2-Color Light Emission (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Berkeley Lab researchers have developed unqiue semiconductor tetrapods that under illumination break Kasha’s rule for photoluminescence by emitting two colors of light. Credit courtesy of Alivisatos research group 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.