Structure, up-conversion luminescence and optical temperature sensitive properties of glass ceramics containing Ca5(PO4)3F with double luminescence centers

In this study, CaF2-ZnO-P2O5-CaO-SiO2 system glass ceramics containing Ca-5(PO4)(3)F nanocrystals were prepared via melting and crystallization, and their structure, up-conversion luminescence properties and energy transfer were investigated. Owing to the different temperature dependences of the three emitting bands at 523, 547 and 659 nm, dual-mode temperature measurement can be realized according to the employed fluorescence intensity ratio technology. Using thermal-coupled energy levels, the maximum relative sensitivity (Sr-max) and absolute sensitivity (Sa-max) were found to be 1.71% K-1 and 0.69% K-1, respectively. Moreover, the maximum relative sensitivity (Sr-max) and absolute sensitivity (Sa-max) were found to be 2.19% K-1 and 0.11% K-1, respectively, based on the nonthermal coupled energy levels. This shows that fluoroapatite transparent glass ceramics have latent application prospects in the optical temperature measurement field.

Automated summary

Glass ceramics containing Ca-5(PO4)(3)F nanocrystals were prepared and studied for their structure, up-conversion luminescence properties, and energy transfer. Dual-mode temperature measurement was achieved using fluorescence intensity ratio technology. The study showed potential application prospects of fluoroapatite transparent glass ceramics in the optical temperature measurement field.