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    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 2332-2336 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photophysical properties of poly(2,5-pyridine diyl) (PPY) are characterized in detail using steady state measurements, time correlated single photon counting techniques, and excitation pulse energy dependence of the photoluminescence intensity. Our results show that the blue emission from dilute solution is prompt fluorescence (lifetime ∼10 ps). On the other hand, the green emission from thin solid film consists of phosphorescence as well as delayed fluorescence with lifetimes of ∼4.8 ns and 1.1 ns, respectively. Oxygen complexation plays an important role and increases triplet population in thin film. At low excitation pulse energies, emission in thin film originates mostly from the triplet state, while at higher excitation pulse energies, delayed fluorescence becomes the major part in the emission. Also, at low temperature (20 K), an excimerlike emission is observed to the red side of the PPY emission spectrum in thin film, which is only induced by pressure. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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