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Mitsubishi Chemical & Pioneer to Develop OLED Lighting Using the Wet Coating Process

Published on 2012-06-05. Author : SpecialChem

Mitsubishi Chemical Corporation and Pioneer Corporation announce that they have successfully developed organic light emitting diode (OLED) elements using wet coating process for the light-emitting layers, and have agreed to set up a testing facility with an eye to establishing mass production technology.

Most OLED panels are currently manufactured using a film forming process called "vapor deposition". They have complex structures that require multiple light-emitting layers (multi-unit structure) to increase their light-emitting performance.

The best way to inexpensively mass-produce panels with large surface areas and uniform light-emitting surfaces with as few imperfections as possible however is to manufacture panels using a process known simply as "wet coating".

In particular, there is growing demand to use the wet coating process to manufacture light-emitting layers from high-end materials, in order to significantly improve the performance of OLED lighting panels. With existing technology however, it isn't possible to achieve the necessary lifetime or luminescent efficiency for use in lighting.

Working with Mitsubishi Chemical and its research and development subsidiary Mitsubishi Chemical Group Science and Technology Research Center, Inc., in January 2010 Pioneer began a joint project to develop OLED lighting panels with a simple single-unit structure using the wet coating process.

The OLED device (both white and full-color versions) developed as a result of this project have a long enough lifetime and are efficient enough to make them commercially viable for use in lighting. This has been achieved by combining unique light-emitting materials with a wet coating process developed by Mitsubishi Chemical and by optimizing device structure and the wet coating process on a joint basis between both companies.

Assuming a lifetime of 70% with a white luminance of 1,000 cd/m2, the white elements provide a lifetime of 57,000 hours. In terms of luminescent efficiency too, the high-efficiency full-color device achieve levels of 56 lm/W at 2,000 cd/m2.

Based on these results, Mitsubishi Chemical and Pioneer have agreed to set up a testing facility with an eye to establishing mass production technology for OLED lighting panels, using the wet coating process to produce single-unit light-emitting layers.

The facility will be able to produce and evaluate the performance of prototype OLED lighting panels using the wet coating process on G1 glass substrates (40 cm x 30 cm). The aim is to develop and test mass production technology.

The testing facility will be set up at the Yonezawa Plant operated by Pioneer's wholly owned subsidiary Tohoku Pioneer Corporation and is scheduled to be up and running by summer 2012. (The facility will be partially funded by a Subsidy for Advanced Technology Demonstration and Evaluation Facility Development, part of the Ministry of Economy, Trade and Industry's Innovation Center Establishment Assistance Program.)

Mitsubishi Chemical and Pioneer are aiming to establish mass production technology as soon as possible, with an eye to commencing full-scale production of OLED lighting by fiscal 2014.

About Pioneer

Pioneer's group companies all share the common approach of putting people and society first. Each Group company is fulfilling its duties as a team of highly skilled professionals in R&D, production, sales, or other operations by realizing outstanding collective capabilities. Based on the themes of "to be customerfocused," "to develop professionalism" and "to pursue innovations," the Pioneer Group will further strengthen cooperation on the global stage, while creating outstanding products and services and fostering a strong corporate culture.

About Mitsubishi Group

Mitsubishi Chemical Holdings Corporation (MCHC) was jointly established by Mitsubishi Chemical Corporation and Mitsubishi Pharma Corporation (Current Mitsubishi Tanabe Pharma Corporation) with a stock-for-stock exchange effective in October 2005. Then, Mitsubishi Tanabe Pharma Corporation, formed by the merger between Mitsubishi Pharma Corporation and Tanabe Seiyaku Co., Ltd. began operation on October 1, 2007. Subsequently, the functional products businesses of the MCHC Group were restructured and consolidated as a new company, Mitsubishi Plastics, Inc., on April 1, 2008. Further, Mitsubishi Rayon Co., Ltd. joined the MCHC Group on April 1, 2010. Thus the MCHC Group currently consists of four core business companies: Mitsubishi Chemical Corporation, Mitsubishi Tanabe Pharma Corporation, Mitsubishi Plastics, Inc., and Mitsubishi Rayon, Co., Ltd., and their group companies. As the holding company, MCHC will further develop and enhance its Group portfolio so as to increase overall Group value.

Source: Pioneer


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