Phosphonic Groups Make GaN LEDs Brighter, More Stable (image) North Carolina State University Share Print E-Mail Caption By coating polar gallium nitride with phosphonic groups, NC State University researchers made the material more stable and increased luminescence without increasing energy input. Credit Stewart Wilkins Usage Restrictions Image credit must be given. Share Print E-Mail 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.