Dual-mode optical thermometry of Sr2YNbO6:Bi3+,Eu3+ phosphors designed by response surface methodology

Response surface methodology (RSM) method can directly obtain optimal doping content of co-doped phosphors through simulation. In this paper, the optimal sample (OPT-SYNO) of Sr2YNbO6:Bi3+,Eu3+ phosphors was predicted by RSM. The structure and luminescent properties of Sr2YNbO6:Bi3+,Eu3+ phosphors were explored by X-ray diffraction and photoluminescence. And the temperature-dependent emission spectra of OPT-SYNO indicate that OPT-SYNO can realize the dual-mode optical thermometry (fluorescence intensity ratio and color coordinate) under different excitation. Under 338 nm excitation, the maximum values of SR and SA are 0.898 %K−1 (453 K) and 4.285 %K−1 (573 K), respectively. The above results show that Sr2YNbO6:Bi3+,Eu3+ has potential application in the field of optical temperature measurement.