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Can still work after bending or stretching freely
Structure and main performance parameters of organic EL light source film
Professor Toshio Takashi, a professor of engineering at the University of Tokyo, has developed a thin-film organic EL light source that can work normally even when bent freely. The thin film organic EL light source developed has a minimum radius of curvature of 10 μm and a luminance of 100 cd/m 2 . Sugani et al. hopes to use it as a new light source for medical and health sensors.
Sugoku et al. just released on July 25 a thin-film pressure sensor that could work normally and be gentler than feathers. In the development of this sensor, the researchers successfully formed an electronic TFT-array of organic TFTs on a thin film substrate. Moreover, Sericulture et al. also developed the same light and thin organic solar cell in 2011.
With the development of this thin-film organic EL light source, all the elements required for medical and health sensors such as organic TFTs, optical sensors, and light-emitting devices are all available, and it is expected to be integrated into an ultra-thin film. In the measurement of human body information such as blood oxygen concentration, a device that combines a light source and a photodetector is commonly used. Therefore, Sikgu et al. hope that this organic EL light source can be used to measure various human body information using light as a probe. For wearables for medical and health purposes.
The weight per unit area of ​​the organic EL light source film developed this time is the same as that of the film sensor released on July 25, only 3g/m2. Moreover, the thickness is only 2 μm and it is flexible and flexible. The University of Tokyo established a unique technique for directly stacking organic EL elements on a plastic film substrate with a thickness of only 1.4 μm to form a light and soft organic EL light source.
The decisive role for this development is the improvement of the manufacturing technology and constituent materials of organic EL devices. The plastic film substrate is easily damaged during the manufacturing process. In order to form an organic EL element directly thereon, the researchers did not use ITO which requires a high-energy film forming process (using plasma) as an electrode, but used a low temperature. A low-energy, spin-coated conductive polymer (PEDOT:PSS) is used as an electrode (anode). PEDOT:PSS has been used as a material for the hole injection layer before, and this time the researchers discovered that it can also be used as an anode in light-emitting organic EL elements.
In addition, the study was jointly promoted by the researchers of Siegfried Bauer and Niyaze Serdar Sariciftci of the Johannes Kepler University of Linz in Austria. The paper introducing the research results was published in the online version of the "Nature Photonics" academic magazine on July 28, 2013 (UK time). (Reporter: Naoki Tanaka, Nikkei Electronics)
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