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

초록

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 SiOx, AlOx, and SiOx-AlOx by monitoring photoluminescence (PL) intensity, morphology, and phase under various envi-ronmental 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 SiOx-AlOx embedment for CPB QDs demonstrated better stability than the use of single-oxide embedment (SiOx and AlOx). 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.

키워드