Electroluminescence measurement experimental setup (IMAGE) Osaka Metropolitan University Caption Lamp light passes through the light-emitting electrochemical cell (LEC), driven by square wave bias, to observe signal absorption using spectrophotometry. Electroluminescence (EL) generates light when electrons recombine with electron holes, shedding excess energy in the form of photons. Credit Katsuichi Kanemoto, Osaka Metropolitan University Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Original 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.