The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper describes the synthesis of a solution-processable and thermally cross-linkable 2,7-bis-[4-bis(4-vinylphenyl)aminophenyl]-9,9-dihexylfluorene (VTF) and its application as hole-transporting layer in multilayer polymer light-emitting diodes (PLEDs). The thermal, photophysical, and electrochemical properties of VTF were investigated by differential scanning calorimetry, thermogravimetric analysis,...
This paper describes the synthesis of a new thermally cross-linkable hole-transporting poly(fluorene-co-triphenylamine) (PFTV) by Suzuki coupling reaction and its application in polymer light-emitting diodes (PLEDs). The characteristics of PFTV were analyzed by 1 H NMR, differential scanning calorimetry, optical spectroscopy, cyclic voltammetry, and atomic force microscopy. Its HOMO level...
This paper demonstrates synthesis of hyperbranched polymers (HTP and HTPOCH 3 ), containing triphenylamine moieties in main chain and thermally cross-linkable periphery or terminal vinyl groups, and application as hole-transporting layer (HTL) in multilayer light-emitting diodes. Absorption and photoluminescence (PL) spectroscopy, cyclic voltammetry (CV) and differential scanning calorimetry...
Poly(9-vinylcarbazole-co-4-vinyltriphenylamine)s, PVKT21 and PVKT45 with 21 mol% and 45 mol% pendant triphenylamine groups respectively, were electrochemically deposited as crosslinked thin films through electrocoupling of pendant triphenylamine moieties during the oxidation process. The electrocoupling process has been elucidated by electrochemical and spectroelectrochemical investigations which...
This paper describes the synthesis of new copolyfluorenes (P05–P5) slightly doped with 2,5-bis(2-phenyl-2-cyanovinyl)thiophene (GM, <3.4 mol%) and their application in electroluminescent (EL) devices. In film state, EL spectra of the copolyfluorenes are very different from photoluminescence (PL) spectra, which have been ascribed to charge trapping in GM and energy transfer from fluorene segments...
A series of vinyl copolymers (PVKST12–PVKST91) and homoploymer PVST containing pendant hole-transporting 4-(4-oxystyryl)triphenylamine (12–100mol%) and carbazole chromophores were synthesized by radical copolymerization and employed as host for Ir(ppy) 3 phosphor to tune emission color. They were characterized using the 1 H NMR, FT-IR, absorption and photoluminescence spectra, elemental...
A series of vinyl copolymers (P1–P6) containing pendant hole-transporting triphenylamine (11–88mol%) and carbazole chromophores were synthesized by radical copolymerization to investigate the influence of triphenylamine groups upon optoelectronic properties. The copolymers were readily soluble in common organic solvents and their weight-average molecular weights (M w s) were between 1.41×10...
We prepared three new poly(9,9-dihexylfluorene) derivatives (P1–P3) containing kinked aromatic triazole (triphenyl-1,2,4-triazole derivative) via Suzuki coupling polymerization. These copolymers were soluble in common organic solvents and showed high decomposition temperatures (T d =416–454°C). The optical and electrochemical properties of P1–P3 were compared with poly(9,9-dihexylfluorene)...
We prepared and characterized three new copoly(aryl ether)s (P1–P3) consisting of alternate electron-transporting 2,7-bis(3-(trifluoromethyl)phenyl)-9,9-dihexylfluorene and hole-transporting fluorophores (P1: 3,6-distyryl-N-2-ethylhexylcarbazole; P2: 2,7-distyryl-9,9-dihexylfluorene; P3: 1,4-distyryl-2,5-dihexylbenzene) separated by ether spacers. The copolymers were soluble in common organic solvents...
In an attempt to balance energy barriers of hole and electron injection we prepared and characterized homopolymer containing electron-transporting 1,2-diphenylmaleimide chromophores (P1) and copolymers consisting of 1,2-diphenylmaleimide and hole-transporting 2,5-thiophene moieties (P2, P3) via dehalogenation polycondensation. The copolymers are amorphous materials with decomposition temperature greater...
Two soluble poly(1,4-phenylene vinylene-4,4′-biphenylene vinylene)s (P1, P2) were synthesized through the Wittig condensation, in which P1 and P2 contain flexible oligo(ethylene oxide) and hexyloxy side groups, respectively. Furthermore, a blend of P1 with lithium perchlorate (P1–LP) was obtained to investigate the effect of doping. The polymers show good solubility in common organic solvents and...
Three novel copoly(aryl ether)s, consisting of alternate isolated hole-transporting (2,5-dihexyloxy-1,4-distyrylbenzene) and electron-transporting (p-quaterphenyl or aromatic 1,3,4-oxadiazole) segments, were synthesized from corresponding bis(phenol) and bis(fluoride) monomers by nucleophilic displacement reaction. These copolymers are soluble in common organic solvents and exhibit good thermal stability...
New copoly(aryl ether)s containing alternate stilbene (P1), distyrylbenzene (P2), or distyrylstilbene (P3) chromophores and aromatic 1,3,4-oxadiazole were prepared by nucleophilic polycondensation. The copolyethers are basically amorphous materials with decomposition temperature greater than 250 o C. Introduction of side hexyloxy groups to distyrylbenzene chromophores in P2 significantly enhanced...
Novel copolymers carrying N-hexyl-3,8-iminodibenzyl chromophores have been synthesized by polycondenzation of N-hexyl-3,8-diformylminodibenzyl with 1,4-xylylene-bis(diethylphosphonate) via the Horner reaction (P1) or with 1,4-phenylenediacetonitrile via the Knoevenagel reaction (P2). The reduced viscosities of P1 and P2 are 1.17 and 0.43dl/g, respectively. The P2 with electron-withdrawing CN groups...
Three poly(aryl ether)s consisting of alternate isolated blue chromophore (substituted p-aryl vinylene) and electron transport structure (1,3,4-oxadiazole) have been synthesized and characterized. The poly(aryl ether)s (η red >0.5dl/g) were obtained by nucleophilic displacement reaction of oxadiazole-activated bis(fluoride) monomers with bis(phenol) monomers. Introduction of ether...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.