Metal halide perovskites (MHPs) have attracted attention as new display materials due to their excellent optical properties, but their application is limited by the complexity of conventional synthesis methods and the film formation processes. As an alternative, color conversion film fabricated via the aerosol deposition (AD) process using CsPbBr₃/Al₂O₃ powder, a ceramic matrix-based MHP composite, has expanded the practical utility of MHPs by simplifying both the synthesis and film formation steps. Nevertheless, the hammering effect that occurs during the AD process can damage the MHP crystal structure, leading to degradation of its optical properties. Therefore, in this study, to overcome the problem of optical degradation, we compared the structural and photoluminescence (PL) properties of films fabricated by adding polytetrafluoroethylene (PTFE), a material with a buffering effect, to the CsPbBr₃/Al₂O₃ starting powder at mass ratios of 0, 0.1, 0.5, 1, and 2 wt% to mitigate the hammering effect. The film containing 1 wt% PTFE exhibited the highest PL performance, achieving a luminous efficiency of 52.1 lm/W. This improvement is attributed to PTFE providing an optimal buffering effect without forming aggregates on the film surface. These results further enhance the applicability of AD-based color conversion films and are expected to contribute to the development of high-resolution display technologies.
