Degradation Of The Luminance And Impedance Evolution Analysis Of An Oled Under Thermal And Electrical Stress

Organic light emitting diodes are one of the most innovative light sources. They do not require semiconductor fabrication techniques like the LED family, they are simple to construct and are used in many original applications. The inconvenient of this product is that it does not have a long lasting useful life with more then 10000 hours. Therefore, this paper will present a parametric method to design an aging model of the OLED, based on luminance decay and electrical impedance evolution. Accelerated tests using thermal factor and current will be applied to large warm white OLED panels. A Gaussian model for the luminance decay and a linear model for the impedance characteristics will be merged with design of experiments method to include the stress factors, resulting in an effective degradation model that can estimate the lifetime of the OLED.