Raman spectral changes of PEDOT-PSS in polymer light-emitting diodes upon operation

Satoshi Sakamoto, Masanori Okumura, Zinggang Zhao, Yukio Furukawa

    Research output: Contribution to journalArticle

    75 Citations (Scopus)

    Abstract

    The micro-Raman spectra of a double-layer light-emitting diode fabricated with poly(3,4-ethylenedioxythiophene)-poly(4-styrenesulfonate) (PEDOT-PSS) as a hole-injection layer and poly(2,7-(9,9-dioctylfluorene)-alt-benzothiadiazole) (F8BT) blended with poly(9,9-dioctylfluorene) (PF8) as an emissive layer have been measured with excitation at 633 nm. After the operation of the device, the intensities of the bands due to PEDOT have increased. These increases in Raman intensity have been attributed to the reduction (dedoping) of PEDOT chains during operation on the basis of the results of electrochemical oxidation and reduction of a PEDOT-PSS film. The reduction of PEDOT chains is most likely one of the intrinsic factors of the degradation of polymer light-emitting diodes.

    Original languageEnglish
    Pages (from-to)395-398
    Number of pages4
    JournalChemical Physics Letters
    Volume412
    Issue number4-6
    DOIs
    Publication statusPublished - 2005 Sep 5

    Fingerprint

    Light emitting diodes
    Polymers
    light emitting diodes
    polymers
    Intrinsic Factor
    electrochemical oxidation
    Electrochemical oxidation
    Raman scattering
    Raman spectra
    injection
    degradation
    Degradation
    excitation
    poly(3,4-ethylene dioxythiophene)
    benzo-1,2,3-thiadiazole

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Spectroscopy
    • Atomic and Molecular Physics, and Optics
    • Surfaces and Interfaces
    • Condensed Matter Physics

    Cite this

    Raman spectral changes of PEDOT-PSS in polymer light-emitting diodes upon operation. / Sakamoto, Satoshi; Okumura, Masanori; Zhao, Zinggang; Furukawa, Yukio.

    In: Chemical Physics Letters, Vol. 412, No. 4-6, 05.09.2005, p. 395-398.

    Research output: Contribution to journalArticle

    Sakamoto, Satoshi ; Okumura, Masanori ; Zhao, Zinggang ; Furukawa, Yukio. / Raman spectral changes of PEDOT-PSS in polymer light-emitting diodes upon operation. In: Chemical Physics Letters. 2005 ; Vol. 412, No. 4-6. pp. 395-398.
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    abstract = "The micro-Raman spectra of a double-layer light-emitting diode fabricated with poly(3,4-ethylenedioxythiophene)-poly(4-styrenesulfonate) (PEDOT-PSS) as a hole-injection layer and poly(2,7-(9,9-dioctylfluorene)-alt-benzothiadiazole) (F8BT) blended with poly(9,9-dioctylfluorene) (PF8) as an emissive layer have been measured with excitation at 633 nm. After the operation of the device, the intensities of the bands due to PEDOT have increased. These increases in Raman intensity have been attributed to the reduction (dedoping) of PEDOT chains during operation on the basis of the results of electrochemical oxidation and reduction of a PEDOT-PSS film. The reduction of PEDOT chains is most likely one of the intrinsic factors of the degradation of polymer light-emitting diodes.",
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