			Home About us Contact

Conjugated Poly (conjugated + poly)

Distribution by Scientific Domains

Polymers and Materials Science	75%

Selected Abstracts

Lateral Inhomogeneity in the Electronic Structure of a Conjugated Poly(3-hexylthiophene) Thin Film

ADVANCED FUNCTIONAL MATERIALS, Issue 13 2010
Kaname Kanai
Abstract How annealing influences the morphology of a highly regioregular poly(3-hexylthiophene) (RR-P3HT) film at the substrate interface as well as the lateral inhomogeneity in the electronic structure of the film are elucidated. Whereas previous studies have reported that high-molecular-weight (MW) RR-P3HT films tend to show low crystallinity even after annealing, it is found that high-MW RR-P3HT does show high crystallinity after annealing at high temperature for a long time. Photoemission electron microscopy (PEEM), X-ray photoemission spectroscopy, and ultraviolet photoemission spectroscopy results clearly resolve a considerable lateral inhomogeneity in the morphology of RR-P3HT film, which results in a variation of the electronic structure depending on the local crystallinity. The PEEM results show how annealing facilitates crystal growth in a high-MW RR-P3HT film. [source]

Novel ,-Conjugated Poly(Schiff base) Containing Thiazole and Tetrathiatetrahydropentalene Moieties

CHINESE JOURNAL OF CHEMISTRY, Issue 6 2005
Jiang Li-Ming
Abstract A new kind of ,-conjugated heterocyclic poly(Schiff base) was firstly prepared by the condensation reaction between tetrathiatetrahydropentalene-type diketone and bithiazole-diamine in good yields. The polymers were characterized by VPO, FTIR and 1H NMR spectroscopy. A large bathochromic shift was observed in UV-Vis spectra for these polymers due to the ,-,* transition in the conjugated main chain. Brief examination indicated that the nitrogen- and sulfur-containing polymers exhibited an excellent chelating tendency to metal ions and the corresponding polymeric complexes would be expected to have potential in applications. [source]

Synthesis, optical properties, and electroluminescence of conjugated poly(p -phenylenevinylene) derivatives containing 1,3,4-oxadiazole and pyridine rings in the main chain

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 13 2004
John A. Mikroyannidis
Abstract Three new poly(p -phenylenevinylene) derivatives,PO, POD, and POP,with oxadiazole and pyridine rings along the main chain were synthesized via Heck coupling. The polymers were amorphous and dissolved readily in common organic solvents. They showed relatively low glass-transition temperatures (up to 42 °C) and satisfactory thermal stability. Solutions of the polymers emitted blue-greenish light with photoluminescence (PL) emission maxima around 460 nm and PL quantum yields of 0.28,0.49. Thin films of the polymers displayed PL emission maxima at 461,521 nm, and their tendency to form aggregates was significantly influenced by the chemical structure. Light-emitting diodes with polymers PO and POP, with an indium tin oxide/poly(ethylenedioxythiophene) (PEDOT)/polymer/Ca configuration, emitted yellow and green light, respectively, and this could be attributed to excimer emission. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 3212,3223, 2004 [source]

Synthesis, characterization, and electroluminescence of new conjugated PPV derivatives bearing triphenylamine side-chain through a vinylene bridge

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 12 2007
Zhan'ao Tan
Abstract Three new conjugated poly(p -phenylene vinylene) (PPV) derivatives bearing triphenylamine side-chain through a vinylene bridge, poly(2-(4,-(diphenylamino)phenylenevinyl)-1,4-phenylene-vinylene) (DP-PPV), poly(2-(3,-(3,,7,-dimethyloctyloxy)phenyl)-1,4-phenylenevinylene- alt -2-(4,- (diphenylamino)phenylenevinyl)-1,4-phenylenevinylene) (DODP-PPV), and poly(2-(4,-(diphenylamino)phenylenevinyl)-1,4-phenylenevinylene-co-2-(3,,5,-bis(3,,7,-dimethyloctyloxy)-1,4-phenylenevinylene) (DP-co-BD-PPV), were synthesized according to the Gilch or Wittig method. Among the three polymers, the copolymer DP-co-BD-PPV is soluble in common solvents with good thermal stability with 5% weight loss at temperatures higher than 386°C. The weight-average molecular weight (Mw) and polydispersity index (PDI) of DP-co-BD-PPV were 1.83,×,105 and 2.33, respectively. The single-layer polymer light-emitting diodes (PLEDs) with the configuration of Indium tin oxide (ITO)/poly (3,4-ethylenedioxythiophene): poly(4-styrene sulfonate)(PEDOT:PSS)/DP-co-BD-PPV/Ca/Al were fabricated. The PLED emitted yellow-green light with the turn-on voltage of ca. 4.9,V, the maximum luminance of ca. 990,cd/m2 at 15.8,V, and the maximum electroluminescence (EL) efficiency of 0.22,cd/A. Copyright © 2007 John Wiley & Sons, Ltd. [source]