19 May 2000 Structure and optical properties of vacuum-deposited polyparaphenylene films with high efficiency of luminescence
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Proceedings Volume 3939, Organic Photonic Materials and Devices II; (2000) https://doi.org/10.1117/12.386375
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
Abstract
Structure and optical properties of vacuum deposited poly- para-phenylene (PPP) films were investigated by UV-Vis absorption, luminescence, polarized luminescence, FTIR, and electron diffraction methods. It was shown that molecular structure, morphology and spectral parameters of vacuum deposited PPP films drastically depend on evaporation temperature, substrate temperature and distance of substrate from PPP powder. The increase of the evaporation temperature results both in red shift of the luminescence peaks from 480 nm at 650 degrees C to 540 nm at 800 degrees C and in considerable decrease of the photoluminescence intensity. Electron diffraction studies show that the highest degree of crystallinity of PPP films is observed for evaporation temperature 680 degrees C and support temperature 300 degrees C. These conditions yield optically anisotropic films with high luminescence intensity on various substrates. Electron diffraction and polarized optical measurements of highly oriented PPP films indicate that PPP molecules are essentially arrange perpendicularly to the surface of the support. It has been demonstrated that in FTIR spectra of highly oriented PPP films an extremely strong band at 1375 cm-1 is observed. That band is not typical for currently known PPP modifications and could be associated with change in the order of the 'defect' C-C bond between adjacent quinoid and benzenoid units.
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Valerii M. Kobryanskii, Valerii M. Kobryanskii, Svetlana P. Kotova, Svetlana P. Kotova, Nina Zhidkova, Nina Zhidkova, Vera Klechkovskaya, Vera Klechkovskaya, } "Structure and optical properties of vacuum-deposited polyparaphenylene films with high efficiency of luminescence", Proc. SPIE 3939, Organic Photonic Materials and Devices II, (19 May 2000); doi: 10.1117/12.386375; https://doi.org/10.1117/12.386375
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