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|Type of Document
||Enhanced conductivity of PEDOT: PSS electrode by different treatment for ITO-free organic light emitting diodes|
|Date of Defense
||Organic light emitting diodes
||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.
||Wen-yao Huang - chair|
Shun-Wei Liu - co-chair
Chih-Chien Lee - co-chair
Mei-Ying Chang - advisor
Indicate in-campus at 5 year and off-campus access at 5 year.|
|Date of Submission