2,7-Poly(9-fluorenone): A Trap-Free Electron-Injection Material with a High Charge Carrier Mobility for Use in Light-Emitting Diodes

Uckert, F.; Tak, Yoon Heung; Müllen, Kläus; Bäßler, H.

doi:10.1002/1521-4095(200006)12:12<905::aid-adma905>3.0.co;2-w

Cited by 115 publications

(63 citation statements)

References 3 publications

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“…It is well known that the stability of conducting polymers is critical for their application in electronic devices [45,46]. For that reason, the long-term stability upon cycling of these polymer films deposited on the Pt electrode was investigated by potential scanning between neutral and oxidized states in monomer-free H2O-HClO4 (1.0 M) solution ( [33], which indicates that salinization might be beneficial to the stability of conducting polymer.…”

Section: Electrochemistry Properties Of the Polymermentioning

confidence: 99%

Aqueous electrosynthesis of an electrochromic material based water-soluble EDOT-MeNH2 hydrochloride

et al. 2016

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. (2016). Aqueous electrosynthesis of an electrochromic material based water-soluble EDOT-MeNH2 hydrochloride. Synthetic Metals, 211 147-154. Aqueous electrosynthesis of an electrochromic material based watersoluble EDOT-MeNH2 hydrochlorideAbstract 2'-Aminomethyl-3,4-ethylenedioxythiophene (EDOT-MeNH2) showed unsatisfactory results when its polymerization occurred in organic solvent in our previous report. Therefore, a water-soluble EDOT derivative was designed by using hydrochloric modified EDOT-MeNH2 (EDOT-MeNH2·HCl) and electropolymerized in aqueous solution to form the corresponding polymer with excellent electrochromic properties. Moreover, the polymer was systematically explored, including electrochemical, optical properties and structure characterization. Cyclic voltammetry showed low oxidation potential of EDOT-MeNH2·HCl (0.85 V) in aqueous solution, leading to the facile electrodeposition of uniform the polymer film with outstanding electroactivity. Compared with poly(2′-aminomethyl-3,4-ethylenedioxythiophene) (PEDOTMeNH2), poly(2′-aminomethyl-3,4-ethylenedioxythiophene salt) (PEDOT-MeNH3 +A-) revealed higher efficiencies (156 cm2 C-1), lower bandgap (1.68 eV), and faster response time (1.4 s). Satisfactory results implied that salinization can not only change the polymerization system, but also adjust the optical absorption, thereby increase the electrochromic properties.

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Section: Electrochemistry Properties Of the Polymermentioning

confidence: 99%

Aqueous electrosynthesis of an electrochromic material based water-soluble EDOT-MeNH2 hydrochloride

et al. 2016

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“…This undesired long wavelength emission is observed in the PL [9] and the electroluminescence (EL) spectra, but it is typically more intense in the EL spectrum. [10,11] Although a number of possible mechanisms have been suggested, the origin of the longer wavelength band remains unclear. [1,10,12] In order to improve the performance and lifetime of PF based PLEDs, it is important to identify the origin of the long wavelength emission band and to understand the mechanism of the color degradation.…”

Section: Introductionmentioning

confidence: 99%

“…[10,11] Although a number of possible mechanisms have been suggested, the origin of the longer wavelength band remains unclear. [1,10,12] In order to improve the performance and lifetime of PF based PLEDs, it is important to identify the origin of the long wavelength emission band and to understand the mechanism of the color degradation. [1,13] Several attempts have been made to stabilize the blue color of PFs via chemical modification, including incorporation of benzothiadiazole, perylene, and anthracene moieties into the PF main chain and via end-capping, but the green EL was not completely eliminated.…”

Section: Introductionmentioning

confidence: 99%

Stabilized Blue Emission from Polyfluorene‐Based Light‐Emitting Diodes: Elimination of Fluorenone Defects

Gong¹,

Iyer²,

Moses³

et al. 2003

Adv Funct Materials

355

256

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Polyfluorene (PF)‐based light‐emitting diodes (LEDs) typically exhibit device degradation under operation with the emergence of a strong low‐energy emission band (at ∼ 2.2–2.4 eV). This longer wavelength band converts the desired blue emission to blue–green or even yellow. We have studied both the photoluminescence (PL) and electroluminescence (EL) of PFs with different molecular structures and found that the low‐energy emission band originates from fluorenone defects which are introduced by photo‐oxidization, thermal oxidation, or during device fabrication. X‐ray photo‐emission spectroscopy (XPS) results show that the oxidation of PF is strongly catalyzed by the presence of calcium. The fluorenone defects generate a stronger contribution to the EL than to the PL. By utilization of a novel electron‐transporting material as a buffer layer between the emissive PF and the Ca/Ag (Ba/Ag) cathode, the blue EL emission from the PF was stabilized.

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“…containing copolymers might present improved electronic transport properties, as has been shown in light-emitting diode (LEDs). [19] For the above reasons, they seem to be good candidates for applications in plastic solar cells. Furthermore, they exhibit extended absorption bands covering a large range of the visible part of the spectrum.…”

Section: Introductionmentioning

confidence: 99%

Plastic Solar Cells Based on Fluorenone-Containing Oligomers and Regioregular Alternate Copolymers

et al. 2005

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2,7-Poly(9-fluorenone): A Trap-Free Electron-Injection Material with a High Charge Carrier Mobility for Use in Light-Emitting Diodes

Cited by 115 publications

References 3 publications

Aqueous electrosynthesis of an electrochromic material based water-soluble EDOT-MeNH2 hydrochloride

Aqueous electrosynthesis of an electrochromic material based water-soluble EDOT-MeNH2 hydrochloride

Stabilized Blue Emission from Polyfluorene‐Based Light‐Emitting Diodes: Elimination of Fluorenone Defects

Plastic Solar Cells Based on Fluorenone-Containing Oligomers and Regioregular Alternate Copolymers

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