Novel Hole‐Transport Material for Efficient Polymer Light‐Emitting Diodes by Photoreaction

Kimoto, Atsushi; Cho, Jun-Sang; Ito, Kiyoshi; Aoki, Daigo; Miyake, Tohru; Yamamoto, Kimihisa

doi:10.1002/marc.200400657

Cited by 51 publications

(27 citation statements)

References 41 publications

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“…In consequence of their good solubility and film forming ability, conjugated dendrimers recently developed to promising materials in optoelectronic devices. [17,18] Structural elements typically include phenylenes, [19] phenylene-ethynylenes, [20,21] phenylene-ethenylenes, [22][23][24] carbazoles, [25] truxenes, [26] and thiophenes. [27] Thiophenebased materials typically exhibit excellent charge transport properties.…”

Section: Introductionmentioning

confidence: 99%

Solution‐Processed Bulk‐Heterojunction Solar Cells Based on Monodisperse Dendritic Oligothiophenes

Fonrodona

Schikora

et al. 2008

Adv Funct Materials

221

187

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A novel family of soluble conjugated dendritic oligothiophenes (DOTs) as monodisperse 3D macromolecular architectures was characterized with respect to optical and redox properties in solution and in solid films. Band gaps of 2.5–2.2 eV, typical for organic semiconductors, were determined as well as HOMO/LUMO energy levels ideal for efficient electron transfer to acceptors such as [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) identifying them as suitable materials for solar cell applications. Solution‐processed bulk‐heterojunction solar cells using DOTs as electron donor and PCBM as acceptor were prepared and investigated. High open‐circuit voltages VOC of 1.0 V and power‐conversion efficiencies up to 1.72% were obtained for the DOT‐based devices. The higher generations DOTs provide the highest efficiencies. Based on the monodispersity of the DOTs, an analysis of the molar ratio between donor and acceptor in the blended film was possible leading to an optimal value of five to six thiophene units per PCBM.

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Section: Introductionmentioning

confidence: 99%

Solution‐Processed Bulk‐Heterojunction Solar Cells Based on Monodisperse Dendritic Oligothiophenes

Fonrodona

Schikora

et al. 2008

Adv Funct Materials

221

187

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“…Although considerable efforts in the exploration of light‐harvesting dendritic porphyrins with flexible3b,3f,3m,3n andrigid [3c–3e,3g,3h,3k,3l,3o] dendrons have already been made, the development of π‐conjugated porphyrin‐containing dendrimers is still the subject of much attention. On the other hand, carbazole is a promising building block for dendritic construction because of its chemical structure and special electronic and optical properties 2i,2k,4. Construction of a rigid carbazole dendron around a porphyrin core may result in interesting photochemical, electrochemical, and catalytic properties, but there has so far been no example of a porphyrin directly covalently linked to a carbazole dendron.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Carbazole‐Based Dendrimers with Porphyrin Cores

Qiu

et al. 2006

Eur J Org Chem

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“…7). By the incorporation of stannous chloride into the dendrimer, the turn‐on voltage was reduced, and the luminescent efficiency was increased; in this way, a drastic improvement was achieved in the device characteristics 40–44…”

Section: Deployment To Functional Dendrimer Materialsmentioning

confidence: 99%

Dendrimer complexes: Fine control of metal assembly in macromolecules

Yamamoto

2005

J. Polym. Sci. A Polym. Chem.

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New phenylazomethine dendrimers have been developed, with each dendrimer having a unique single structure. From ultraviolet–visible absorption spectra, we determined that stannous chloride added to dendritic polyphenylaz omethine (DPA) was assembled in a stepwise manner from the core shell to the periphery. The selective binding was achieved by the electron density gradient formed in the dendrimer, and it was confirmed by shell‐selective imine reduction, transmission electron microscopy, and NMR measurements. The complex formation constants of the respective shells were estimated to be considerably different by a simulation analysis of ultraviolet–visible absorption spectra. The reversible assembly and release of iron into and out of the dendrimer were possible by electrochemical oxidation and reduction, respectively. DPA with a porphyrin at the core was found to function as an effective reduction catalyst of carbon dioxide. DPA with aryl amine at the core was demonstrated to function as a hole‐transporting material in electroluminescent devices. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 3719–3727, 2005

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Novel Hole‐Transport Material for Efficient Polymer Light‐Emitting Diodes by Photoreaction

Cited by 51 publications

References 41 publications

Solution‐Processed Bulk‐Heterojunction Solar Cells Based on Monodisperse Dendritic Oligothiophenes

Solution‐Processed Bulk‐Heterojunction Solar Cells Based on Monodisperse Dendritic Oligothiophenes

Synthesis and Characterization of Carbazole‐Based Dendrimers with Porphyrin Cores

Dendrimer complexes: Fine control of metal assembly in macromolecules

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