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Nouvelles structures électroluminescentes organiques pour applications signalétiques et petits afficheurs

Abstract : OLED (Organic Light-Emitting Diode) technology has been exploited on an industrialscale for several years, principally in smartphones, TV displays, and similar devices. However, currentfabrication processes, such as thermal evaporation under high vacuum, are expensive and cannot beused for low-cost applications (signage, lighting, etc.). This work aims to develop high-performance,stable, low-cost OLEDs. Fabrication by solution processing was chosen to reduce the processing costsin any future commercialization of the work, while the inverted architecture was used to optimizedevice stability. In this work, ethoxylated polyethylenimine (PEIE) was used to reduce the workfunction of the transparent cathode. It was shown that higher performances could be obtained withinverted OLEDs compared to direct devices incorporating the same emissive polymer (Super Yellow).Furthermore, it was demonstrated that a binary blend, (PEIE and a hole blocking material) could bedeposited in a single step without reducing the OLED device’s performance – greatly simplifying thefabrication process. A TOF-SIMS (Time of Flight-Secondary Ion Mass Spectrometry) study wasconducted which demonstrated a vertical phase segregation of the binary blend. Finally, the indiumtinoxide (ITO) electrode, which represents at least 25% of the fabrication cost, was successfullyreplaced with a tin oxide (SnO2) layer, deposited by ALD (Atomic Layer Deposition).
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Submitted on : Monday, August 28, 2017 - 4:25:53 PM
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  • HAL Id : tel-01578102, version 1

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Yolande Murat. Nouvelles structures électroluminescentes organiques pour applications signalétiques et petits afficheurs. Electronique. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0585⟩. ⟨tel-01578102⟩

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