Stabilization of the work function of indium tin oxide using organic surface modifiers in organic light-emitting diodes

Sharma, Asha; Kippelen, Bernard; Hotchkiss, Peter J.; Marder, Seth R.
October 2008
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p163308
Academic Journal
We herein report on the performance and improved stability of organic light-emitting diodes (OLEDs) in which the transparent indium tin oxide (ITO) electrode is modified using organic surface modifiers based on phosphonic acid anchoring groups. In contrast to air plasma treatment, a commonly used technique to increase the work function of ITO, treatment of the ITO surface with a partially fluorinated phosphonic acid results in a comparable change in work function but with a higher stability over time. The resultant lifetime of OLEDs also increased when this phosphonic acid modified ITO was used.


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