Figure 1 (IMAGE) Science China Press Caption The PL intensity ratio of PEC-TPB at 470 and 390 nm (I470/I390) with different concentrations of KBr at 0.1%, 0.15% and 0.2% TPB-3 in PEC Credit ©Science China Press Usage Restrictions Use with 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.