Figure 1 (IMAGE) Science China Press Caption Green- and red-light emission observed at high and low view angles from the periodic nanostructures of mixed-halide perovskite CH3NH3PbBrxI3-x. Credit @Science China Press Usage Restrictions Use with credits 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.