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Issue 24, 2006
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Synthesis of novel triphenylamine-based conjugated polyelectrolytes and their application as hole-transport layers in polymeric light-emitting diodes

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Abstract

Alternating triphenylamine-based copolymers poly[N-(4-sulfonatobutyloxyphenyl)-4,4′-diphenylamine-alt-1,4-phenylene] sodium salt (PTPOBS) and poly[N-(4-sulfonatophenyl)-4,4′-diphenylamine-alt-N-(p-trifluoromethyl)phenyl-4,4′-diphenylamine] sodium salt (PTFTS) were synthesized via palladium-catalyzed Suzuki coupling reaction. These polymers are soluble only in polar solvents, such as dimethyl sulfoxide (DMSO) and a mixed solvent of methanol and N,N-dimethyl formamide (DMF), rather than in non-polar solvents such as toluene and xylene. The electrochemical and photophysical properties of the resulted copolymers were investigated. The HOMO levels of the polymers (−5.08 eV for PTPOBS and −5.24 eV for PTFTS) were close to the work function of PEDOT. The relatively high-lying LUMO levels (−2.21 eV for PTPOBS and −2.24 eV for PTFTS) revealed that they had good electron-blocking capabilities. Devices with a PTPOBS or PTFTS layer inserted between ITO or PEDOT and of red and green-emitting polymers showed lower turn-on voltages and enhanced efficiency compared with the reference devices composed of bare ITO or ITO/PEDOT as anode. These polymers can be used as an independent hole-transport/electron-blocking layer or in combination with a PEDOT layer for fabrication of multilayer devices without intermixing with the subsequent EL layer by solution processing in full-color display applications.

Graphical abstract: Synthesis of novel triphenylamine-based conjugated polyelectrolytes and their application as hole-transport layers in polymeric light-emitting diodes

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Publication details

The article was received on 13 Mar 2006, accepted on 11 Apr 2006 and first published on 05 May 2006


Article type: Paper
DOI: 10.1039/B603704F
Citation: J. Mater. Chem., 2006,16, 2387-2394
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    Synthesis of novel triphenylamine-based conjugated polyelectrolytes and their application as hole-transport layers in polymeric light-emitting diodes

    W. Shi, S. Fan, F. Huang, W. Yang, R. Liu and Y. Cao, J. Mater. Chem., 2006, 16, 2387
    DOI: 10.1039/B603704F

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