Regulation of double luminescence centers based on the evolution of disordered local structure for ratiometric temperature sensing applications

Abstract

A “single site but two local environments” phenomenon in Sr2.99−xEu0.01La1+xP3−xSixO12 phosphors yields an applicable Sr of ≥1% K−1 in 303–530 K and a repeatability capability of over 99% for ratiometric temperature sensing applications.

Two luminescent film sensors constructed from new lanthanide coordination polymers for ratiometric detection of Zn2+ and NH3 in water and their white emission properties

“…11,12 Lanthanide coordination polymers (LnCPs) mean that some photoactive Ln 3+ ions are introduced into the polymer host for characteristic luminescent functionalization due to their excellent optical properties, 13–16 such as long luminescent lifetime, narrow and sharp emission and large Stokes shift, which also makes them widely used in ratiometric sensing. 17–19 Among many organic ligands for constructing luminescent LnCPs, multi-monodentate salicylamide ligands have shown advances in structural diversity and excellent sensitizing performance because they not only have salicylamide chromophores to sensitize the emission of Eu 3+ and Tb 3+ as a result of their better energy matching, but they also possess chelating flexibility due to their multi-monodentate features. 20 However, the poor water resistance of such types of compounds prevents their use in sensing applications, especially for use in water samples.…”

Near-UV excited multifunctional near-infrared phosphors for anti-counterfeiting and ratiometric thermometer applications

“…The temperature dependence was more obvious for Ca 2 Sn 1.982 Cr 0.018 Al 1.982 Si 0.018 O 9 due to the concentration-induced thermal quenching effect. 30,31 To quantitatively evaluate the temperature-sensing ability, the relative sensitivity ( S r ) value at various temperatures can be calculated by utilizing the following equation: 32,33 …”

“…where 30,31 To quantitatively evaluate the temperature-sensing ability, the relative sensitivity (S r ) value at various temperatures can be calculated by utilizing the following equation: 32,33 S r ¼…”

“…Fast and accurate temperature monitoring is becoming progressively important in medical diagnosis, scientific research, industrial production, and human daily life. 5,32 Among the myriad of options, ratiometric optical thermometry based on the fluorescence intensity ratio (FIR) method has proved to be a very promising alternative as a useful noninvasive technique due to its unique advantages ranging from high spatial resolution and detection sensitivity to rapid response, opening new possibilities for the understanding of the rules governing the processes in biological fluids. 5 Back et al reported that Bi 2 Ga 4 O 9 :Cr 3+ displayed dual near-infrared emission, achieving a ratiometric nanothermometer with a relative sensitivity value of 0.7% K −1 in the physiological range.…”

Improved optical thermometric sensitivity of Eu3+‐doped calcium niobate phosphor via nonstoichiometric control

“…So far, the great majority of current FIR temperature sensor exploits the emissions of the lanthanide ions, such as Eu 3+ /Tb 3+ , 8,9 Yb 3+ /Er 3+ , 10–12,13 Ce 3+ /Tb 3+ , 14,15 Eu 2+ /Eu 3+ , 16–18 and Pr 3+ /Tb 3+ , 19,20 to obtain two discriminable emissions. However, the temperature measurement performance of optical thermometers is still unsatisfactory because trivalent lanthanide ions generally suffer from the inherent disadvantages of the relatively low emission intensity and narrow excitation range due to the forbidden character by the selection rules of the 4f–4f transitions 21–23 …”