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Light-emitting tattoos could indicate dehydration in athletes or health conditions in hospital patients.
- Researchers at UCL and IIT have created a temporary tattoo that contains the same OLED technology that is used in TVs and smartphones.
- This technology has already been successfully applied to various materials including glass, food items, plastic, and paper packaging.
- This advance in technology isn't just about aesthetics. "In healthcare, they could emit light when there is a change in a patient's condition - or, if the tattoo was turned the other way into the skin, they could potentially be combined with light-sensitive therapies to target cancer cells, for instance," explains senior author Franco Cacialli of UCL.
Why “smart tattoos” could be beneficial<img class="rm-lazyloadable-image rm-shortcode" type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNTcwNTMwNS9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYyNDk2OTAzNX0.59Z70jErmubZzIj-mKsOnmWpArvlFbbfY7NNg3bg9M8/img.jpg?width=1245&coordinates=0%2C299%2C0%2C299&height=700" id="15b1d" width="1245" height="700" data-rm-shortcode-id="3c302e3bfde24fb05fd364df12b4ce3b" data-rm-shortcode-name="rebelmouse-image" alt="OLED light held in man's hand on black background" />
OLEDs are used to create digital displays in devices (such as television screens computer monitors, smartphones, etc).
Credit: Hanna on Adobe Stock<p>While this is perhaps the most obvious way you could use light-emitting tattoo technology, the world of tattoo art and design could see a huge surge in new exciting trends based on light-emitting tattoo technology.</p><p><strong>It's not just about looks—this approach provides a quick and easy method of transferring OLEDs onto practically any surface.</strong> </p><p>OLEDs are used to create digital displays in devices (such as television screens computer monitors, smartphones, etc). While some may get OLED and LED confused, they are quite different, with OLED displays emitting visible light and therefore being able to be used without a backlight. The breakthrough process of being able to transfer OLEDs onto virtually any surface can be useful in many different applications and settings. </p><p><strong>Light-emitting tattoos could be used to indicate (and potentially even treat) various health conditions in the future.</strong></p><p>The eventual implementation or use of OLED tattoos could be combined with other tattoo electronics to, for instance, emit light when an athlete is dehydrated, or when a person is being exposed to too much sun and is prone to sunburn. </p><p>"In healthcare, they could emit light when there is a change in a patient's condition - or, if the tattoo was turned the other way into the skin, they could potentially be combined with light-sensitive therapies to target cancer cells, for instance." - Professor Franco Cacialli (UCL)</p>
OLED tattoo devices
Credit: Barsotti - Italian Institute of Technology<p><br><strong>Similarly, this technology could be used on the packaging of various items to give us more information about them.</strong></p><p>For example, OLEDs could be tattooed onto the packaging of a fruit to signal when the product is passed its expiration date or will soon become inedible.</p><p>In reality, creating light-emitting tattoo technology doesn't have to be expensive.</p><p>Professor Franco Cacialli explains to <a href="https://www.eurekalert.org/pub_releases/2021-02/ucl-lte022621.php" target="_blank" rel="noopener noreferrer">Eurekalert</a>: "The tattooable OLEDs that we have demonstrated for the first time can be made at scale and very cheaply. They can be combined with other forms of tattoo electronics for a very wide range of possible uses. These could be for fashion - for instance, providing glowing tattoos and light-emitting fingernails. In sports, they could be combined with a sweat sensor to signal dehydration."</p><p>"Our proof-of-concept study is the first step. Future challenges will include encapsulating the OLEDs as much as possible to stop them from degrading quickly through contact with air, as well as integrating the device with a battery or supercapacitor."</p>
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