The authors have investigated the effects of indium tin oxide (ITO) deposited by ion beam assisted e-beam evaporation on the performance of polymer light-emitting diodes. ITO was evaporated as a cathode onto a thin Mg:Ag layer by an e-beam process, and its performance as a transparent cathode was subsequently compared to that of Mg:Ag and sputtering-prepared ITO. Polymer devices' luminance and efficiency were improved by more than ten times by ion beam assisted deposition (IBAD)-prepared ITO deposition, with little observable damage to the organic layer. Implementation of the IBAD process resulted in the reduction of the interfacial energy barrier which induced band bending. Furthermore, outcoupling with ITO resulted in enhanced luminance.
Bibliographical noteFunding Information:
The authors offer special thanks to Jun Yeob Lee from Dankook University and Jang Hyuk Kwon of Kyunghee University for their valuable advice. This work was supported by the Brain Korea 21(BK21) fellowship program at Korea’s Ministry of Education.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)