Highly Sensitive and Highly Emissive Luminescent Thermometers for Elevated Temperatures Based on Lanthanide-Doped Polymers

Tcelykh, Lyubov O.; Latipov, Egor V.; Лепнев, Л. С.; Anosov, Andrei; Kozhevnikova, Vladislava Yu.; Kuzmina, Natalia; Utochnikova, Valentina V.

doi:10.3390/inorganics11050189

Cited by 2 publications

(2 citation statements)

References 28 publications

(33 reference statements)

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“…The legitimization of Eu and Tb complexes with polymers has allowed for high sensitivity of luminescent thermometers at high temperatures and thermal stability of the compound. For example, the alloying of Eu and Tb complexes with poly (ethylene glycol)diacrylate allowed detection of temperatures up to 473 K [20].…”

Section: Introductionmentioning

confidence: 99%

“…One of the problems with luminescent thermometers is still the impact of UV radiation on the luminescent properties of lanthanoids in the complex, including at very high temperatures (>450 K) [4,20]. Therefore, the selection of UV and thermally resistant lanthanoid complexes with high temperature sensitivity over a wide temperature range remains relevant.…”

Section: Introductionmentioning

confidence: 99%

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Bimetallic Eu/Tb Complexes for Ratiometric Temperature Sensing with Unusual Enhancement of Eu Luminescence with Temperature

Kharcheva,

Bozhko,

Sokolovskaya

et al. 2023

Photonics

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In this paper we describe the results of the influence of temperature in the range of 280–340 K on the luminescence of bimetallic Eu/Tb complexes with N-heterocyclic ligand L based on 2,2′-bipyridyldicarboxylic acid in acetonitrile. The experiments were carried out for systems with various Eu/Tb ratios. The stability of the complexes of the ligand L with metal M (Eu or Tb) was determined using spectrophotometric titration in acetonitrile solutions. The LM complexes’ stability constants were found to be typical for these systems; however, the stability of Eu complex is slightly higher than that for Tb. Along with rising temperature, we observed a decrease in Tb emission intensity and, at the same time, an enhancement in Eu luminescence. An explanation of Eu luminescence enhancement involves the appearance of charge transfer states, bands of which can be observed in the Eu luminescence excitation spectra as difference spectra measured with two close temperatures. The unusual Eu luminescence enhancement upon heating was observed for the first time for the complex with tetradentate O,N-type heterocyclic diamide ligand L, while an inverse phenomenon was observed with the Tb luminescence. The Eu luminescence enhancement was found earlier for various carboxylate complex salts, but not for heterocyclic coordination complexes. This allows the construction of a ratiometric luminescent thermometer in the range of 280–340 K using the ratio of luminescence intensities for Eu and Tb. The stability constants for the individual Eu and Tb complexes help us to understand the equilibrium in L:Tb:Eu complex system and shed light on plausible speciation in solution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bimetallic Eu/Tb Complexes for Ratiometric Temperature Sensing with Unusual Enhancement of Eu Luminescence with Temperature

Kharcheva,

Bozhko,

Sokolovskaya

et al. 2023

Photonics

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Luminescent Thermometer Systems Dy³⁺/Eu³⁺ and Tb³⁺/Sm³⁺ Based on Coordination Compounds: New Pairs to the Approved Tb³⁺/Eu³⁺?

Zhernakov,

Sedykh,

Denisenko

et al. 2024

Chem. Mater.

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2′,3′-h]-quinoxaline) with good thermal stability up to 446 °C. Statistical substitution of Sm 3+ , Tb 3+ , Gd 3+ , and Dy 3+ with a second Ln 3+ ion led to [Ln 1−x Ln′ x (MeDPQ) 2 Cl 3 ] solid solutions, which exhibit temperature-dependent luminescent properties. Their visible emission and intensity ratios of transitions vary with temperature in the range of 253−353 K. In the case of the composition [Tb 1−x Eu x (MeDPQ) 2 Cl 3 ], the maximum relative thermal sensitivity S r values were determined as 3.77% K −1 , 3.97% K −1 , and 3.97% K −1 for x(Eu 3+ ) = 0.01, 0.05, and 0.1, respectively. The compositions [Dy 1−x Eu x (MeDPQ) 2 Cl 3 ] and [Tb 1−x Sm x (MeDPQ) 2 Cl 3 ] also showed significant performance. For the pair Dy 3+ −Eu 3+ , the S r values were determined as 3.88%K −1 , 3.91% K −1 , and 3.80% K −1 for x(Eu) = 0.01, 0.05, and 0.1, respectively. For the pair Sm 3+ −Tb 3+ , the S r values are 3.28% K −1 and 3.82% K −1 for x(Sm) = 0.9 and 0.1, respectively. The largest thermal sensitivity value S r of 4.11% K −1 was achieved for the composition [Gd 0.8 Tb 0.18 Eu 0.02 (MeDPQ) 2 Cl 3 ]. In addition, patterns of thermometric performance are bound to the energy transfer efficiency Tb 3+ → Eu 3+ , Dy 3+ → Eu 3+ → Dy 3+ , and Tb 3+ → Sm 3+ , as this characteristic is strongly temperature-dependent in the studied range.

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Highly Sensitive and Highly Emissive Luminescent Thermometers for Elevated Temperatures Based on Lanthanide-Doped Polymers

Cited by 2 publications

References 28 publications

Bimetallic Eu/Tb Complexes for Ratiometric Temperature Sensing with Unusual Enhancement of Eu Luminescence with Temperature

Bimetallic Eu/Tb Complexes for Ratiometric Temperature Sensing with Unusual Enhancement of Eu Luminescence with Temperature

Luminescent Thermometer Systems Dy³⁺/Eu³⁺ and Tb³⁺/Sm³⁺ Based on Coordination Compounds: New Pairs to the Approved Tb³⁺/Eu³⁺?

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Highly Sensitive and Highly Emissive Luminescent Thermometers for Elevated Temperatures Based on Lanthanide-Doped Polymers

Cited by 2 publications

References 28 publications

Bimetallic Eu/Tb Complexes for Ratiometric Temperature Sensing with Unusual Enhancement of Eu Luminescence with Temperature

Bimetallic Eu/Tb Complexes for Ratiometric Temperature Sensing with Unusual Enhancement of Eu Luminescence with Temperature

Luminescent Thermometer Systems Dy3+/Eu3+ and Tb3+/Sm3+ Based on Coordination Compounds: New Pairs to the Approved Tb3+/Eu3+?

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Luminescent Thermometer Systems Dy³⁺/Eu³⁺ and Tb³⁺/Sm³⁺ Based on Coordination Compounds: New Pairs to the Approved Tb³⁺/Eu³⁺?