Title page for etd-0707114-211602


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URN etd-0707114-211602
Author Chun-Wen Chiu
Author's Email Address No Public.
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Department Electro-Optical Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Enhanced conductivity of PEDOT: PSS electrode by different treatment for ITO-free organic light emitting diodes
Date of Defense 2014-07-21
Page Count 95
Keyword
  • Organic light emitting diodes
  • PEDOT:PSS anode
  • Conductivity
  • Abstract Flexibility is one of the biggest features of OLED. However, there is a big problem brought by the ITO anode. ITO will crack when the substrate is bent in a large angle and this might result in decreasing the conductivity. Different treatments are used to enhance the conductivity of PEDOT:PSS thin film which can be an anode in organic light emitting diodes.
      In this research, the thin films of PEDOT:PSS with different treatments of H2SO4 and Glycerol were fabricated to replace the ITO layer as an anode to develop the flexible OLEDs. All different treated films were investigated and compared with each other in the difference of optical transmittance, work function, conductivity, surface roughness, surface morphology, and stability. It was found that after treatment the conductivity of PEDOT: PSS films can be effectively improved from 0.3 (S/cm) to 528 (S/cm) with H2SO4 treatment and from 0.3 (S/cm) to 588 (S/cm) with Glycerol treatment.
      Then The devices were fabricated by using the treated PEDOT:PSS thin film for an anode. The device structure is PEDOT:PSS(PH1000)(170 nm)/
    /NPB(50 nm)/Alq3(60 nm)/LiF(0.8 nm)/Al(200 nm),and the device area is 0.03 cm2.The result shows that Glycerol treated PEDOT:PSS anode has the better performance. It exhibits maximum luminance 387.7 cd/m2 .The maximum current and power efficiency are 1.29 cd/A and 0.81 lm/W. We expect it will replace ITO to develop flexible OLED.
    Advisory Committee
  • Wen-yao Huang - chair
  • Shun-Wei Liu - co-chair
  • Chih-Chien Lee - co-chair
  • Mei-Ying Chang - advisor
  • Files
  • etd-0707114-211602.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2014-08-07

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