Poly(p-phenylenevinylene) by chemical vapor deposition : synthesis, structural evaluation, glass transition, electroluminescence, and photoluminescence

Titelangaben

Schäfer, Oliver ; Greiner, Andreas ; Pommerehne, Jörn ; Guss, W. ; Vestweber, Horst ; Tak, Y.-H. ; Bässler, Heinz ; Schmidt, C. ; Lüssem, Georg ; Schartel, Bernhard ; Stümpflen, Volker ; Wendorff, Joachim H. ; Spiegel, Stefan ; Möller, Claudia ; Spiess, Hans Wolfgang:
Poly(p-phenylenevinylene) by chemical vapor deposition : synthesis, structural evaluation, glass transition, electroluminescence, and photoluminescence.
In: Synthetic Metals. Bd. 82 (1996) Heft 1 . - S. 1-9.
ISSN 0379-6779
DOI: https://doi.org/10.1016/S0379-6779(97)80001-X

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Abstract

Poly (p-phenylenevinylene) (PPV) was prepared via chemical vapor deposition (CVD) by vapor phase pyrolysis of alpha,alpha'-dihalogenated p-xylenes or alpha,alpha-dihalogenated p-xylenes. Differences in the product composition obtained are discussed. The advantages for the film formation as well as the limitations are reported with respect to the fabrication of light-emitting diode (LED) cells. PPV films were characterized by various techniques. They show a glass transition temperature at 220 degrees C, a hypsochromic shift of the S-1 —> S-0 transition and higher degree of disorder as compared to ordinary PPV. The current-voltage characteristics of LED cells with PPV prepared via CVD show an unusually high rectification ratio. In contrast to PPV annealed at lower temperatures the formation of an unidentified defect structure was detected by C-13 CP-MAS/TOSS spectroscopy with PPV films annealed at higher temperatures.