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| December 2005 |
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Mitsuru Tanamura
Project Leader
Optoelectronic Materials Laboratory
Mitsubishi Chemical Group Science and Technology Research Center, Inc. |
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The Mitsubishi Chemical Group is working on developing materials for Organic Light-Emitting Diode (OLED) displays. These materials are expected to take up the next generation of flat panel displays. The development is based on elemental technologies like dye synthesis, thin film formation, and interface analysis. It has been focused on developing a blue phosphorescent OLED material, which is considered to be the most difficult of these technologies to put into practical use. We have recently succeeded in fabrication of a wet-coating type OLED device with the high efficiency using our new blue phosphorescence OLED material. We will continue our research and development efforts toward improving the product lifetime and putting it into practical use early on.
Currently practical flat panel displays include liquid crystal and plasma displays. Compared to those displays already on the market, OLED displays are said to be producible with even greater thinness, lower weight, and lower power consumption. They also feature 1000 times faster response rates than that of liquid crystal displays, which are ideal for superior video performance. OLED displays show promise as flexible large-screen displays because the material is made of light emitting elements using organic materials.
While research and development is being carried out all over the world on OLED displays, the major obstacles to putting the displays into practical use are their low luminous efficiency and short lifetime. To overcome these challenges, it is very important to optimize the OLED device structure and to improve the quality of the OLED material. The Mitsubishi Chemical Group has been working around to overcome the challenges presented by OLED devices, utilizing to the fullest the knowledge it has accumulated over many years in dyestuff and charge transport materials.
One of the distinctive OLED materials the Mitsubishi Chemical Group has developed is our wet-coating type hole injection material (PC series). The use of the PC series allows for the OLED material to be made more energy efficient through lower voltages, with improved yield owing to short circuit suppression. In December 2005, we also succeeded in developing a wet-coating type OLED device with the high efficiency using our new blue phosphorescence OLED material. We consider these to be the great results of the coming together of our material synthesis and device manufacturing technologies.
In the future, we will be focusing on extending the lifetime of blue elements OLED devices, while also engaging in development of green and red OLED materials. We invite you to expect further research progress in the Mitsubishi Chemical Group organic electroluminescent materials. |
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