Image (IMAGE) World Scientific Caption Photocatalytic process of phosphorus and nitrogen co-doped carbon quantum dots (PNCQDs)/TiO2 nanosheets. Due to the quantum wells created by synergy between N and P elements, photogenerated electrons can be localized to the dopant sites of PNCQDs, improving the quantum efficiency. Credit Authors 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.