A Chinese research team recently develop a stretchable light-emitting devices which delivers information and can be attached to human skin and other surfaces. The device is like a temporary tattoo and can be operated at low voltage so it does not cause harm to users. Published in ACS Materials Letter in October 2019, the results from researchers at Nanjing University in China demonstrated stretchable light-emitting devices called alternating-current electroluminescent (ACEL) displays. The device has a sandwiched structure with an electroluminescent layer made of light-em...