Cr³⁺based nanocrystalline luminescent thermometers operating in a temporal domain

Abstract

The Cr3+ doped nanocrystals were examined as a noncontact temperature sensor in the lifetime-based approach. The impact of both the analysis protocol and host material in the lifetime-base has been...

Wide Dynamic Range Thermometer Based on Luminescent Optical Cavities in Ga2O3:Cr Nanowires

“…[5,12,13] Besides, several reported luminescence sensors cover wide temperature ranges. [2,14,15] On the other hand, single nanowires (NW) and fibers have also been proposed for thermometers at the micro-and nanoscale via optical or electrical transducing mechanisms, although in the latter case electrical contacts are needed. [16][17][18] The elongated morphology of wires and fibers allows optical waveguiding and, hence, interference effects could be exploited for temperature sensing.…”

NIR luminescence lifetime nanothermometry based on phonon assisted Yb3+–Nd3+energy transfer

“…organic dyes, fluorescent proteins, most QDs), the luminescence lifetime of excited states of lanthanides is almost unaffected by the absorption or scattering by the medium and, when the surface of the phosphor is isolated from the surroundings by the optically passive shell, its kinetics is also independent on the local chemical environment. Despite this concept is promising, the relative sensitivity of lifetime-based LT is usually considered as lower with respect to the ratiometric counterpart 5,[28][29][30][31] . This is because the excited levels kinetics is modified by quenching through temperature dependent multiphonon processes.…”

Real‐Time Thermal Imaging based on the Simultaneous Rise and Decay Luminescence Lifetime Thermometry

“…[1,2] There are three main methods for the temperature reading, which measure 1) the ratio of emission intensity using from thermally coupled levels, 2) luminescence lifetime, and 3) spectral shift of the emission or the integrated intensity of a given transition. [1,2] The most common approach is based on the intensity ratio of two thermally coupled (or even nonthermally coupled) transitions (luminescence intensity ratio, LIR), considered to be self-referenced, [3][4][5][6][7][8][9] since there is no need for another reference system. However, the medium-induced optical distortions can significantly affect the temperature readout using the LIR method in the near-infrared (NIR) domain [10] by up to 6 K (%10% of the expected value).…”

“…[3][4][5]11] Usually, for lifetime thermometry, the emission decay is monitored either as a rise time [6] or a decay time. [3][4][5]7,8] Unfortunately, thermal imaging using standard lifetime determination presents some drawbacks. [12,13] In the case of a short emission lifetime (ns range), the emission is monitored using fluorescence lifetime imaging (FLIM) using a relatively expensive infrastructure.…”

“…[8] In the case of ms or s range lifetimes, thermal imaging is achieved using a time-gated camera (e.g., iCCD, CMOS, and interline CCD) correlated/synchronized with a modulated pulse excitation source (e.g., LED, laser, and flash lamp), leading to a relatively long acquisition time. [4][5][6][7][14][15][16][17] Using time-gated camera, the emission decay is reconstructed on each pixel of the camera. Still, reports on thermal imaging using lifetime thermometry using different acquisition methods are starting to emerge.…”