A novel approach has been started to develop high efficient small molecule OLED stack deposition on flexible webs in a roll-to-roll process as a major cost reducing step. Low cost metal foil as a substrate for the OLED devices will allow significant cost reduction, will open up new degrees of freedom in system design and will be competitive for general signage and lighting applications. Metal foils as a substrate for the deposition of organic light-emitting diodes with the doped charge transport layers, the so called p-i-n OLED technology, will allow a direct OLED deposition on the substrate with low operating voltage. Within the "Center of Organic Materials and Electronic Devices Dresden" (COMEDD) of Fraunhofer IPMS a roll-to-roll line for research and development for OLED lighting has been brought into operation. The roll-to-roll line consists of a vacuum coater for small molecule depositions, a roll-to-roll encapsulation unit under inert atmosphere and an optical inspection system for defect analysis. In this paper the roll-to-roll OLED fabrication concepts will be highlighted. Additionally, the first results of roll-to-roll defect monitoring concepts to support the roll-to-roll line will be outlined. The defect prevention is essential for the device performance to avoid electrical shorts and reduced luminous efficacy.
Roll-to-Roll process concepts for general OLED lighting
2012
4 Seiten, 11 Bilder, 7 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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