3D Printing Innovation (IMAGE) Rutgers University Caption This is an example of simple light-sensing electronics with an LED (light-emitting diode), a light-sensitive diode (semiconductor) and power connected by a high-performance circuit inside polymer. The LED is on when exposed to light and off when light from the diode is blocked. Credit Md Naim Jahangir Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.