Photochemically induced emission tuning of conductive polumers used in OLEDs

• Published in: Journal of physics. Conference series Vol. 10; no. 1; pp. 285 - 288
• Main Authors: Vasilopoulou, M, Pistolis, G, Argitis, P
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.01.2005
• Subjects: Color; Conducting polymers; Electroluminescence; Emission analysis; Generators; Photolithography; Physics; Tuning
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/10/1/070

The present work focuses on the use of novel patterning technology schemes for the fabrication of OLED-based displays and in particular on the definition of two colour emitting pixels in one polymeric conducting layer. The approach adopted to this end is based on photochemically induced emition tuning. On the basis of this approach a novel photolithographic patterning technique was developed, aiming at the considerable simplification of the display fabrication process and on the performance improvement. We prepared electroluminescent devices that are emitting blue colour (λmax = 413 nm) with a turnon voltage about 12-15 V. In other devices we introduce a dispersed dye (1-[4-(dimethylamino)phenyl]-6-phenylhexatriene) and a series of photoacid generators (onium salts) in the polymeric layer and, by using an appropriate photochemical transformation through a photomask in a single layer, we were able to change the colour to desirable direction, since the parent compound and its photochemical product have distinguishable luminescence spectra (green and blue colour respectively). We were able to produce two of the three primary colours in a single layer of a conductive polymer by using a photochemical transformation based on photoacid induced emission change. A series of photoacid generators were evaluated.