Alternating copolymers poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (P1) and poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-1,4-phenylene] (P3) were synthesized by the palladium-catalyzed Suzuki coupling reaction their quaternized ammonium polyelectrolyte derivatives (P2, P4) obtained through a postpolymerization treatment on terminal amino groups. The resulting conjugated polyelectrolytes are soluble in polar solvents such as...

A novel series of semiconducting conjugated copolymers, derived from alkyl-substituted fluorene, 4,7-diselenophen-2'-yl-2,1,3-benzothiadiazole (SeBT), and 4,7-diselenophen-2'-yl-2,1,3-benzoselenadiazole (SeBSe), was synthesized by a palladium-catalyzed Suzuki coupling reaction with various feed ratios. The optical band gap copolymers is very low, 1.87 eV for SeBT 1.77 SeBSe. efficient fast energy transfer fluorene segments to narrow-band-gap sites observed. emission photoluminescence...

Highly efficient polymer white-light-emitting devices with a single emission layer containing sky–blue triplet emitter and some home-made yellow phosphorescent iridium complexes doped into host are fabricated. The optimized present CIE coordinates of (0.395,0.452) at current density 12 mA cm−2. Detailed facts importance to specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by the authors....

A series of novel soluble conjugated copolymers derived from 9,9-dioctylfluorene (DOF) and 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DBT) were synthesized by a palladium-catalyzed Suzuki coupling reaction with different feed ratios DOF to DBT. Owing exciton confinement on the DBT site, emission is centred chromophore gives rise saturated red emission. Polyfluorene fluorescence quenched completely at concentrations as low 1% in solid film. Devices based these emit light. Chromaticity...

A series of aminoalkyl-substituted polyfluorene copolymers with benzothiadiazole (BTDZ) different content were synthesized by Suzuki coupling reaction, and their quaternized ammonium polyelectrolyte derivatives obtained through a postpolymerization treatment on the terminal amino groups. Copolymers are soluble in environmentally friendlier solvents, such as alcohols. It was found that efficient energy transfer occurs exciton trapping narrow band gap BTDZ site under UV illumination. Only 1%...

Efficient and almost pure white-light emission is obtained by combining singlet triplet in a single-polymer device. The polymers used this work include benzothiadiazole group attached to fluorene backbone an iridium complex the side chain (see figure). White-light with CIE color coordinates of (0.32, 0.44) luminance efficiency 6.1 cd A–1 obtained.

Novel soluble conjugated random copolymers are synthesized by palladium-catalyzed Suzuki coupling reaction from 9,9-dioctylfluorene (DOF) and 4,7-di(4-hexylthien-2-yl)-2,1,3-benzothiadiazole (DHTBT) with DHTBT composition varying 1 to 50 mol % in the copolymer. All of polymers common organic solvents highly photoluminescent. Polyfluorene fluorescence is quenched completely at a concentration as low 1% solid film. The copolymer films fluorescent under UV irradiation contrast its parent...

It has been previously shown that incorporating alcohol/water-soluble conjugated polyelectrolytes (CPEs) as cathode interlayers can substantially enhance the open-circuit voltage (Voc) of bulk heterojunction polymer solar cells (PSCs). This improvement is attractive since there are only a few solution-based processing technologies Voc. In this article, Voc enhancement effect five distinct CPE materials was studied on three typical PSC device configurations, each using different donor...

The synthesis and properties of a single copolymer incorporating well-separated blue, green, red chromophores on conjugated polymer backbone are reported. This is shown to have CIE coordinates (0.35,0.34) luminance efficiency 6.2 cd A–1. color the resulting white-light emission remained extremely stable over wide range driving voltages.

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTNovel Electroluminescent Polymers Derived from Carbazole and BenzothiadiazoleJian Huang, Yuhua Niu, Wei Yang, Yueqi Mo, Ming Yuan, Yong CaoView Author Information Institute of Polymer Optoelectronic Materials Devices, South China University Technology, Guangzhou, 510640 Cite this: Macromolecules 2002, 35, 16, 6080–6082Publication Date (Web):June 29, 2002Publication History Received5 March 2002Revised27 April...

A series of electrophosphorescent conjugated fluorene-alt-carbazole copolymers are synthesized by Suzuki polycondensation. diketone-ended alkyl chain which is grafted in the N-position carbazole serves as a ligand to form pendant cyclometalated Ir complex with 1-phenylisoquinoline (Piq), 2-naphthylpyridine (Napy), and 2-phenylquinoline (Phq). The PL efficiencies PFCzIrPiq PFCzIrPhq around 60% 70%, respectively. EL emission from backbone completely quenched even though contents polymers low...

We reported that the open-circuit voltage (VOC) of polymer solar cells (PSCs) can be enhanced by 0.3 V via inserting a thin layer alcohol/water-soluble polyelectrolyte between active and metal electrode. The origin increase in VOC attributed to superposition built-in field with interfacial dipole interlayer, existence interlayer as dielectric was confirmed ac impedance spectroscopy. significant enhancement simplicity incorporation solution processing make this method good candidate for...

Abstract A series of blue (B), green (G) and red (R) light‐emitting, 9,9‐bis(4‐(2‐ethyl‐hexyloxy)phenyl)fluorene (PPF) based polymers containing a dibenzothiophene‐ S,S ‐dioxide (SO) unit (PPF‐SO polymer), with an additional benzothiadiazole (BT) (PPF‐SO‐BT polymer) or 4,7‐di(4‐hexylthien‐2‐yl)‐benzothiadiazole (DHTBT) (PPF‐SO‐DHTBT are synthesized. These exhibit high fluorescence yields good thermal stability. Light‐emitting diodes (LEDs) using PPF‐SO25, PPF‐SO15‐BT1, PPF‐SO15‐DHTBT1 as...

