Tm3+/Yb3+ codoped CaGdAlO4 phosphors for wide-range optical temperature sensing

Sesame ball-like PTT nanoplatforms with fluorescence-background-free temperature sensing

“…It is found that the afterglow intensity of the nanothermometer increases with the increasing temperature from 29 to 43.7 °C. According to the following quantified repeatability equation: 50 where Δ c is the mean value of the afterglow intensity and Δ i is the measured value of the afterglow intensity for each cycle. The reproducibility value of the nanothermometer was found to be about 98–98.8%.…”

Na2GdMg2V3O12:Sm3+ phosphors for three‐mode optical temperature sensing

“…It can be used for safety mark of temperature. For FIR technique, most of them are based on thermally coupled energy levels (TCELs), such as 2 H 11/2 , 4 S 3/2 levels of Er 3+ , 13 3 F 2,3 , 3 H 4 levels of Tm 3+ , 14 and 5 S 2 , 5 F 4 levels of Ho 3+ 15 . Because of limitation of energy difference (200–2000 cm −1 ), their S R are low especially at high temperature 16 .…”

Comparative studies of upconversion luminescence and optical temperature sensing in Tm3+/Yb3+ codoped LaVO4 and GdVO4 phosphors

“…Rare earth doped upconverting phosphors, which convert lower-energy photons to higher-energy photons, have triggered widespread interest in recent decades because of their excellent properties and vast potential applications in solar cells, display devices, light emitting diodes, bio-imaging, optical thermometry etc. [1][2][3][4][5][6][7][8] Nevertheless, upconversion (UC) luminescent materials are currently hampered by low emission efficiency which restricts their eld applications in several cases. Therefore, it is crucial to nd ways to improve their UC efficiency.…”