Effective Singlet Oxygen Generation in Silica-Coated CsPbBr₃ Quantum Dots through Energy Transfer for Photocatalysis

Here, silica-coated CsPbBr₃ quantum dots (QDs) were demonstrated to be effective photosensitizers for the generation of singlet oxygen (¹ O₂ ). The silica encapsulation improved the stability of the perovskite QDs while also preserving an excellent light-harvesting capability in the visible-light region. The appropriate exciton binding energy and dark exciton generation characteristics of perovskite QDs may be responsible for the energy transfer. The high oxidizability of ¹ O₂ makes the material attractive for application in decomposition of organic dyes such as methyl orange. This work provides new insight for designing excellent perovskite-based photocatalysts.