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Influence of temperature and drive current on degradation mechanisms in organic light-emitting diodes

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2 Author(s)
Ishii, Masahiko ; Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi 480-1192, Japan ; Taga, Yasunori

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We measured luminance decay and half life for green organic light-emitting diodes composed of materials with high glass transition temperature. The devices were driven at dc, constant current density ranging from 3.8 to 130 mA/cm2 at 25, 85, and 120 °C. The shapes of the luminance decay curves were compared by redrawing the curves on a time scale normalized by each half life. Temperature and drive current shortened the half life. However, the normalized decay curve of the device driven at 120 °C had the same shape as that of the device driven at 25 °C. Drive current also left the shape of the decay curves unchanged. Therefore, we conclude that the temperature and drive current do not change the relative contribution of multiple degradation mechanisms. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:80 ,  Issue: 18 )