Cabrera-Mott process applied to OLED devices

Abstract

Organic light emitting devices (OLEDs) are often manufactured and studied where the common point of interest is the characteristic current-voltage curve. Apart from the usual electron-hole recombination, inadvertently introduced, or not, “external" ions can induce unexpected effects. Among them are the "primary processes”, where the first forward bias scan is systematically very different from all subsequent ones. This curve shows two current “bumps” that disappear on all subsequent scans. The first bump is already explained in terms of ionic currents. This paper describes a different model in terms of the Cabrera-Mott oxidation process.