts and broadens. Further blue shifting and broadening is observed in the highly disordered spin-cast films. Time resolved absorption measurements show a fast (~10 ps) bleaching signal that is insensitive to the degree of disorder. However, in contrast to PDA-PTS crystals, a long-lived (~ 400 ps) photoresponse is observed only in the disordered samples.

Exciton Relaxation in PDA-4BCMU: From Crystals to Films

Nowak, M. J. / Blanchard, G. J. / Baker, G. L. / Etemad, S. / Soos, Z. G.

Abstract We have investigated the role of disorder on the optical response of polydiacetylene 4BCMU using linear and time resolved absorption spectroscopy. In the highly ordered crystalline form, a sharp excitonic absorption is observed. On heating the crystals above the hydrogen-bond melting temperature (120 °C), the excitonic absorption blue-shifts and broadens. Further blue shifting and broadening is observed in the highly disordered spin-cast films. Time resolved absorption measurements show a fast (~10 ps) bleaching signal that is insensitive to the degree of disorder. However, in contrast to PDA-PTS crystals, a long-lived (~ 400 ps) photoresponse is observed only in the disordered samples.

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Titel:

Exciton Relaxation in PDA-4BCMU: From Crystals to Films

Beteiligte:

Nowak, M. J. (Autor:in) / Blanchard, G. J. (Autor:in) / Baker, G. L. (Autor:in) / Etemad, S. (Autor:in) / Soos, Z. G. (Autor:in)

Erschienen in:

Conjugated Polymeric Materials: Opportunities in Electronics, Optoelectronics, and Molecular Electronics ; 421-427

NATO ASI Series ; 182

Erscheinungsdatum:

01.01.1990

Format / Umfang:

7 pages

ISBN:

978-94-010-7416-2 , 978-94-009-2041-5

ISSN:

DOI:

https://doi.org/10.1007/978-94-009-2041-5_32

Medientyp:

Aufsatz/Kapitel (Buch)

Format:

Elektronische Ressource

Sprache:

Englisch

Schlagwörter:

Cast Film , Exciton Absorption , Random Spatial Arrangement , Exciton Lifetime , Bleaching Signal Chemistry , Industrial Chemistry/Chemical Engineering , Characterization and Evaluation of Materials , Organic Chemistry , Optics, Lasers, Photonics, Optical Devices

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