Bi3+-based luminescent thermometry in perovskite-type CaZrO3 phosphor

Based on the luminescence of Bi 3+ , novel temperature sensing materials CaZrO 3 :Bi 3+ and CaZrO 3 :Bi 3+ /Sm 3+ were successfully synthesized by solid-state reaction. The XRD patterns show that the synthesized materials have a pure phase of CaZrO 3 . The XPS results show that the Bi 3+ and Sm 3+ can be detected in CaZrO 3 :Bi 3+ /Sm 3+ . With the excitation of 318 nm, the CaZrO 3 :Bi 3+ material shows intense temperature-dependent luminescence. The maximum relative sensitivity can be obtained at 440 K (1.78% K −1 ). Under the excitation of 408 nm, the CaZrO 3 :Sm 3+ material shows the characteristic emission peaks of Sm 3+ . The spectral overlap between the emission spectrum of Bi 3+ and the excitation spectrum of Sm 3+ leads to an energy transfer from Bi 3+ to Sm 3+ in CaZrO 3 :Bi 3+ /Sm 3+ phosphor. With the excitation of 318 nm, the emission spectrum of CaZrO 3 :Bi 3+ /Sm 3+ material shows the characteristic peaks of Bi 3+ and Sm 3+ . The fluorescence decay curves also show the evidence of the energy transfer from Bi 3+ to Sm 3+ . The luminescence intensity ratio of Sm 3+ and Bi 3+ in CaZrO 3 :Bi 3+ /Sm 3+ shows obvious temperature dependence. Based on the luminescence intensity ratio, a large relative sensitivity is obtained at 443 K (1.15% K −1 ).