Charge carrier transport in polyvinylcarbazole

Tyutnev, A. P.; Saenko, V. S.; Pozhidaev, E. D.; Kolesnikov, V. A.

doi:10.1088/0953-8984/18/27/019

Cited by 26 publications

(15 citation statements)

References 36 publications

(51 reference statements)

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“…Carbazole-based polymers such as poly(Nphenylcarbazole-2,7-ylene)s have somewhat higher HOMO levels (ca. -5.5 eV) [25] than those of polynaphthalenes, while poly(vinylcarbazole) (PVK) has been known as a hole transporting material [26] regardless of the low HOMO level (-5.8 eV). Therefore, we adopt two strategies to improve performance of poly(2,6-naphthalene) derivatives for PLEDs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and electroluminescence properties of carbazole-containing 2,6-naphthalene-based conjugated polymers

Mori

Kijima

2009

European Polymer Journal

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Three types of carbazole containing 1,5-disubstituted poly(2,6-naphthalene) derivatives, i. e., 2,6-naphthalene homopolymer that has a carbazolyl side chain at 1,5-positions, random copolymers and alternating copolymers consisting of 1,5-dialkoxynaphthalene-2,6-diyl and N-phenylcarbazole-2,7diyl were newly synthesized by Ni-mediated Yamamoto polycondensation and Pd-catalyzed Suzuki coupling reaction. The number-average molecular weights (M n ) of the polymers and their polydispersity indices (M w /M n ) were 5.4-8.2×10 3 and 1.4-1.7, respectively. These polymers exhibited blue photoluminescence in the film states and high fluorescence quantum efficiencies in CHCl 3 (φ fl = 0.70-1.00). The electroluminescence properties of these polymers were investigated by fabricating a PLED device that has a configuration of ITO/PEDOT(PSS)/polymer/CsF/Al. The device fabricated with the random copolymer exhibited highest performances showing a maximum brightness of 8370 cd/m 2 at 13 V and a maximum efficiency of 2.16 cd/A at 7 V. Kanto Chemical, Tokyo Chemical Industry, Aldrich and Nacalai Tesque Inc. N,N-Dimethylformamide (DMF), acetonitrile and tetrahydrofuran (THF) were used after purification by distillation using an appropriate drying reagent such as molecular sieves and Na, respectively, under argon. Other chemicals were used as received without further purification. 5-Bis[6-(carbazol-9-yl)hexyloxy]-2,6-dibromonaphthalene (3) 1,5-Bis[6-(carbazol-9-yl)hexyloxy]-2,6-dibromonaphthalene (3) was synthesized by the modified procedure reported in our previous work. [23] Under an argon atmosphere, a solution of 2,6-dibromo-1,5-dihydroxynaphthalene 1 (0.76 0g, 2.39 mmol), KOH (0.530 g, 9.45 mmol) in EtOH (25 ml) was refluxed for 30 minuets. Afterwards, N-(6-bromohexyl)carbazole 2 (3.20 g, 9.69 mmol) was added to the solution, which was successively refluxed for 24 hours, cooled to room temperature, and dissolved in CH 2 Cl 2 . The organic layer was washed with NaOH aq, water and brine, and was dried over anhyd. 1,Na 2 SO 4 . After removing the solvent, the resultant black residue was chromatographed on silica gel (CH 2 Cl 2 /hexane= 1:1) to afford a yellow solid, which was recrystallized from hexane/CH 2 Cl 2 to obtain pure 3 (0.80 g, yield: 41 %). 1 H NMR (270 MHz, CDCl 3 ) δ = 1.55, 1.65 (m, 8H), 1.91 (m, 8H), 4.01 (t, J = 6.43, 4H), 4.35 (t, J = 7.25, 4H), 7.23 (m, 4H), 7.48 (m, 8H), 7.57 (d, J = 9.06, 2H), 7.65 (d, J = 9.06, N-phenyl-2,7-Bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolate) carbazole (6a)Under an argon atmosphere, to a solution of N-phenyl-2,7-dibromocarbazole (5a) (0.150 g, 0.399 mmol), PdCl 2 [1,1′-Bis(diphenylphosphino)ferrocene](II) (0.0195 g, 0.0239 mmol), KOAc (0.234 g, 2.39 mmol) in DMF (5 ml) was added bis(pinacolato)diborane (0.223 g, 0.878 mmol), which was refluxed for 24 hours. After cooling to room temperature, CH 2 Cl 2 was added to the solution. The organic layer was washed with water and brine, and was dried over anhyd. Na 2 SO 4 . After evaporation, a black residue was obtained, which was purified by a s...

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Section: Introductionmentioning

confidence: 99%

Synthesis and electroluminescence properties of carbazole-containing 2,6-naphthalene-based conjugated polymers

Mori

Kijima

2009

European Polymer Journal

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“…Hole transport in TFB is nondispersive, whereas that in PVK is dispersive. [42][43][44] For the TFB/PVK device, holes were transported dispersively in the PVK layer and injected into the EML; thus, the EL of this device increased gradually.…”

Section: Analysis Of Device Dynamicsmentioning

confidence: 99%

Lifetime elongation of quantum-dot light-emitting diodes by inhibiting the degradation of hole transport layer

et al. 2021

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“…In case of non-truncated exponential density of localized states, dispersive transport (α = kT /ε 0 = 0.5) is observed. The truncation of ρ(ε) at χε 0 transforms transient current curves not only in the tail t ≫ t T , it can lead to the 13) and (18). appearance of a plateau.…”

Section: Photocurrent Decay In the Time-of-flight Experimentsmentioning

confidence: 99%

“…These phenomena covered by term anomalous or generalized transport are not compatible with the local equilibrium hypothesis. The non-Gaussian properties of the transport are observed in amorphous hydrogenated silicon [7,2], amorphous selenium [12,13], amorphous chalcogenides [14,15], organic semiconductors, polymers, [16,17,18], porous solids [19,20,21], nanostructured materials [22], polycrystalline films [23], liquid crystals [24], etc. Investigation of such processes represents one of the main trends in contemporary non-equilibrium thermodynamics and statistical mechanics [5].…”

Section: Introductionmentioning

confidence: 99%

Transient processes in disordered semiconductor structures under dispersive transport conditions: Fractional calculus approach

Sibatov¹,

Учайкин²

2013

Preprint

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We continue to develop a new approach to description of charge kinetics in disordered semiconductors. It is based on fractional diffusion equations. This article is devoted to transient processes in structures under dispersive transport conditions. We demonstrate that this approach allows us (i) to take into account energetic and topological types of disorder in common, (ii) to consider transport in samples with spatial distributions of localized states, and (iii) to describe transport in non-homogeneous materials with distributed dispersion parameter. Using fractional approach provides some specifications in interpretation of time-of-flight experiments in disordered semiconductors.

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Charge carrier transport in polyvinylcarbazole

Cited by 26 publications

References 36 publications

Synthesis and electroluminescence properties of carbazole-containing 2,6-naphthalene-based conjugated polymers

Synthesis and electroluminescence properties of carbazole-containing 2,6-naphthalene-based conjugated polymers

Lifetime elongation of quantum-dot light-emitting diodes by inhibiting the degradation of hole transport layer

Transient processes in disordered semiconductor structures under dispersive transport conditions: Fractional calculus approach

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