Degradation induced decrease of the radiative quantum efficiency in organic light-emitting diodes

作者：Schmidt Tobias D^*; Setz Daniel S; Flaemmich Michael; Scholz Bert J; Jaeger Arndt; Diez Carola; Michaelis Dirk; Danz Norbert; Bruetting Wolfgang

来源：Applied Physics Letters, 2012, 101(10): 103301.

DOI：10.1063/1.4749815

The efficiency decrease during electrical operation of organic light-emitting diodes is a crucial issue for both applied and fundamental research. In order to investigate degradation processes, we have performed an efficiency analysis for phosphorescent state-of-the-art devices in the pristine state and after an accelerated aging process at high current density resulting in a luminance drop to less than 60% of the initial value. This loss in efficiency can be explained by a decrease of the radiative quantum efficiency of the light-emitting guest/host system from 70% to 40%, while other factors determining the efficiency are not affected.

• 出版日期2012-9-3