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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and properties of an n-self-doped conducting polymer (1993)
    s.l. : American Chemical Society
    Chemistry of materials 5 (1993), S. 1598-1599 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00035a003
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  • 2
    Electronic Resource
    Electronic Resource
    Photoinduced electron transfer processes in oligothiophene/C60 composite films (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 2628-2635 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present near steady-state photoinduced absorption (PIA) spectroscopy and steady-state light-induced electron spin resonance (LESR) studies on photoinduced electron transfer reactions in composite films of well defined α-oligothiophenes (Tn, n=6, 7, 9, and 11) as electron donor with buckminsterfullerene (C60) and a methanofullerene derivative (1-(3-cholestanoxycarbonyl)- propyl-1-phenyl-[6.6]C61) as electron acceptors. Dispersion on a molecular level of these fullerenes in oligothiophene films causes quenching of both the photoluminescence and intersystem crossing after photoexcitation across the π–π* energy gap as a result of a fast electron transfer reaction. The PIA spectra exhibit bands due to T+•n radical cations, fullerene radical anions and electroabsorption oscillations of the π–π* band edge resulting from strong local electric fields set up by the photoinduced charges. LESR spectra give additional unambiguous evidence of the photoinduced electron transfer reaction. Using PIA and LESR, we do not observe an effect of the conjugation length of the photoinduced electron transfer reaction or on the metastability of the charge-separated state. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468694
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  • 3
    Electronic Resource
    Electronic Resource
    Semiconducting polymer diodes: Large size, low cost photodetectors with excellent visible-ultraviolet sensitivity (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3422-3424 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photodiodes fabricated from conjugated polymers exhibit excellent sensitivity to visible-UV radiation. The photosensitivity increases with reverse bias voltage. The photoresponse of diodes fabricated from poly(3-octyl thiophene) is relatively flat in the visible and near UV; for wavelengths shorter than 550 nm, the absolute sensitivity is greater than 0.3 A/W under reverse bias of 15 V, larger than that of commercial UV-enhanced Si photodiodes. Photodiodes made from poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene], MEH-PPV, sensitized with C60, show similar sensitivity. The ease of fabrication into large size, arbitrary shapes, and even onto flexible substrates makes the polymer photodiode a novel photodetector with potential for use in a wide range of applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111260
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  • 4
    Electronic Resource
    Electronic Resource
    Soluble conjugated polymers with degenerate ground state derivatives of poly(1,6-heptadiyne) (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 590-596 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the results of initial measurements on two derivatives of poly(1,6-heptadiyne): a di-ketone (PHDK) and a di-ester (PHDE). Both polymers have the degenerate ground state of poly(1,6-heptadiyne); both are soluble in common organic solvents. Electron spin resonance (ESR) measurements on pristine samples place an upper limit of 10−4 spins per monomer for both polymers. At low doping levels, we observe a single doping-induced absorption band at an energy of approximately half the π−π* gap, Eg/2; the doping-induced spectral features were fully reversible. In situ ESR and absorption measurements during doping show that charge is stored predominantly in spinless charge carriers. Because of the inequivalent carbons on the conjugated backbone, the results are discussed in terms of the (A=B)n polymer. Both PHDK and PHDE are relatively stable in air; the strength of the π−π* absorption band is nearly constant over a period of a week in air, decreasing to 80% of the initial value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465785
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  • 5
    Electronic Resource
    Electronic Resource
    Photo-oxidation of electroluminescent polymers studied by core-level photoabsorption spectroscopy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2046-2048 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The C 1s and O 1s core-level photoabsorption spectra of poly[2-methoxy,5-(2′-ethyl- hexoxy)-1,4-phenylene vinylene] (MEH-PPV) before and after exposure O2 and broadband visible light were recorded to determine the degradation pathway for this polymer. The change in the O 1s spectra as a function of exposure demonstrates that the O adds to the polymer chain to form a carbonyl group. Exposure to only O2 or only light causes no change in the C 1s or O 1s spectra. In the C 1s spectra, the change in the dependence on the photon angle of incidence after exposure demonstrates that O attacks the polymer at the double bond in the vinyl group thereby altering the extended conjugation of the polymer. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116298
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  • 6
    Electronic Resource
    Electronic Resource
    Alignment of fluorescent molecules vapour-deposited on to highly oriented PTFE substrates (1996)
    Springer
    Journal of materials science 31 (1996), S. 915-920 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The alignment of six fluorescent materials (p-terphenyl, p-quaterphenyl, p-quinquephenyl, diphenylstilbene, 1,4-bis(2-methylstyryl)benzene, and 1,4-bis-2-(5-phenyloxazolyl)benzene) grown from the vapour phase on to friction-deposited, highly oriented poly(tetrafluoroethylene) (PTFE) films was studied. The dichroic ratio of the fluorescent films produced was determined by polarized spectroscopic fluorescence measurements, and the crystallographic orientation of these materials was determined by transmission electron microscopy. The measured dichroic ratios ranged from 1.7 for diphenylstilbene to 5.0 for the p-quaterphenyl film. Electron diffraction patterns revealed that five of the fluorescent materials grew epitaxially on the single crystal-like PTFE films, the fluorescent crystals adopting particular orientations with respect to the crystallographic planes of PTFE. On the other hand, crystals of 1,4-bis-2-(5-phenyloxazolyl) benzene aligned in a fibre pattern, apparently by a grapho-epitaxial mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00352890
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