New research from the lab of Ali Javey, professor of electrical engineering and computer sciences, may lead to the development of “invisible” or vanishing displays — or even futuristic applications such as light-emitting tattoos. The researchers created a proof-of-concept device, using a monolayer semiconductor just three atoms thick, which is bright when turned on but becomes fully transparent when turned off. The advance builds on previous research from the lab published in 2015, which explained how monolayer semiconductors could produce bright light. Their latest work overcomes what had been major obstacles in utilizing LED technology on monolayer semiconductors, and allows researchers to keep the thickness small but the width and length large, creating a high intensity of light. The team will now be working to improve the efficiency of the technology.