Wide-range and highly-sensitive optical thermometers based on the temperature-dependent energy transfer from Er to Nd in Er/Yb/Nd codoped NaYF4 upconversion nanocrystals

Negative thermal expansion triggered anomalous thermal upconversion luminescence behaviors in Er3+/Yb3+-codoped Y2Mo3O12 microparticles for highly sensitive thermometry

“…Since the emissions of Er 3+ and Nd 3+ ions exhibited different temperature dependence, Dong et al, found that the absolute sensitivity (i.e., S a ) of NaYF 4 :Er 3+ /Nd 3+ /Yb 3+ UC nanocrystals was 8.9% K -1 and it was higher than that of reported optical thermometers based on the TCLs. 12 Also, utilizing the temperature-dependent emissions of Er 3+ and Tm 3+ ions, Xu et al, reported that the maximum S r value of Y 2 O 3 :Er 3+ /Tm 3+ /Yb 3+ nanoparticles was 1.12% K -1 . 13 Despite of these, the implementation of optical thermometry by using UC emission is still hindered by some inherent limitations of upconverting materials, such as weak and impressionable emissions.…”

Up‐conversion and temperature sensing properties of Na2GdMg2(VO4)3:Yb3+,Er3+ phosphors

“…No references were found on modeling of the PIP process for CMCs, though experimental studies on this manufacturing process have been reported. Studies on polycarbosilanederived SiC ceramic 25 and SiC/SiC composite 26,27 have shown that porosity decreases and mechanical properties improve with the increasing number of PIP cycles. Zhu et al 28 show that increasing pyrolysis temperature and the concentration of SiC fillers in polycarbosilane polymer result in improved mechanical properties in two-dimensional Carbon/ SiC (C/SiC) composites fabricated using the PIP process.…”

Multipath optical thermometry realized in CaSc2O4: Yb3+/Er3+ with high sensitivity and superior resolution

“…In the past few years, UC materials have also been found to own outstanding temperature sensing properties which can afford a contactless thermometry in many special industries, such as coal mining, metal smelting, petrochemicals, biomedicine, and so on 10,11 . In particular, the fluorescence intensity ratio ( FIR ) between two thermally coupled energy levels of trivalent rare earth ions is considered to be a promising technology to provide fast and accurate optical thermometry, due to its rapid response capability, high spatial resolution, strong anti‐jamming ability, etc 12‐17 . Up to date, numerous trivalent rare earth ions are used for ratiometric thermometry, such as Er 3+ , Ho 3+ , Tm 3+ , Nd 3+ , and Eu 3+ 18‐25 .…”

“…10,11 In particular, the fluorescence intensity ratio (FIR) between two thermally coupled energy levels of trivalent rare earth ions is considered to be a promising technology to provide fast and accurate optical thermometry, due to its rapid response capability, high spatial resolution, strong anti-jamming ability, etc. [12][13][14][15][16][17] Up to date, numerous trivalent rare earth ions are used for ratiometric thermometry, such as Er 3+ , Ho 3+ , Tm 3+ , Nd 3+ , and Eu 3+ . [18][19][20][21][22][23][24][25] Among these ions, Er 3+ is the most widely used activator for temperature sensing which has been realized in an enormous variety of materials, due to the excellent thermal coupling between the green emitting levels 2 H 11/2 and 4 S 3/2 of Er 3+ as well as their strong UC intensity under the excitation of 980 nm excitation with the sensitization of Yb 3+ .…”