A flexible and portable all-fiber temperature sensor based on the upconversion luminescence of octahedral NaBi(WO₄)₂:Er³⁺/Yb³⁺ phosphors

Abstract

Octahedral NaBi(WO4)2:Er3+/Yb3+ phosphors were synthesized by a hydrothermal method.

Tunable nonlinear absorption and optical limiting behavior of NaBi(MoxW1−xO4)2 single crystals with ratio of Molybdenum/Tungsten

“…NaBi(WO 4 ) 2 and NaBi(MoO 4 ) 2 are two members of this group and the device applications of these compounds are increasing in recent years. Device application studies indicated that NaBi(MoO 4 ) 2 and NaBi(WO 4 ) 2 may be used in light emitting diodes, scintillators, temperature sensors, gas sensing devices [6][7][8][9][10][11]. Both compounds crystallize in tetragonal structure with reported lattice parameters of a = b = 5.272 Å, c = 11.577 Å for NaBi(MoO4)2 and a = b = 5.265 Å, c = 11.429 Å for NaBi(WO4)2 [12][13][14].…”

NaYF4:Yb3+/Tm3+@NaYF4:Yb3+ Upconversion Nanoparticles for Optical Temperature Monitoring and Self-Heating in Photothermal Therapy

“…Currently, non-contact optical temperature sensing techniques based on rare-earth upconversion are divided into methods based on fluorescence lifetime, spectral position, spectral width, individual fluorescence peak intensity, and two fluorescence peak intensity ratios (FIRs). , Among the many methods, the FIR-based approach is one of the more researched non-contact temperature sensing techniques due to its independence from spectral fluctuations. − This approach requires the use of the ratio of two fluorescence emission peaks to calibrate the temperature, which can eliminate the influence of non-temperature factors such as the power of the excitation source and the concentration of the emitting center, which respond differently to temperature. As a result, the FIR value will vary with temperature to enable temperature sensing.…”