TITLE

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

AUTHOR(S)
Ishii, Masahiko; Taga, Yasunori
PUB. DATE
May 2002
SOURCE
Applied Physics Letters;5/6/2002, Vol. 80 Issue 18, p3430
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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/cmsup2; 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.
ACCESSION #
6579207

 

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