William Dichtel - LED (raw footage) (VIDEO) Northwestern University This video is under embargo. Please login to access this video. Caption A Northwestern University chemist and his research team have developed a modified covalent organic framework (COF) material that can power a light-emitting diode. Credit American Chemical Society Usage Restrictions Credit must be given. 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.