Overshoot effect in transient electroluminescence from single layer organic light-emitting diodes

The overshoot effect in transient electro luminescence (EL) is attributed to an accumulation and trapping of holes at the polymer/metal interface and this effect is enhanced at large reverse bias. The roughness of the Al(sub 2)O(sub 3) has an important bearing on the electron-hole recombination near the interface and its useful manifestation is the appearance of a large EL-spike upon reversing the driving voltage.