Prediction of OLED Luminance Using Impedance Measurements

Luminance is the main feature indicating organic light-emitting diode (OLED) degradation; however, this requires delicate photometric measurements that are difficult and costly to realize in situ . In this article, an original luminance decay prediction method not requiring optical measurements will...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2022-01, Vol.58 (1), p.996-1004
Main Authors: Al Haddad, Andrea, Picot, Antoine, Canale, Laurent, Dupuis, Pascal, Zissis, Georges, Maussion, Pascal
Format: Article
Language:English
Subjects:
Degradation
design of experiment (DoE)
Design of experiments
Electronics
Engineering Sciences
Equivalent circuits
Evolution
Impedance
Integrated circuit modeling
luminance
Optical measurement
Optics
organic light emitting diode (OLED)
Organic light emitting diodes
Photodegradation
Photonic
prediction
Stress
Temperature
Temperature measurement
Thermal stress
Time constant
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Summary:Luminance is the main feature indicating organic light-emitting diode (OLED) degradation; however, this requires delicate photometric measurements that are difficult and costly to realize in situ . In this article, an original luminance decay prediction method not requiring optical measurements will be presented. Analysis of the impedance revealed a strong correlation between the luminance and the time constant of the equivalent circuit. As a result, the time constant is chosen as the main feature to track OLED degradation, the evolution of which is linearly modeled over time at different stress levels using the design of experiments methodology. Simultaneously, a linear relationship between luminance degradation and the evolution of time constants, in terms of the thermal stress applied, enables prediction of the luminance degradation over time. This method is an accurate novel solution for luminance tracking in particular for data taken inside the experimental plan limits.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2021.3123096