The efficiency of multi‐layer OLEDs using indium tin oxide (ITO) and triphenyldiamine is limited by the hole injection rate, or the quality of the contact between the two components, respectively. Coating the ITO with an ultra‐thin Pt layer dramatically improves hole injection, and significantly lowers the devices' operating voltage. The Figure juxtaposes AFM images of an unmodified (left) and Pt‐coated ITO electrode (right).
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