Dramatically improved lifetime operation and luminous efficiency for flexible organic light-emitting devices by oxygen plasma and nitrogen treatments

Experimental results show that the turn-on and driving voltages are reduced from 7.7 to 0.3 V and 8 to 5 V respectively, with both O₂ plasma and N₂ treatments, thus extending the developed organic light-emitting device (OLED) lifetime. The current efficiency (γ) and the power efficiency (η), and thus in turn the output luminance of OLEDs treated by both treatments, are improved about sixfold and tenfold, respectively, under the 2.78 mA/cm² driving current.