Atomically thin light-emitting device opens the possibility for 'invisible' displays

UC Berkeley engineers have built a bright-light emitting device that is millimeters wide and fully transparent when turned off. The light emitting material in this device is a monolayer semiconductor, which is just three atoms thick. The device opens the door to invisible displays on walls and windows -- displays that would be bright when turned on but see-through when turned off -- or in futuristic applications such as light-emitting tattoos, according to the researchers. "The materials are s