EL emission (IMAGE) National Institutes of Natural Sciences Caption Fig. 2 (a) Luminance–voltage curves for OLEDs. (b) Photograph of an OLED operated by a 1.5-V battery. Credit NINS/IMS Usage Restrictions None 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.