Multimode high-sensitivity optical YVO₄:Ln³⁺ nanothermometers (Ln³⁺ = Eu³⁺, Dy³⁺, Sm³⁺) using charge transfer band features

Abstract

Accurate thermal sensing with good spatial resolution is currently required in variety of scientific and technological areas. Luminescence nanothermometry has shown competitive superiority for contactless temperature sensing especially at the...

Cooperatively Responding Thermal Sensing in Erbium(III)-Functionalized NaGdF4/PAN Crystal-Implanted Fiber

“…The dependence of UCL spectra on temperature is investigated under a 980 nm laser, as shown in Figure . The emission intensity of 521 nm ( 2 H 11/2 → 4 I 15/2 ) for NCs and NGF-E 1 Y 2 /PAN indicates an increasing trend with the upward temperature and 542 nm emission from an energy level coupled to 2 H 11/2 shows the opposite trend to 521 nm, which is in accordance with the Boltzmann distribution law. − Thus, the populations of two close 2 H 11/2 and 4 S 3/2 levels following the Boltzmann distribution can be determined using the following equation − where I is the luminescence intensity, K is the Boltzmann constant, Δ E is an energy gap between 2 H 11/2 and 4 S 3/2 levels, A and B are the fitting coefficients, and T is the absolute temperature.…”

Splendid four-mode optical thermometry design based on thermochromic Cs3GdGe3O9:Er3+ phosphors

“…Consequently, multi-mode luminescent thermometers are undoubtedly of high interest, and can enable the temperature monitoring signal to be more precise by integrating the superior temperature detection performance from different types of sensing modes. Dual-or three-mode optical thermometers have been developed continuously in recent years [33][34][35][36][37][38][39][40][41][42][43][44] and are mainly classified into four categories. One is the FIR techniques that combine TECL with NTECL.…”

Double-doped YVO4 nanoparticles as optical dual-center ratiometric thermometers

“…[5][6][7] Optical thermometry, where temperature reading is based on monitoring temperature-sensitive luminescence parameters, has emerged as one of the most perspective non-contact sensing techniques. [8][9][10] The ratiometric approach is a self-referencing method providing accurate thermometry due to high immunity toward systematic errors linked to excitation power fluctuations, phosphor quantity, and its spatial distribution. To date, ratiometric thermometry has been successfully performed in single and dual-center samples.…”