Abstract
The aim of this paper is to identify the photometric, radiometric, and colorimetric signatures of degradations of large area white organic light emitting diodes (Philips GL55, 41cm2 active area), subjected to various stress conditions. Nine devices have been stressed at a constant current density of 11.25mA/cm2, 13mA/cm2 and 15mA/cm2 at 23°C (room temperature), 40°C and 60°C. We have also stocked three devices under purely thermal stress at the same temperatures. Thus, we can make comparison between electrical-thermal stress and purely thermal stress. Over aging time, an increase of both the correlated color temperature and the general rendering index was observed. The degradation rate of the blue emitter is more significant than the other emitters, which induced a color shift toward a green-yellow.
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