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

Satoshi Sakamoto; Masanori Okumura; Zinggang Zhao; Yukio Furukawa

doi:10.1016/j.cplett.2005.07.040

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

Satoshi Sakamoto, Masanori Okumura, Zinggang Zhao, Yukio Furukawa

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83 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 language	English
Pages (from-to)	395-398
Number of pages	4
Journal	Chemical Physics Letters
Volume	412
Issue number	4-6
DOIs	https://doi.org/10.1016/j.cplett.2005.07.040
Publication status	Published - 2005 Sep 5

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ASJC Scopus subject areas

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

Cite this

Sakamoto, S., Okumura, M., Zhao, Z., & Furukawa, Y. (2005). Raman spectral changes of PEDOT-PSS in polymer light-emitting diodes upon operation. Chemical Physics Letters, 412(4-6), 395-398. https://doi.org/10.1016/j.cplett.2005.07.040

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title = "Raman spectral changes of PEDOT-PSS in polymer light-emitting diodes upon operation",

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.",

author = "Satoshi Sakamoto and Masanori Okumura and Zinggang Zhao and Yukio Furukawa",

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AU - Sakamoto, Satoshi

AU - Okumura, Masanori

AU - Zhao, Zinggang

AU - Furukawa, Yukio

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N2 - 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.

AB - 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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Access to Document

10.1016/j.cplett.2005.07.040