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

Abstract

In this study, CaF 2 –ZnO–P 2 O 5 –CaO–SiO 2 system glass ceramics containing Ca 5 (PO 4 ) 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 ( S r-max ) and absolute sensitivity ( S a-max ) were found to be 1.71% K -1 and 0.69% K -1 , respectively. Moreover, the maximum relative sensitivity (S r-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.