Efficiency enhancement of organic light emitting diodes by NaOH surface treatment of the ITO anode
- Authors: Cusumano, P
- Publication year: 2009
- Type: Articolo in rivista (Articolo in rivista)
- Key words: Organic light emitting diodes (OLEDs); Efficiency; ITO surface treatments; Work function modification; Device fabrication techniques;
- OA Link: http://hdl.handle.net/10447/37348
Abstract
Organic light emitting diodes (OLEDs) based on tris-(8-idroxyquinoline)aluminum (Alq3) with enhanced efficiency are reported here. This is obtained by improving the charge carrier balance, through a preliminary NaOH surface treatment of the indium tin oxide (ITO) anode, in order to decrease its work function and, consequently, reduce the hole injection. The obtained devices exhibit a 1.36% external quantum efficiency and a 1.2 lm/W power efficiency at a current density of 60 mA/cm2. These values are more than double as compared with those of identical reference devices fabricated without the preliminary NaOH surface treatment.