| Summary: | 碩士 === 國立中山大學 === 光電工程學系研究所 === 102 === The aim of this dissertation was to investigate the aging of indium tin oxide (ITO) anodes of organic light-emitting diodes (OLED) treated by supercritical CO2 (SCCO2) with H2O2. By SCCO2/H2O2 4000psi-15min treatment, the work function as high as 5.3eV was achieved, which was higher than 5.2eV of the O2 plasma treated sample and 4.8eV of the as-cleaned sample. Furthermore, surface energy and polar component of as-cleaned ITO anode were 46.6 mJ/m2 and 16 mJ/m2. After treating SCCO2/H2O2 fluid, the surface energy and polar component were significantly increased to 80.2 mJ/m2 and 38.5 mJ/m2.
However, after 96 hours aging in air, the surface energy and polar component of the SCCO2/H2O2 treated ITO anode reduced slightly to 72.6 mJ/m2 and 38.3 mJ/m2. On the other hand, the surface energy and polar component of conventional O2 plasma treated ITO anode decreased drastically to 62.3 mJ/m2 and 28.9 mJ/m2. In addition to the aging of OLED, the device of the 6 hours-aging in air sample were similar for the sample treated by SCCO2/H2O2 4000psi-15min and O2 plasma. The luminance over 40000 cd/m2 was achieved from both of the two samples. After 12 hours aging in air, the OLEDs characteristics of the SCCO2/H2O2 treated samples were better than the O2 plasma treated sample.
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