New Type of LED (IMAGE) Princeton University, Engineering School Caption A new type of LED is made with crystalline substances known as perovskites. Credit Sameer A. Khan/Fotobuddy Usage Restrictions non-commercial use 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.