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  • 1
    Electronic Resource
    Electronic Resource
    Geminate charge pair recombination in sensitized photoconducting polymer (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 5611-5616 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recombination kinetics of the geminate charge pairs, generated by photoexcitation of charge transfer (CT) complexes in sensitized poly-N-epoxypropylcarbazole, have been investigated by transient absorption and time-resolved fluorescence techniques and modeled by Monte Carlo method. The quantitative agreement of simulations with experimental data is obtained by assuming the distance between the thermalized charge pairs to be several times longer than the typical distance between electron donor and acceptor in CT complexes. Faster recombination is observed in the films with higher sensitizer concentrations and explained by assuming that electron acceptor molecules act as scattering centers for hole motion during thermalization, thus reducing the thermalization distance. The dynamical blue shift of the fluorescence band and comparison of hole density with fluorescence kinetics suggest that heterogeneity of CT complexes results in different radiative probabilities and in distribution of the initial charge pair separation distances. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479819
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Manifestation of the transition from the excited state by means of femtosecond four-wave mixing spectroscopy (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 1203-1213 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The influence of the transition from the excited state on the coherent transients of pump-probe measurements in a three-level system is discussed. A theoretical study related to a selective scheme of differential absorption pump-probe spectroscopy is performed in the framework of a full semiclassical description of the interaction of light and matter. It is demonstrated how the coherent part of the modified signal may be used for detection of the up-transition from the excited state. Annihilation processes characteristic of molecular aggregates at high pump intensities are taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347651
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spectroscopy of excitons in the polar molecular crystal DMABI (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 387-390 
    Details
    ISSN: 1057-9257
    Keywords: molecular crystals ; N,N-dimenthylaminobenzylidene 1,3-indandione ; spectroscopy ; luminescence ; self-trapped excitons ; charge transfer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: This paper considers the origin of the excited states and spectroscopic features of polar molecular compounds of N,N-dimethylaminobenzylidene 1,3-indandione (DMABI). Evidence of a strong exciton-phonon interaction and its effects on the exciton absorption and luminescence spectra was discovered. The spectral features were related to the crystal structure and were ascribed to self-trapped charge transfer excitons. A weak, narrow luminescence line was also observed in resonance with the lowest absorption band and was attributed to free exciton radiative recombination.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Non-linear luminescence of dimethylaminobenzylidene-1,3-indandione solids (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 391-394 
    Details
    ISSN: 1057-9257
    Keywords: dimethylaminobenzylidene-1,3-indandione ; solids ; non-linear luminescence ; exciton-exciton annihilation ; pump-probe and luminescence spectroscopy ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The origin of the non-linear anti-Stokes luminescence effect in dimethylaminobenzylidene-1, 3-indandione (DMABI) crystals, i.e. the luminescence in the visible spectral region created by infrared excitation, was investigated by means of ultrafast pump-probe and luminescence spectroscopy. In contrast with the previously proposed luminescence excitation model based on low-energy exciton annihilation, the luminescence state was found to be excited via two-photon absorption through virtual and real (characterised by 1 ps lifetime) intermediate states. Second-harmonic generation and pulse duration effects on the non-linear luminescence are discussed. Exciton-exciton annihilation on the manifold of luminescent states was observed at high excitation intensities.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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