Temperature sensing based on the up-conversion emission of Tm3+ in a single KLuF4 microcrystal

Synthesis and luminescence properties of Eu3+-activated BiF3 nanoparticles for optical thermometry and fluorescence imaging in rice root

“…2(d). As demonstrated, the sensor sensitivity exhibited an upward tendency with temperature, reaching a maximum of about 3.4 Â 10 À5 K À1 at 443 K. Clearly, the calculated sensor sensitivity was comparable to that of other optical sensing materials, such as NaYbF 4 :Tm 3+ , KLuF 4 :Tm 3+ , and PbF 2 :Tm 3+ /Yb 3+ , [41][42][43] which further conrms that the Eu 3+ -activated BiF 3 nanoparticles are suitable for optical thermometry using the FIR technique.…”

A novel Sm3+ singly doped LiCa3ZnV3O12 phosphor: a potential luminescent material for multifunctional applications

“…On the other hand, temperature is regarded as a crucial constant since it can induce some signicant changes in the elds of industrial manufacture, medical diagnosis, scientic research, and daily life. [20][21][22][23] Hence, its monitoring with high spatial resolution and accuracy is important. Nowadays, the non-contact optical temperature sensor, which utilizes the uorescence intensity ratio (FIR) route based on the temperature-dependent emission spectra of two thermally coupled levels of rare-earth ions, has been widely developed to measure the temperature of some inaccessible objects on account of its preponderances of high sensor sensitivity, fast response et al 24,25 Through analyzing the energy level distribution of the rare-earth ions, some of them, such as Er 3+ , Tm 3+ , Nd 3+ and Eu 3+ , possess pairs of thermally coupled levels.…”

Reversible luminescence modulation and temperature‐sensing properties of Pr3+/Yb3+ codoped K0.5Na0.5NbO3 ceramics

“…Particularly, the optical temperature sensors based on the thermally coupled levels of the RE ions have been realized through the fluorescence intensity radio (FIR) technique . Generally, the energy gap between two adjacent thermally coupled levels should be in the range of 200‐2000 cm −1 . So far, a few RE ions such as Ho 3+ ( 5 F 1 / 5 G 6 and 5 F 2,3 / 3 K 8 ), Tm 3+ ( 3 F 2,3 and 3 H 4 ), Er 3+ ( 2 H 11/2 and 4 S 3/2 ) and Pr 3+ ( 3 P 0 and 3 P 1 ) have been confirmed to have a pair of thermally coupled levels .…”