Strategy design for ratiometric luminescence thermometry: circumventing the limitation of thermally coupled levels

Abstract

State-of-the-art progress in strategy design based on the Ln3+ luminescence involving dual emission construction for ratiometric luminescence thermometry is reviewed.

Lanthanide‐Based Thermometers: At the Cutting‐Edge of Luminescence Thermometry

“…In the last decade, many Ln 3+ ‐based thermometers have been reported covering a wide temperature range, from cryogenic ( T < 100 K) to physiological (298–323 K) values, and including chelate complexes, metal organic frameworks (MOFs), polymers, organic–inorganic hybrids, upconverting, downconverting, and downshifting nanoparticles (NPs), and multifunctional heater‐thermometer nanoplatforms . The implementation of these Ln 3+ ‐based phosphors as ratiometric thermometers in diverse applications was extensively revised in the past decade, including in two books…”

Multifunctional optical thermometry based on the stark sublevels of Er3+ in CaO‐Y2O3: Yb3+/Er3+

“…Compared with conventional methods of temperature measurements, optical thermometry can realize a spatial distribution of temperature with sub‐micrometer resolution. Meanwhile, optical thermometry also owns merits such as rapid response, non‐contact, strong anti‐jamming capability and so on . At present, the research hotspot about optical thermometry mainly focuses on fluorescence intensity ratio (FIR) technology utilizing pairs of thermally coupled energy levels in rare‐earth ions .…”

“…Meanwhile, optical thermometry also owns merits such as rapid response, non-contact, strong anti-jamming capability and so on. [7][8][9][10][11][12][13][14][15] At present, the research hotspot about optical thermometry mainly focuses on fluorescence intensity ratio (FIR) technology utilizing pairs of thermally coupled energy levels in rare-earth ions. [16][17][18][19] More specifically, the two thermally coupled energy levels used in FIR technology are closely separated, so the upper level can be populated from the lower level by a thermal excitation process at higher temperature.…”

Dual Emission from Precious Metal‐Free Luminophores Consisting of C, H, O, Si, and S/P at Room Temperature

“…The disiloxybenzenes in powder simultaneously fluoresced and phosphoresced at 358-374 and 457-470 nm, respectively,u nder vacuum.T he intensity ratios of the phosphorescence/fluorescence maxima of the disiloxybenzenes in powder and in at hin film of poly-(methyl methacrylate) weres ensitive to temperature and molecular oxygen, respectively.T he plots of the relative intensity versust emperature or partial pressureofm olecular oxygen were well fitted with calibration curvesd efined by an exponential approximation with excellent correlation coefficients R 2 (0.9708-0.9921), demonstrating the high potential of the disiloxybenzenes as precious metalfree probes applicable to ratiometric luminescence sensing.Organicl uminophores that exhibit dual emission of fluorescence and phosphorescence at room temperature are versatile materials because they are applicable in bio-imaging, data security protection,w hite-light emission, and ratiometric luminescences ensing of molecular oxygen, temperature, and solvent viscosity. [1,2] To attain the dual emission at RT,au nique molecular design is essential, which balances the rates of fluorescence and intersystem crossing( ISC) and suppresses RTcaused nonradiatived ecayso ft he excited triplet states (T n ). The conventionala pproach to realize dual emission involves design of (co)polymersc onsisting of fluorescent organic chromophores andp hosphorescent precious metal complexes.…”

“…Organicl uminophores that exhibit dual emission of fluorescence and phosphorescence at room temperature are versatile materials because they are applicable in bio-imaging, data security protection,w hite-light emission, and ratiometric luminescences ensing of molecular oxygen, temperature, and solvent viscosity. [1,2] To attain the dual emission at RT,au nique molecular design is essential, which balances the rates of fluorescence and intersystem crossing( ISC) and suppresses RTcaused nonradiatived ecayso ft he excited triplet states (T n ). The conventionala pproach to realize dual emission involves design of (co)polymersc onsisting of fluorescent organic chromophores andp hosphorescent precious metal complexes.…”