A Family of Electroluminescent Silyl-Substituted Poly(p-phenylenevinylene)s:  Synthesis, Characterization, and Structure−Property Relationships

Abstract

A series of intense photoluminescent (PL) polymers containing silyl groups with chain length from C1 to C18 has been successfully synthesized through polycondensation reaction. Introducing silyl groups into a conjugated polymer affords the polymer good processability, amorphousness, good film-forming ability, and sharp emission. A systematic analysis of this series of polymers indicates that increasing the side chain length of the polymers will slightly lower the thermal stability while increasing the molecular weight. UV−vis absorption and PL emission spectra of the polymers are quite similar. Cyclic voltammetric (CV) investigation of the polymers reveals that the side chain length plays an important role in the redox behavior of the polymers. Shorter side chain polymers possess better reproducibility of CV scans and higher peak currents, which implies that the chemical/electrical stability and charge injection and/or transporting ability for shorter side chain polymers are better than those for longer ones. Devices fabricated from poly[2,5-bis(decyldimethylsilyl)-1,4-phenylenevinylene] (DS-PPV) with the configuration of ITO/DS-PPV/Mg:Ag and ITO/PEDOT:PSS/DS-PPV/Mg:Ag indicate that the hole injection is the determining factor for device performance. Addition of the hole injection layer can improve the current efficiency and power efficiency by about 7 times and lower the turn-on voltage from 7.5 to 4.0 V for the two types of devices.

Mechanochemical Synthesis and Characterization of conductive Polyaniline Catalyzed by Maghnite-H+ (Algerian Montmorillonite﴿.

“…These properties optical and electrical of polyaniline widen his application in several estate such as electronics devices (organo semi conductors, transistors),batteries and combustible piles .In many articles, preparation of polyaniline (PANI) soluble has been subjected [2] ,this very day, polymerization of aniline in montmorillonite(layered solid) by chemical methods have been reported [3]. The solubilization [4] of polyaniline is important parameter for studding, this physical propertie depend on the route of the synthesis of polymer.…”

A new conjugated polymer with donor-acceptor architectures based on alternating 1,4-divinyl-2,5-dioctyloxybenzene and 5,8-(2,3-dipyridyl)-quinoxaline: Synthesis, characterization, and photoinduced charge transfer

“…The CV band-gap of polymer PPV-BD is 2.40 eV is slightly larger than its optical band. The discrepancy of values lies within the range of errors, and this discrepancy is probably due to interface barrier for charge injection [34,35].…”

Synthesis and Light-emitting Properties of Random Copolymers Composed of Phenylsilyl- and Alkoxy-Sustituted Phenylenevinylene

“…Huang et al reported that silylsubstituted PPVs have few structural defects in their polymer chains, and that the silyl groups contribute to the satisfactory solubility of these polymers, because of the larger atomic size of Si compared to C and O, as well as the longer bond length of Si-C compared to C-C and C-O [12]. The molecular weights of the polymers were measured by gel permeation chromatography, using THF as eluent, and polystyrene as standard.…”