Münster (Westfalen), Univ., Diss., 2004. / Computerdatei im Fernzugriff.

Freiburg (Breisgau), Universiẗat, Diss., 2001.

Halle, Wittenberg, University, Diss., 2001.

Freiburg (Breisgau), Universiẗat, Diss., 2002.

Bielefeld, University, Diss., 2003.

No description available.

In this research, we studied the phenomenon of energy transfer of polymer phosphorescent light-emitting diodes, PPLEDs. This thesis was divided into three parts: devices constructed by new-type host polymer blended with phosphorescent material, devices constructed by host polymer PVK blended with phosphorescent materials, and devices constructed by new-type phosphorescent polymer materials. The phenomenon of energy transfer between host polymer BP105 and phosphorescent dye Ir(ppy)3 was studied. Second, we chose PVK as a host polymer material, and Ir(ppy)3 as a phosphorescent guest material, to observe whether it can improve efficiency of devices by using energy transfer process. At last we manufactured devices constructed by new-type host polymer blended or bonded with new-type phosphorescent materials, and compared their emitting and energy transfer efficiency. A glycerol-modified PEDOT:PSS layer that used as an anode buffer layer in PLED using super yellow as the emitter was also been studied. It was found the glycerol-modified device showed a larger current density and improved luminescent efficiency then that of the unmodified device.

This research includes two topics. The first topic is prepared a series of poly(methyl methacrylate) (PMMA)-based copolymers through free radical copolymerizations of methyl methacrylate in the presence of the either 2 - vinyl - 4,6 -diamino - 1, 3, 5triazine(VDAT) or vinylbenzyl -thymine (VBT). Using 1H nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), we investigated the thermal properties and hydrogen-bonding interactions within blends of the two copolymers poly(2-vinyl-4,6-diamino-1,3,5-triazine-co-methyl methacrylate) (PVD AT-co-PMMA) and poly(vinylbenzylthymine-co-methyl methacrylate) (PVBT-co-PMMA). A large positive deviation in the behavior of the glass transition temperature determined by using the Kwei equation and DSC analyses indicated that strong multiple hydrogen-bonding interactions existed between the two copolymers. The FTIR and solid-state NMR spectroscopic analyses provided positive evidence for the presence of three hydrogen bonds between the diamino-1,3,5-triazine groups of PVDAT and thymine groups of PVBT. The second topic is synthesized a series of alkyne end-terminated poly(£^-Benzyl L-glutamate) (alkyne-PBLG), which was prepared by the ring-opening polymerization of the N-carboxyanhydride monomer of £^-Benzyl L-glutamate-carboxyanhydride. Then combination of the alkyne-PBLG with polyhedral oligomeric silsesquioxanes (POSS) with eight function groups are prepared through the click reation and formed a peptide-based block polymer with £\-helice and £]-sheet conformations. The thermal properties and structure of these polypeptides were characterized by using 1H NMR and FTIR. The FTIR, solid-state NMR and WXRD spectroscopic analyses provided evidence for the change of secondary structure between POSS and terminated peptide group, so that the conformation of £]-sheets and £\-helices would be influenced by the incorporation of POSS nanoparticle.

Differential scanning calorimetry (DSC), atomic force microscopy (AFM), 1H nuclear magnetic resonance (NMR), one-and two-dimensional fourier transform infrared spectroscopes (FTIR), size exclusion chromatography (SEC), dynamic light scattering (DLS), viscosity analyses have been used to investigate the miscibility behavior, specific interactions and supramolecular structures of poly(vinylbenzyl thymine-co-butyl methacrylate) (PVBT-co-PBMA, T-PBMA) blending with poly(vinylbenzyl adenine-co-styrene) (PVBA-co-PS, A-PS) through multiple hydrogen bonding complex upon varying the vinylbenzyl thymine and vinylbenzyl adenine contents in DNA-like copolymers. We describe FTIR and 1H NMR spectra reveal that hydrogen bonding between VBA and VBT exclusively. In addition, viscosity measurement, SEC, and DLS provide the formation of supramolecular network structure in this binary blend system. A miscibility window exists when the vinylbenzyl thymine and vinylbenzyl adenine fraction in the copolymer is greater than 11 mol% in the A-PS/T-PBMA blend system, as predicted using the Painter¡VColeman association model.

No description available.