The effects of sodium in ITO by pulsed laser deposition on organic light-emitting diodes |
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| Authors: | Thian-Khok Yong Yeh-Yee Kee Sek-Sean Tan Seong-Shan Yap Wee-Ong Siew Teck-Yong Tou |
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| Affiliation: | (1) Department of Physics, Gopal Krishna Gokhale College, Kolhapur, 416 012, MS, India;(2) Department of Materials Science and Engineering, Chonnam National University, 300 Yongbong-Dong, Puk-Gu, Gwangju, 500-757, South Korea;(3) Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur, 416004, MS, India |
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| Abstract: | The depth profile of ITO on glass was measured by the time-of-flight secondary ion mass spectroscopy (TOFSIMS) which revealed high sodium (Na) ion concentration at the ITO surface as well as at the ITO–glass interface as a result of out diffusion with substrate heating. Effects of Na ions on the performance of organic light-emitting diode (OLED) were studied by etching away a few tens of nanometers off the ITO surface with a dilute aquaregia solution of HNO3:HCl:H2O. A single-layer, molecularly doped ITO/(PVK+TPD+Alq3)/Al OLEDs were fabricated on bare and etched ITO samples. Although the removal of a 10-nm layer of ITO surface increased the voltage range, brightness, and lifetime, it was insufficient to correlate these improvements with solely to the Na ion reduction without considering the surface roughness. |
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