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The molybdenum oxide (MoO 3 ) thin layers are used as the hole injection layer in the organic light emitting diodes (OLEDs). The surface treatment of MoO 3 with ultraviolet ozone (UVO), nitrogen (N 2 ) and argon (Ar) gas plasma have been studied. The turn on voltage is lowered in UVO treated device whereas for plasma treated device the turn on voltage increases. The surface...