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Nanoscale Thickness and Roughness Control of Gravure Printed MEH-PPV Layer by Solvent Printing for Organic Light Emitting Diode

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In this work, a nanoscale thick organic light emitting MEH-PPV (poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]layer) was realized by gravure printing technology and its roughness was controlled by the solvent printing process. Also, an organic light emitting diode (OLED) was successfully fabricated by the gravure printing of MEH-PPV layers with surface treatments of solvent printing. There is strong demand for high throughput and large area processing technology for the commercialization of OLEDs and the gravure printing process is a good candidate. We applied gravure printing process technology to OLED fabrication in this work. We controlled the thickness of the organic layers by the multi-printing technique. To control the roughness of the MEH-PPV organic layer, solvent printing was proposed in this work with various solvent mixture of chloroform, chlorobenzene and 1,2-dichlorobenzene on the top of the gravure printed MEH-PPV layers and a significant reduction in roughness was achieved. We were able to achieve a 51 nm thick and 3.7 nm rough MEH-PPV layer with the gravure printing process and subsequent solvent printing treatment and an OLED was fabricated using the gravure printed organic layers. An improvement of the brightness and efficiency was observed due to the improved roughness of the organic layers.


Document Type: Research Article


Publication date: May 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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