TY - JOUR
T1 - Raman spectral changes of PEDOT-PSS in polymer light-emitting diodes upon operation
AU - Sakamoto, Satoshi
AU - Okumura, Masanori
AU - Zhao, Zinggang
AU - Furukawa, Yukio
N1 - Funding Information:
The sample of F8BT and PF8 was provided from Dr. Toshihiro Ohnishi of Sumitomo Chemical Co. Ltd. PEDOT–PSS samples (CH8000 and AI4083) were provided from Bayer. This work was supported in part by the 21COE ‘Practical Nano-Chemistry’ and the Grant-in-Aid for Scientific Research (A) (No. 16205004) from the Ministry of Education, Culture, Sports, Science and Technology.
PY - 2005/9/5
Y1 - 2005/9/5
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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U2 - 10.1016/j.cplett.2005.07.040
DO - 10.1016/j.cplett.2005.07.040
M3 - Article
AN - SCOPUS:23944469840
VL - 412
SP - 395
EP - 398
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 4-6
ER -