Eu²⁺ emission from thermally coupled levels – new frontiers for ultrasensitive luminescence thermometry

Abstract

A new strategy for noninvasive temperature probing, applying the temperature-induced configuration crossover between the thermally-coupled 6P7/2 and 5d1 levels of Eu2+ is presented.

A lanthanide nanocomposite with cross-relaxation enhanced near-infrared emissions as a ratiometric nanothermometer

“…As an inherent characteristic, the luminescence lifetime is negligibly affected by biological tissues that can improve the accuracy of the readouts. [23][24][25] On the other hand, nanothermometers based on the intensity ratio have the advantage of simple signal collection leading to fast detection speed, which is better for real-time tracking of rapid temperature change. 22 For example, the pioneering work of Capobianco et al demonstrated the application of the Er 3+ -doped upconversion nanothermometer with a ratiometric signal output to eliminate the deviation in spectral measurement caused by the absorption and scattering from biological tissue.…”

“…27 It is worth noting that Lis and Martı ´n et al recently developed luminescence thermometers using both the lifetime and intensity ratio as signals, which can achieve ideal thermal sensitivity and low uncertainty. 23,25 Near-infrared (NIR) biological windows (BWs), of which the first, second and third NIR BW are located at 650-950 nm (NIR-I), 1000-1350 nm (NIR-II) and 1350-2400 nm (NIR-III), respectively, 28 are suitable for the optical detection of temperature in vivo due to the relatively low extinction coefficient at these regions. The development of LNTs working at the NIR BW, especially at NIR-II/III with higher imaging resolution, has emerged as an important topic in recent years.…”

“…27 It is worth noting that Lis and Martín et al recently developed luminescence thermometers using both the lifetime and intensity ratio as signals, which can achieve ideal thermal sensitivity and low uncertainty. 23,25…”

Designing bifunctional platforms for LED devices and luminescence lifetime thermometers: a case of non-rare-earth Mn4+ doped tantalate phosphors

“…33 Generally, with an increase of temperature, the lifetime would decrease owing to the change of radiative and nonradiative transition rates under thermal quenching; in addition, it was found that lower thermal stability will result in faster fluorescence lifetime declines. 34,35 Furthermore, the temperature-dependent lifetime (TDL) technique is based on the ratio of the initial lifetime (τ 0 ) and lifetime (τ) at high temperature with the help of Struck and Fonger models. In short, the lower thermal stability can provide a possibility for application in luminescence lifetime thermometers.…”

Phase Transition‐Driven Highly Sensitive, NIR–NIR Band‐Shape Luminescent Thermometer Based on LiYO2:Nd3+

“…[5,6,9] For the materials that are currently most intensively used and studied in luminescence thermometry, i.e., inorganic materials doped with luminescent ions, two strategies are currently employed, 1) the utilization of singly doped materials; and 2) exploitation of Co-doped materials. [10][11][12][13][14][15][16][17][18][19][20][21][22] While the latter approach yields very promising results, there is a significant risk that scaling-up the synthesis of materials to amounts required by industry, the inhomogeneous distribution of dopant ions and their clustering may occur. This may modify the thermometric performance of the phosphor and lead to an unreliable temperature readout.…”