Structure of the Proposed Material (IMAGE) Tokyo Institute of Technology Caption This is the crystalline structure of the proposed material. The green dots represent cesium atoms, and the blue bodies correspond to the [Cu2I5]3 units that are confined between them. The cesium atoms plus the [Cu2I5]3 units can be regarded as core-shell structures, which enhance the photoluminescent properties of the material. Credit Advanced Materials 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.