A comparative study on the optical and structural degradation behaviors and enhanced stability of CsPbBr₃ embedded in oxide barriers

A series of experiments were conducted to investigate the optical and structural degradation behavior and enhanced stability of CsPbBr₃ quantum dots (CPB QDs) embedded in oxide barrier materials such as SiO_x, AlO_x, and SiO_x–AlO_x by monitoring photoluminescence (PL) intensity, morphology, and phase under various environmental conditions such as UV exposure and ambient temperatures. Pristine CPB QDs showed a significant reduction in PL intensity under all environmental conditions even in the dark. The CPB QDs embedded in oxide materials showed relatively enhanced stabilities in general. The use of mixed-oxide SiO_x–AlO_x embedment for CPB QDs demonstrated better stability than the use of single-oxide embedment (SiO_x and AlO_x). The enhanced stability could be attributed to the reduced number of defects such as pinholes and voids by the synergistic effect of mixed oxides as barrier layers. These results offer an avenue and better understanding to improve the stability of CPB QDs for diverse applications.