Blue Light-Emitting Diode (IMAGE) University of California - Berkeley Caption UC Berkeley chemists created a type of halide perovskite crystal that emits blue light, something that has been hard to achieve with this trendy new material. But the researchers discovered that these materials are inherently unstable, requiring careful control of temperature and chemical environment to maintain their precise color. This instability may have other applications, however. Credit Peidong Yang, UC Berkeley 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.