Sr2GdF7:Tm3+/Yb3+ glass ceramic: A highly sensitive optical thermometer based on FIR technique

Synthesis and up‐conversion of Er3+ and Yb3+ Co‐doped LiY(MoO4)2@SiO2 for optical thermometry applications

“…Then following the energy transfer (ET) process, green emissions of Er 3+ can be easily generated through the rapid non-radiative relaxation from 4 F 7/2 to the next lower states 2 H 11/2 and 4 S 3/2 . Similarly, the red emission is generated by the radiative transition from 4 F 9/2 to the ground state, 4 A large change in FIR may cut down the accuracy of optical thermometer. 8,39 To further take full use of the materials under investigation, we measured the changes in FIR by varying the pumping power ( Figure 11).…”

“…Since FIR is independent of the fluorescence loss and fluctuation under excitation, the temperature dependence of the measurement conditions can be negligible. As the groundwork of many temperature‐sensitive optical devices, the FIR technique takes advantage of two adjacent thermally coupled energy levels (TCELs) of rare earth ions . Thanks to the wide choice of temperature range, flexible device structures and controllable energy levels, the FIR based non‐contact temperature sensor is regarded as a promising option for optical thermometry .…”

“…As the groundwork of many temperature-sensitive optical devices, the FIR technique takes advantage of two adjacent thermally coupled energy levels (TCELs) of rare earth ions. [4][5][6][7] Thanks to the wide choice of temperature range, flexible device structures and controllable energy levels, the FIR based non-contact temperature sensor is regarded as a promising option for optical thermometry. 1,2,8 On the other hand, in order to avoid the strong overlap between the two emission levels, the energy gap between them should be in the range of 200-2000 cm −1 so that the ratio of the TCELs can eliminate the influence of the spectral losses.…”

A novel Nd3+‐doped MgO‐Al2O3‐SiO2‐based transparent glass‐ceramics: Toward excellent fluorescence properties

“…In the past few years, various RE ions have been added to glass components to prepare transparent glass‐ceramics with special functions. Examples include Eu 3+ , Er 3+ , Tm 3+ , Sm 3+ , Tb 3+ , Dy 3+ , Ce 3+ , Nd 3+ , and Yb 3+ , etc. Among these RE ions, Nd 3+ is one of the most important active ions and the Nd 3+ ‐doped transparent glass‐ceramics are often used in the field of solid‐state laser because Nd 3+ ion has the advantages of high absorption coefficient, high emission cross‐section, long fluorescence decay time, wide absorption band, and large fluorescence branching ratio, etc .…”

Self-calibrated optical thermometer based on luminescence from SrLu2O4:Bi3+,Eu3+ phosphors

“…Recently, optical temperature sensors based on non-contact detection mode with rare earth (RE) ions doped luminescent materials have attracted extensive attention. [1][2][3][4][5][6][7][8] Commonly, temperature sensing optical parameters, such as emission intensity, luminescent lifetime and the uorescence intensity ratio (FIR) have been widely adopted for their non-contact operating mode. 5,9 However, the measurement accuracy of temperature sensing strategy, which is based on the emission intensity, could be strongly affected by the external factors.…”