Exciton patterns in molecular dots and wires and application to polymer morphology
dc.contributor.author | Kopelman, Raoul | en_US |
dc.contributor.author | Shi, Zhong-You | en_US |
dc.contributor.author | Li, Ching Shan | en_US |
dc.date.accessioned | 2006-04-10T14:52:30Z | |
dc.date.available | 2006-04-10T14:52:30Z | |
dc.date.issued | 1991 | en_US |
dc.identifier.citation | Kopelman, 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.uri | http://www.sciencedirect.com/science/article/B6TJH-46D2F94-69/2/c8ffb82ca919b3520671780280c02cf5 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/29559 | |
dc.description.abstract | Time 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.extent | 298844 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Elsevier | en_US |
dc.title | Exciton patterns in molecular dots and wires and application to polymer morphology | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Physics | en_US |
dc.subject.hlbsecondlevel | Nuclear Engineering and Radiological Sciences | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA | en_US |
dc.contributor.affiliationum | Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA | en_US |
dc.contributor.affiliationum | Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/29559/1/0000647.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/0022-2313(91)90093-B | en_US |
dc.identifier.source | Journal of Luminescence | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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