Show simple item record

Exciton patterns in molecular dots and wires and application to polymer morphology

dc.contributor.authorKopelman, Raoulen_US
dc.contributor.authorShi, Zhong-Youen_US
dc.contributor.authorLi, Ching Shanen_US
dc.date.accessioned2006-04-10T14:52:30Z
dc.date.available2006-04-10T14:52:30Z
dc.date.issued1991en_US
dc.identifier.citationKopelman, Raoul, Shi, Zhong-You, Li, Ching Shan (1991)."Exciton patterns in molecular dots and wires and application to polymer morphology." Journal of Luminescence 48-49(Part 1): 143-146. <http://hdl.handle.net/2027.42/29559>en_US
dc.identifier.urihttp://www.sciencedirect.com/science/article/B6TJH-46D2F94-69/2/c8ffb82ca919b3520671780280c02cf5en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/29559
dc.description.abstractTime sequencing of laser excitation can control the microscopic patterns of molecular excitations (excitons) in nanometer scale molecular ensembles. This is demonstrated for isolated guest chains in polymer blends (P1VN/PMMA) and for molecular clusters in molecularly doped polymers (naphthalene/PMMA). The subwavelength exciton patterns are monitored via time resolved luminescence and fusion kinetics. The heterogeneity exponent (h) is 0.5 for isolated P1VN chains, zero (classical) for pure P1VN and "fractal-like" throughout certain concentration regimes. Correlation is made with morphology changes (phase separation, filamentation). At concentrations below 0.01%, the excitons are constrained to a truly one-dimensional topology (wire). At higher concentrations there is a fractal-like topology which may be associated with spinoidal decomposition. Similar studies were conducted on naphthalene-doped PMMA (1-20 wt%). The lower concentration samples are neither segregated nor random solution phases. They probably consist of islands (dots) of naphthalene aggregates. The exciton distribution in such islands is non-Poissonian under steady-state excitation or under pulse excitation with delay times, resulting in anomalous exciton fusion kinetics.en_US
dc.format.extent298844 bytes
dc.format.extent3118 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherElsevieren_US
dc.titleExciton patterns in molecular dots and wires and application to polymer morphologyen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbsecondlevelNuclear Engineering and Radiological Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.subject.hlbtoplevelEngineeringen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Chemistry, University of Michigan, Ann Arbor, MI 48109, USAen_US
dc.contributor.affiliationumDepartment of Chemistry, University of Michigan, Ann Arbor, MI 48109, USAen_US
dc.contributor.affiliationumDepartment of Chemistry, University of Michigan, Ann Arbor, MI 48109, USAen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/29559/1/0000647.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1016/0022-2313(91)90093-Ben_US
dc.identifier.sourceJournal of Luminescenceen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


Files in this item

Show simple item record

Remediation of Harmful Language

The University of Michigan Library aims to describe library materials in a way that respects the people and communities who create, use, and are represented in our collections. Report harmful or offensive language in catalog records, finding aids, or elsewhere in our collections anonymously through our metadata feedback form. More information at Remediation of Harmful Language.

Accessibility

If you are unable to use this file in its current format, please select the Contact Us link and we can modify it to make it more accessible to you.