A novel series of light-emitting copolymers derived from 9,9-dioctylfluorene (DOF) and 2,1,3-benzoselenadiazole (BSeD) is prepared by means palladium-catalyzed Suzuki coupling reaction. The feed ratios DOF to BSeD were 50:50, 85:15, 92:8, 98:2, respectively. All the are soluble in common organic solvents highly fluorescent solid state. Devices such emit orange-red light with λmax = 570−600 nm. maximal EL emissions devices slightly red-shifted gradually increasing BSeD's contents. external...

Iridium complexes with alkyl substituted 2-phenylpyridine, Ir(Bu-PPy)3, were synthesized. Polymer light emitting diodes Ir as the guest materials and polyphenylenes host fabricated. Ir(Bu-PPy)3-doped Poly(2-(6-cyano-6-methyl)- heptyloxy-1,4-phenylene) (CNPPP) device showed generally higher quantum efficiency (QE) than that of Ir(PPy)3-doped for a given dopant concentration. More importantly, addition butyl group into phenylpyridine ligand significantly suppresses decay at high current...

A variety of novel light-emitting copolymers derived from 9,9-dioctylfluorene (DOF) and 2,1,3-naphthozoselenadiazole (NSeD) were prepared by the palladium-catalyzed Suzuki coupling reaction. The feed ratios DOF to NSeD 99.9:0.1, 99.5:0.5, 99:1, 98:2, 95:5, 85:15. All polymers are soluble in common organic solvents highly fluorescent solid state. Devices based on emit saturated red light, emission slightly red-shifted gradually with increasing NSeD's contents. maximal external quantum...

Spectrally stable blue-light-emitting polyfluorenes with high efficiency were realized via incorporating dibenzothiophene-S,S-dioxide (SO) isomer (3,7-diyl or 2,8-diyl) into the poly[9,9-bis(4-(2-ethylhexyloxy)phenyl)fluorene-2,7-diyl] (PPF) backbone. The resulting polymers have fluorescence yield and exhibit very good thermal stability. EL spectra of all copolymers remain almost unchanged, no green emission is observed even at applied current density (more than 360 mA/cm2) annealing...

The synthesis of electrophosphorescent chelating polymers by Suzuki polycondensation A-A- and B-B-type monomers is described, in which the fluorene-alt-carbazole (PFCz) segment used as polymer backbone. By using alkyl-substituted ligands iridium complex monomers, copolymers with higher contents can be synthesized. Chemical photophysical characterization confirm that Ir incorporated into backbone one monomer repeat units means two 5-bromotolylpyridine ligands. Chelating complexes conjugated...

A series of new 2,7-dioctyl-substituted dibenzo[a,c]phenazine (BPz) derivatives were designed and synthesized as electron-deficient units, which copolymerized with an electron-rich indacenodithiophene (IDT) to construct narrow-band-gap copolymers PIDT–OHBPz, PIDT–OFBPz, PIDT–OBPQ via Stille polycondensation. The 2,7-dioctyl substituents enhanced solubility offered a approach for developing various BPz derivatives. All showed high hole mobilities above 0.01 cm2 V–1 s–1 measured by field...

Efficient white-light-emitting diodes (WPLEDs) based on a polymer codoped with two phosphorescent dyes were fabricated by the spin-casting method. Polyhedral oligomeric silsesquioxane-terminated poly(9,9-dioctylfluorene) (PFO-poss) was used as host and blue light emitter. Phosphorescent emitters, fac-tris[2-(4′-ter-butyl)phenylpyridine] iridium (III) [Ir(Bu-ppy)3] bis-(1-phenylisoquinolyl)iridium(III)(1-trifluoro) acetylacetonate [(Piq)2Ir(acaF)] green red emission, respectively, guests. The...

A series of phosphorescent chelating copolymers based on the linkage isomers 2-(1-naphthalene)pyridine− and 2-(2-naphthalene)pyridine−bicycloiridium complexes were synthesized by Suzuki polycondensation A−A- B−B-type monomers. These isomers-based show distinct differences in their photophysical electroluminescence properties. The emission band copolymer PF1−NpyIrm is region 630 nm, whereas PF2−NpyIrm an with peak maximum at 590 which are both red-shifted around 20 nm compared emissions...

A new series of copolymers (PSiFF) based on 3,6-silafluorene and 2,7-fluorene were synthesized via the Suzuki polycondensation. The influences content in thermal, photophysical, electroluminescence electrochemical properties investigated. incorporation into polyfluorene main chain not only suppressed long-wavelength emission but significantly improved efficiency color purity copolymer-based devices. Both fluorene took part π-conjugation spectra remarkably blue-shifted with increasing wide...

A novel polyfluorene with high triplet energy level the soluble conjugated homopolymer poly(9,9′-bis(2-ethylhexyl)-3,6-fluorene)) (P36EHF) is successfully synthesized and characterized. Preliminary results indicate that P36EHF could be a good host material for green blue phosphorescent complexes (see figure), making it wide-bandgap polymer suitable blue- or green-phosphorescent LEDs. Supporting information this article available on WWW under...