Pressure-Triggered Fluorescence Intensity Ratio Variations of YNbO 4 :Bi 3+ /Ln 3+ (Ln = Eu or Sm) for High-Sensitivity Optical Pressure Sensing.

Optical pressure sensing by phosphors is a growing area of research. However, the main pressure measurement methods rely on the movement of the central peak position, which has significant drawbacks for practical applications. This paper demonstrates the feasibility of using the fluorescence intensity ratio (FIR) of different emission peaks for pressure sensing. The FIR ( I Bi 3+ / I Ln 3+ ) values of the synthesized YNbO 4 :Bi 3+ /Ln 3+ (Ln = Eu or Sm) phosphors are all first-order exponentially related to pressure, and YNbO 4 :Bi 3+ /Ln 3+ (Ln = Eu or Sm) phosphors have high pressure-sensing sensitivities ( S p and S pr ), which are 6 times higher than those from our previously reported work. In addition, the changes in FIR values during the decompression process were also calculated, and the trend was similar to that during the compression process. The YNbO 4 :Bi 3+ ,Eu 3+ phosphor has better pressure recovery performance. In summary, the YNbO 4 :Bi 3+ /Ln 3+ (Ln = Eu or Sm) phosphors reported in this paper are expected to be applied in the field of optical pressure sensing, and this study provides a new approach and perspective for designing new phosphors for pressure measurement.