Improved Performances for Organic Light-Emitting Diodes Based on Al2O3-Treated Indium?Tin Oxide Anode

Improved performances are obtained in organic light-emitting diodes (OLEDs) based on the indium–tin oxide (ITO) anode processed with ultrasonic in Al2O3 polishing solution. By optimizing the Al2O3 granularity to 0.6 μm and the ultrasonic time to 10 min, smoother ITO surfaces are acquired, which lead to the enhanced hole injection, and furthermore, to improving the performance of OLEDs. Compared with the control device without any treatment, the drive voltage of treatment device falls from 9 V to 6 V at 100 cd/m2, the luminance is over three times that of the control device, reaching 25880 cd/m2 at 15 V, and the luminous efficiency is 3.82 cd/A.