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The authors report the enhancement of hole injection using an indium tin oxide ͑ITO͒ anode covered with ultraviolet ͑UV͒ ozone-treated Ag nanodots for fac tris ͑2-phenylpyridine͒ iridium Ir͑ppy͒ 3-doped phosphorescent organic light-emitting diodes ͑OLEDs͒. X-ray photoelectron spectroscopy and UV-visible spectrometer analysis exhibit that UV-ozone treatment of the Ag nanodots dispersed on the ITO anode leads to formation of Ag 2 O nanodots with high work function and high transparency. Phosphorescent OLEDs fabricated on the Ag 2 O nanodot-dispersed ITO anode showed a lower turn-on voltage and higher luminescence than those of OLEDs prepared with a commercial ITO anode. It was thought that, as Ag nanodots changed to Ag 2 O nanodots by UV-ozone treatment, the decrease of the energy barrier height led to the enhancement of hole injection in the phosphorescent OLEDs.

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