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Pen writing with LEDs

15.08.2023

A team of engineers from Washington University in St. Louis has unveiled an innovative concept that allows flexible LED structures to be applied using a conventional ink pen or inkjet printer.

This is achieved thanks to new inks designed specifically for this purpose. These inks contain advanced polymers, metal nanowires and perovskites, crystalline materials capable of emitting a wide range of colors. The principle is simple: an ink pen is filled with these special substances, and with their help you can "draw" flexible light-emitting diodes (LED) or photodetectors on various surfaces.

The application of this technology makes it possible to create a variety of functional devices, including biomedical sensors and disposable electronics, by simply drawing ink lines layer by layer. The main advantage lies in the versatility of the ink, allowing you to work on a variety of substrates, including even balloons. This innovation overcomes the traditional limitations in LED manufacturing that require specialized facilities and equipment.

"Our ink is specifically designed for use in conventional pens, making this method affordable and easy. We aimed for the elasticity of each layer of the device so that it can bend, stretch and even curl without losing functionality," emphasizes Junyi Zhao, one of the authors of this innovation.

This discovery opens up new horizons for the flexible LEDs and functional devices of the future, and demonstrates the potential for practical applications in next-generation wearable devices.

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mercury telescope 15.04.2009

Back in 1908, the American physicist Robert Wood built a mirror telescope in which the surface of mercury in a rotating basin half a meter in diameter served as a concave mirror.

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The disadvantage of telescopes of this kind is the impossibility of tilting, aiming and turning after the object of observation, because then the mercury will pour out of the rotating vessel. However, in some astronomical studies, this shortcoming is of no fundamental importance and is atoned for by the simplicity and low cost of creating large-diameter mirrors.

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