Luminescence properties of lanthanide tetrakis complexes as molecular light emitters

The influence of different cations on the structure and spectral properties of Ln3+ tetrakis-complexes with the CAPh-type ligand dimethyl-N-trichloroacetylamidophosphate

“…From the emission spectra of the Eu 3+ compounds, we can obtain the experimental intensity parameters through the integrated intensity of the 5 D 0 → 7 F 1 ( I 0→1 ) and 5 D 0 → 7 F λ ( I 0→ λ ), with λ = 2 and 4, emissions: 29 where ħ is the reduced Planck's constant, e is the elementary charge, and σ 0→ λ is the centroid of 5 D 0 → 7 F λ in wavenumbers ( σ 0→2 ∼ 16 200 cm −1 and σ 0→4 ∼ 14 290 cm −1 ). The 〈 7 F λ ‖ U ( λ ) ‖ 5 D 0 〉 2 term represents the square of the reduced matrix elements of the tensor operator of rank λ .…”

“…44,45 The A MD 0→1 represents the radiative rate (spontaneous emission) of the 5 D 0 → 7 F 1 transition and can be estimated by A MD 0→1 ≈ A MD 0→1 (vac) n r 3 , with A MD 0→1 (vac) = 14.92 s −1 being the spontaneous emission rate for the 5 D 0 → 7 F 1 in vacuum. 29,46 For n r = 1.5, A MD 0→1 assumes a value of approximately 50 s −1 .…”

“…In several studies devoted to Ln 3+ tetrakis-β-diketonates it was shown that the nature of cations in these compounds can influence the lifetime and quantum efficiency of the Ln 3+ emission. 25–30 This may be related to the probability of non-radiative deactivation of the compound's excited state which depends, among other things, on the rigidness of the structure of the complex. The point symmetry around the Ln 3+ can be disturbed by the interaction between the lateral groups of the ligands and the counterion.…”

Luminescent Ln3+-based silsesquioxanes with a β-diketonate antenna ligand: toward the design of efficient temperature sensors

“…Luminescent coordination complexes containing trivalent lanthanide ions (Ln 3+ ) have attracted significant attention over several decades due to tremendous perspectives in different applications, including bioimaging and biosensing ( Eliseeva and Bünzli, 2009 ; Ning et al, 2019 ), light-emitting technology ( Bünzli, 2019 ; Costa et al, 2024 ), smart windows ( Choi et al, 2017 ; Fernandes et al, 2018 ; Costa et al, 2024 ), nano-thermometry ( Allison, 2019 ; Brites et al, 2019 ; Brites et al, 2023 ), detection of molecules and ions ( Eliseeva and Bünzli, 2009 ; Allison, 2019 ; Brites et al, 2023 ), cell labeling ( Aulsebrook et al, 2018 ; Bodman and Butler, 2021 ). These compounds exhibit distinctive photophysical characteristics, manifesting as prolonged emission with lifetimes extending up to milliseconds.…”

Hourglass-Shaped Homo- and Heteronuclear Nonanuclear Lanthanide Clusters: Structures, Magnetism, Photoluminescence, and Theoretical Analysis

“…Lanthanide (Ln) molecular complexes have gained significant interest across a wide range of disciplines, which include catalysis, magnetic resonance imaging, luminescent materials, multimodal imaging probes, single-molecule magnets (SMMs), − and quantum information processing (QIP) . Over the last few decades, numerous Ln-based clusters have been reported, with nuclearities such as Ln 3 , Ln 4 , , Ln 5 , − Ln 6 , Ln 8 , Ln 9 , ,, Ln 10 , Ln 12 , Ln 16 , Ln 19 , Ln 36 , Ln 48 , , Ln 104 , etc.…”