temperature spectra line intensity ratio

#Temperature spectra line intensity ratio Activator#

6,13–15 Because of its large absorption portion about 980 nm, the Yb 3+ ion is commonly used as a sensitizer to increase anti-stocks emissions.

#Temperature spectra line intensity ratio Activator#

11,12 The traditional activator ions for UC Luminescence (UCL) are Er 3+, Ho 3+, Tb 3+ and Tm 3+. As it is well known, lanthanide ions have a unique electronic structure and are excellent discovery materials due to the advantages of their large Stokes decalage, their net emission profiles, and their long fluorescence lifetime. 4,10 In particular, the lanthanide (Ln) particles doped upconversion (UC) phosphors are famously utilized for the FIR strategy. 6–9 The most widely used technique is temperature-induced variations in luminescence intensity ratio (FIR) between two thermally coupled energy levels. 4,5 Now, thermometry reliant on emission line intensity, bandwidth, spectral line direction, increase or decay life of the exciting polarization stage is used. 2,3 The luminescence-based thermometry, in fact, has a number of benefits, including rapid response, high resolution and precision, and a wide temperature range. 1 Compared to traditional contact temperature measures like electrical resistance and thermocouples, which are constrained by reaction time and spatial resolution, non-contact thermometry approaches including Raman spectroscopy and luminescence are gaining traction. Introduction Temperature sensors account for 80% of the global sensor market, owing to their significance in a range of science and industrial applications. LiZnPO 4:Yb 3+–Er 3+/Ho 3+ phosphors may be useful in the development of new luminescent materials for optical temperature sensing. High sensitivities were obtained in the phosphors, and the LiZnPO 4:Yb 3+/Ho 3+ showed the largest absolute sensitivities. The red and green emissions generated from non-thermally-coupled levels were used for temperature sensing in the Ho 3+-activated LiZnPO 4. The temperature uncertainty is also evaluated. The effect of pump power on sensor sensitivities was extensively studied. The Boltzmann distribution was accompanied by the fluorescence intensity ratio (FIR) for the two green Er 3+ emissions originating from thermally-coupled levels. For Er 3+ and Ho 3+, different optical temperature sensing methods are included. The UC process was mentioned as the typical emission peaks of Er 3+ and Ho 3+. X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques were used to evaluate the phase and morphology of the samples.

In this work, various LiZnPO 4:0.5 mol% Ln 3+ (Ln = Ho, Er) phosphors with different Yb 3+ ion doping concentrations were synthesized by a sol–gel/Pechini method.