Eu3+-doped Cs4PbBr6 quantum dots incorporated into borogermanate glass-ceramics for optical temperature sensing

This research focused on investigating the encapsulation of borogermanate glass-ceramics with Eu3+-doped Cs4PbBr6 quantum dots (QDs) in a hexagonal phase. To characterize the structure and morphology of the resulting QDs glass-ceramics, we utilized X-ray diffraction (XRD) and transmission electron microscopy (TEM). Additionally, the photoluminescence (PL) spectra, absorption spectra, and energy bandgap of the Cs4PbBr6 QDs glass-ceramics were recorded at various heat-treatment temperatures. The decay time and energy transfer mechanism between the Eu3+ions and Cs4PbBr6 perovskite were also investigated. Lastly, we analyzed the material's ability to sense temperature optically based on the luminescence intensity ratio. At a temperature of 368 K, the relative sensitivity of the 1 mol% Eu3+-doped Cs4PbBr6 QDs glass-ceramics reached its highest value of 3.11%K−1. When compared with other optical sensing materials, Cs4PbBr6 QDs glass-ceramics displayed superior sensitivity. These results indicate that the Eu3+-doped Cs4PbBr6 QDs glass-ceramics have promising potential for applications in high-sensitivity optical temperature sensing.