This work aims at explaining and predicting the influence of dye doping and space charge effects on charge carrier transport at different operating temperatures. For that purpose, currentvoltage J-V characteristics for typical electrically-doped multilayer OLEDs have been simulated. The results are in good agreement with experiment.

Abstract— This work aims at explaining and predicting the influence of the thickness of organic materials, dye doping, and space‐charge effects on charge‐carrier transport at different operating temperatures for high current densities (50 ≤ J ≤ 7000 mA/cm2). For the purpose of determining these influences, current‐voltage characteristics for typical electrically doped multilayer organic light‐emitting diodes (OLEDs) have been simulated. The results of the simulations concur with experimental data.

Innovative PIN OLED that use a new n‐doped architecture have been investigated. Good initial performances as well as good lifetimes have been demonstrated. Thermal stability of these new diodes has been greatly improved by using a new system matrix+ n‐dopant. As a result, RGB diodes can sustain at least a 500 h storage period‐of‐time at 90 °C with minor degradation. Preliminary studies at 110 °C for at least 24 h show also very promising features for such devices.

In the present work, a particular emphasis is put on the stability of the OLED devices obtained as well as on their ability to keep their good initial performances even in a severe environment. Moreover, the operation voltage of these devices turns out to be rather low.

Highly efficient small molecule-based organic light-emitting devices (OLED) that use electrically doped charge injection layers are presented. These structures exhibit low power consumption, long lifetime and high stability when operated at ambient temperature. It is also shown that their performances do not change significantly even when devices are stored at 90 C for 80 days or 110 C for 24 h. Such OLED structures thus fulfill the most severe requirements for mobile display applications.