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Etude du comportement électrique et photométrique des diodes électroluminescentes organiques pour l’éclairage ayant subi un vieillissement accéléré

Abstract : This work reports on the study of accelerated ageing of white organic light-emitting diodes (OLEDs) for lighting. We chose to apply our study on commercial products (Philips lumiblade GL55 and OSRAM Orbeos RMW-046) to eliminate the moisture, oxygen and manufacturing process effects on the degradation mechanisms. A preliminary bibliographic study enabled us to understand the operation mechanism of the OLEDs and to analyze the different degradation causes. This one also allowed us to determine the accelerated ageing test conditions (thermal and electrical stresses). In order, to apply these particular stress conditions, we designed and realized a specific and custom-made experimental ageing bench which allows us at the same time to apply these various ageing conditions and carry out electrical and optical measurement in situ. These measurements were realized before degradations and then until a loss of 50% of the luminous flow. The evolution of the electrical and optical characteristics of the OLEDs as well as the results obtained from some additional structural analysis enabled us to establish and understand the involved mechanisms.
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Alaa Alchaddoud. Etude du comportement électrique et photométrique des diodes électroluminescentes organiques pour l’éclairage ayant subi un vieillissement accéléré. Energie électrique. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30061⟩. ⟨tel-01888415⟩

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