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Organic EL light source that is free to bend and will not be damaged
In a recent breakthrough, researchers from the University of Tokyo have developed a flexible organic EL (Electroluminescent) light source that can bend and stretch without losing functionality. This innovative technology is set to revolutionize the field of medical sensors and wearable devices. The thin-film organic EL light source can operate even when bent with a minimum radius of curvature as small as 10 micrometers, achieving a luminance of 100 cd/m².
This development opens up new possibilities for integrating optical components into ultra-thin, flexible systems. For instance, the light source could be used in conjunction with photodetectors to measure vital signs such as blood oxygen levels. The device’s lightweight design—only 3 grams per square meter—and its ultra-thin structure (just 2 micrometers thick) make it ideal for use in wearable health monitoring systems.
The key to this achievement lies in the advanced manufacturing techniques and materials used. Unlike traditional methods that rely on ITO (indium tin oxide), which requires high-energy processes like plasma deposition, the team employed a low-temperature, spin-coated conductive polymer called PEDOT:PSS as an anode. This material not only simplifies the fabrication process but also enhances the flexibility and durability of the device.
The research was conducted in collaboration with scientists from Johannes Kepler University of Linz in Austria, including Siegfried Bauer and Niyaze Serdar Sariciftci. Their findings were published in the online edition of *Nature Photonics* on July 28, 2013.
This innovation marks a significant step forward in the development of next-generation flexible electronics, paving the way for more comfortable, efficient, and versatile medical and health-monitoring technologies.