Cross-sectional Photoluminescence Map of a Partially Reacted Perovskite Sample (image) Ecole Polytechnique Fédérale de Lausanne Share Print E-Mail Caption Cross-sectional photoluminescence map of a partially reacted sample. Emission between 500 and 550 nm attributed to lead iodide is shown in green while the emission between 700 and 800 nm attributed to perovskite is shown in red. Image shows an area of 20 μm x 10 μm. Credit M. Grätzel/EPFL Usage Restrictions Media purposes only 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.