Performance analysis of layered and blended organic light-emitting diodes

We make performance analysis of three different organic light-emitting diodes (OLEDs), one of which is based on a conventional layered structure and the others on a blended structure where an emitting layer (EML) is either uniformly or stepwise mixed with an electron transport layer (ETL), Tris-(8-hydroxyquinoline) aluminum (Alq
₃
). It is shown that the blended configuration suppresses penetration of positive charges into the ETL or rather oxidative degradation of Alq
₃
molecules through the delocalization of electron-hole recombination, the longevity of OLEDs by which is expected to be enhanced.