Luminescence thermometry based on downshifting and upconversion photoluminescence of Bi4Ti3O12:Yb3+/Pr3+ ceramic

Abstract

Yb3+/Pr3+ codoped Bi4Ti3O12 (abbreviated as Bi4Ti3O12:Yb3+/Pr3+) ceramic was successfully fabricated by solid state sintering method. The structural, morphological and luminescence properties were investigated by X-Ray diffraction, scanning electron microscopy, steady-state downshifting and upconversion photoluminescence spectra. Green and red downshifting emissions can be effectively excited by 450 nm blue light irradiation. The intensity ratios of downshifting green and red emissions are sensitive to temperature. The spectral positions of downshifting green and red emissions show blue-shift with elevation of temperature. Under 980 nm excitation, the tempreature dependent upconversion photoluminescence were recorded. Based on fluorescence intensity ratio of 545 nm and 623 nm in upconversion emission spectra, temperature sensing was achieved with maximum absolute sensitivity value of 0.0068 K-1 at 443 K. These results show Bi4Ti3O12:Yb3+/Pr3+ ceramic is a promising candidate for luminescence thermometry, which may find its applications in the scientific research and industry.

Upconversion red light emission and luminescence thermometry of Gd2O3:Er3+ @Gd2O3:Yb3+ core-shell nanofibers synthesized via electrospinning

“…6, the experimental data can be fitted by a straight line, which is marked red. The linear fitting function of the temperature dependent VPR (I 680.31nm / I 683.03nm ) in the temperature range from 303 K to 543 K can be written as the equation (3).…”

“…However, with continued developing of modern industry, these traditional themometers encounter plenty of challenges included hazardous working environment, biological environment, wide temperature range, motion with high speed, micro-nano scale. Luminescence thermometry based on spectral parameters such as emission intensity, bandshape, position of emission bands, spectral width and luminescence lifetime of nanophosphors has attracted many attentions due to the advantages of high spatial resolution, rapid response and non-invasiveness, which may show great potential in microelectronics and precise medical measurement [1][2][3][4][5]. Therefore, it is of great importance to develop nanophosphors for temperature sensing applications.…”