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Film properties and polycrystallization of organic dyes on ITOs with surface treatment for organic light‐emitting diodes
Author(s) -
Iwama Yuki,
Mori Tatsuo,
Mizutani Teruyoshi
Publication year - 2006
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20379
Subject(s) - oled , materials science , anode , optoelectronics , layer (electronics) , degradation (telecommunications) , deposition (geology) , diode , surface energy , nanotechnology , composite material , chemistry , electrode , computer science , telecommunications , paleontology , sediment , biology
ITO (indiuTatsuooxide) has now been widely used as the transparent anode for organic light‐emitting devices (OLEDs). We used various methods of ITO surface treatment and examined their effects by measuring contact angle and calculating surface energy. We also prepared OLEDs with ITO treated by each method, and estimated their characteristics. The surface of ITO treated by UV‐O 3 or O 2 ‐plasma was more hydrophilic than that treated by only organic rinse or no treatment, and consequently the characteristic of the OLED was improved. We suppose these treatments affect the hole injection from ITO into the organic layer, due to ionization potential or surface cleanness. We also investigated the time degradation of NPD films on the ITO substrates. The films deposited with a high deposition rate polycrystallized faster. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 156(4): 1– 8, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20379