Title :
Surface modification of ITO anode by supercritical CO2/H2O2 treatment for organic light-emitting diodes
Author :
Tien, W.C. ; Chu, A.K. ; Lu, J.A. ; Chang, M.Y. ; Zheng, W.J. ; Chuang, M.J. ; Chao, C.M. ; Huang, W.Y.
Author_Institution :
Dept. of Photonics, Nat. Sun Yat-sen Univ., Kaohsiung, Taiwan
Abstract :
A simple method is proposed as an alternative to conventional oxygen plasma treatment to modify surface property of ITO anode of a fluorescent OLED. This was achieved by treating the ITO anode in supercritical CO2 (SCCO2) fluid with H2O2. The SCCO2/H2O2 treatments yielded an ITO work function of 5.35 eV after 15 min treatment at 85°C and 4000 psi, which was significant higher than 4.8 eV of the as-cleaned ITO surface. In addition, performance of OLEDs fabricated on the ITO anodes with and without the treatments was investigated. The maximum power efficiency of 1.94 lm/W was obtained at 17.3 mA/cm2 for the device with 15 min SCCO2/H2O2 treatment at 4000 psi. This power efficiency was 19.3% and 33.8% higher than those of the oxygen plasma treatment and as-clean, respectively.
Keywords :
anodes; indium compounds; organic light emitting diodes; semiconductor materials; surface treatment; tin compounds; work function; ITO; ITO anode; ITO surface; ITO work function; electron volt energy 5.35 eV; fluorescent organic light-emitting diode; maximum power efficiency; organic light-emitting diode performance; oxygen plasma treatment; pressure 4000 psi; supercritical carbon dioxide fluid; supercritical carbon dioxide-hydrogen peroxide treatment; surface modification; surface property; temperature 85 degC; time 15 min; Anodes; Indium tin oxide; Organic light emitting diodes; Plasmas; Surface contamination; Surface treatment; Temperature measurement;
Conference_Titel :
Active-Matrix Flatpanel Displays and Devices (AM-FPD), 2012 19th International Workshop on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-0399-6
