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 AlAl₂O₃ polishing solution. By optimizing the AlAl₂O₃ granularity to 0.6μm and the ultrasonic time to 10min, 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 9V to 6V at 100cd/m², the luminance is over three times that of the control device, reaching 25880cd/m² at 15V, and the luminous efficiency is 3.82cd/A.