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Volumn 288, Issue 5466, 2000, Pages 652-656

Control of energy transfer in oriented conjugated polymer-mesoporous silica composites

Author keywords

[No Author keywords available]

Indexed keywords

SILICON DIOXIDE;

EID: 0034725084     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.288.5466.652     Document Type: Article
Times cited : (672)

References (42)
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    • note
    • Many groups have observed differing excited state absorption dynamics in solutions versus films of PPV-based polymers; see, e.g. (29) or (30). However, the origin of this difference is controversial and may depend on photooxidation of the sample or the intensity of the excitation beam in addition to interchain effects; see, e.g. (30-32). No matter how the effect arises, under the conditions of our experiments, the decay of MEH-PPV's excited state absorption is different in solution and film environments (Fig. 2). Thus, we can use excited state absorption to help determine the local environment of the polymer in different regions of the composite sample.
  • 33
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    • note
    • The polarization notation used throughout this report is as follows: the first character indicates the pore direction in the lab frame (always vertical in this report), the second character indicates the lab polarization of the excitation beam, and the third character denotes the collection or probe polarization direction. For example, VHV indicates excitation light polarized perpendicular to the pore direction but collection or probe light polarized along the pore channels.
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    • note
    • The single exponential fit is not representative of a particular model for intrachain energy transport; rather, it is merely a way to define a characteristic time for the anisotropy increase. Because the anisotropy at long times is computed from the ratio of two small numbers (Eq. 1 at times after most of the excitons have decayed), we do not feel that the signal-to-noise ratio of the anisotropy increase justifies fitting to a more complex model with a higher number of parameters.
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    • note
    • Supported by the Petroleum Research Fund, administered by the ACS (grants 32773-G6 and 33715-G5); the Office of Naval Research (grant N00014-99-1-0568); the NSF (grant DMR-9971842). B.J.S. is a Cottrell Scholar of Research Corporation and an Alfred P. Sloan Foundation Research Fellow. We thank F. Wudl and R. Helgeson for providing the MEH-PPV used in this work.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.