Blue-light perovskite-based LED (IMAGE) Linköping University Caption Researchers at Linköping University, Sweden, have developed efficient blue light-emitting diodes based on halide perovskites. Credit Thor Balkhed Usage Restrictions Please use appropriate caption and credit. 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.