The effects of polymer-insulating nanolayers on electron injection in the polymer light-emitting diodes (PLED) were investigated. Three kinds of polymer thin films that were capable of electron tunneling and were of different dielectric constants were placed to investigate their influence on the device performance. Higher luminescence quantum efficiency was demonstrated by the device with a nanolayer of lower dielectric constant. The results show that on employing a ∼10-nm-thick polystyrene layer the device gave approximately two orders of magnitude higher external quantum efficiency than that without an insulating nanolayer.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)