Optical properties of red, green and blue emitting rare earth benzenetricarboxylate compounds

Souza, Ernesto Rezende; Silva, Ivan G.N.; Teotonio, Ercules E.S.; Felinto, M.C.F.C.; Brito, Hermi F.

doi:10.1016/j.jlumin.2009.09.004

Cited by 65 publications

(6 citation statements)

References 42 publications

(49 reference statements)

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“…The excitation spectra (Figure 4) of all samples were monitored at the hypersensitive transition (Eu 3+ ) 5 D 0 → 7 F 2 (611 nm). The broad higher energy bands are assigned to transitions S 0 → S n on the ligands [23][24][25], evidencing the ligand-to-Eu 3+ energy transfer. In LDH-ACAC, the excitation band of the ligand has a pronounced overlap with the f-f absorption/emission bands resulting from intraconfigurational transitions of Eu 3+ observed between 300 and 430 nm, most markedly 7 F 0,1 → 5 L 6-10 .In this sample, the excitation band of the ligand is less intense than direct excitation of the (Eu 3+ ) 7 F 0,1 → 5 L 6-10 Laporte forbidden transitions, indicating that the photosensitization effect is not efficient in this sample.…”

Section: Figure 2 Here Figure 3 Herementioning

confidence: 92%

Enhanced luminescence in ZnAlEu layered double hydroxides with interlamellar carboxylate and β-diketone ligands

Morais

Machado

Teixeira

et al. 2019

Journal of Alloys and Compounds

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The physico-chemical properties of layered double hydroxides (LDHs) can be tailored to a large extent by exploiting the flexibility of their chemical composition. This report describes the synthesis and the detailed quantitative characterization of the luminescence properties of novel Eu 3+ -containing LDHs intercalated by carboxylate and β-diketonate anionic ligands. To prepare the samples, Zn 2+ , Al 3+ and Eu 3+ were coprecipitated in a ligand-rich solution containing 1,3,5benzenetricarboxylate (BTC), acetylacetonate (ACAC), and thenoyltrifluoroacetonate (TTA).Powder X-ray diffraction is supportive for the intercalation of BTC and ACAC. The presence of TTA is revealed by CHN quantification and by the photoluminescence results. Detailed spectroscopic investigation of these materials demonstrates quantum efficiencies (η) of 15 to 17% emerging from the symmetry reduction engendered by the organic ligands in the vicinity of

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Section: Figure 2 Here Figure 3 Herementioning

confidence: 92%

Enhanced luminescence in ZnAlEu layered double hydroxides with interlamellar carboxylate and β-diketone ligands

Morais

Machado

Teixeira

et al. 2019

Journal of Alloys and Compounds

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“…For PBIA–Eu , these bands are centered at 384 ( 7 F 0 → 5 G 2–6 ), 394 ( 7 F 0 → 5 L 6 ), 415 ( 7 F 1 → 5 D 3 ), 464 ( 7 F 0 → 5 D 2 ), 525 ( 7 F 0 → 5 D 1 ), and 535 nm ( 7 F 1 → 5 D 1 ). For PBIA–Eu ACT , they are centered at 384 ( 7 F 0 → 5 G 2–6 ), 393 ( 7 F 0 → 5 L 6 ), 415 ( 7 F 1 → 5 D 3 ), 465 ( 7 F 0 → 5 D 2 ), 525 ( 7 F 0 → 5 D 1 ), and 534 nm ( 7 F 1 → 5 D 1 ). ,− This suggests that, in both Eu compounds, their luminescence sensitization was observed to be inefficient via ligand excitation. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…The PBIA–Tb ACT excitation spectrum displays the bands attributed to the f–f transitions from the 7 F 6 ground state and are stronger than in those in the PBIA–Tb compound. These bands are centered at 351 ( 7 F 6 → 5 L 9 ), 358 ( 7 F 6 → 5 G 5 ; 7 F 6 → 5 D 2 ), 371 ( 7 F 6 → 5 L 10 ), and 377 nm ( 7 F 6 → 5 G 6 ; 7 F 6 → 5 D 3 ). ,− In contrast to Eu compounds, excitation through the ligand in Tb compounds is more efficient, although PBIA–Tb ACT compound could also be directly excited into the Tb 3+ ion.…”

Section: Results and Discussionmentioning

confidence: 99%

New 2D Lanthanide MOFs Constructed from Bis(imide) Pyromellitic Alanine Ligands with Enhanced Fluorescence toward Activation and Modulation of Microstructure

Chávez¹,

Nájera²,

Leyva

et al. 2020

Crystal Growth & Design

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Five isostructural 2D lanthanide (Ln) MOFs were synthesized using 2,2′-(1,3,5,7-tetraoxo-5,7-dihydropyrrolo[3,4-f]isoindole-2,6(1H,3H)-diyl)dipropionic acid (PBIA ligand) semiflexible ligand and Pr/Eu/Tb/Er/Tm hydrated nitrates in DMF leading to PBIA–Pr/PBIA–Eu/PBIA–Tb/PBIA–Er/PBIA–Tm materials. New MOFs were characterized employing Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), single crystal and powder X-ray diffractions (SCXRD/PXRD), photoluminescence, and scanning electron microscopy (SEM). MOFs crystallized in P1̅ triclinic space group, developing 2D structures through different ligand coordination-conformation schemes toward dinuclear Ln–metal clusters (SBU). Materials were thermally stable ca. 400 °C, being activated partially removing DMF → Ln molecules giving PBIA–Pr ACT /PBIA–Eu ACT /PBIA–Tb ACT /PBIA–Er ACT /PBIA–Tm ACT phases reorganizing the PBIA ligand toward isobidentate mode, releasing ca. two of six-coordinated DMF per SBU. Just Eu/Tb materials could be studied in the 200–800 nm range showing characteristic emission bands, and the PBIA ligand was not sensitization-suitable for other Ln emissions. Band shape modification and emission intensity enhancement of 6.7(Eu) and 30.6(Tb) resulted in Eu/Tb-activated compounds. Excitation of PBIA–Eu/PBIA–Eu ACT directly in Eu3+ resulted efficient, but not via the PBIA ligand. In PBIA–Tb/PBIA–Tb ACT compounds, PBIA ligand excitation is more efficient and PBIA–Tb ACT could be directly excited in Tb3+. Hence nonradiative processes are playing decisive roles in luminescent properties. Isostructural materials resulted, but different Ln-metals provided different morphologies/sizes, modulating microstructures, and luminescence properties. These materials would be candidates for molecular/ionic sensing, through emission modulation, mainly when Eu and Tb are employed as Ln.

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“…The Ω 4 parameter values present very similar values, indicating, to similar bond distances between the metal ion and the ligating atoms from the ligands. When we compare the Ω 4 parameter values of the flufenamate systems with other Eu 3+ carboxylate complexes , obtained at room temperature, the former present lower values, indicating a less sensitivity to the distances and, therefore, to covalency effects. , This behavior is probably due to variations in the distance between a ligating Eu 3+ atom, though angular variation in the first coordination sphere may also contribute to this very fact.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

Assunção

Costa

Santos

et al. 2022

ACS Appl. Opt. Mater.

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The design of efficient luminescent lanthanide materials with a wide range of different excitation wavelengths in the UVA, UVB, and UVC regions, as well as under sunlight exposure, is highly desirable for application as molecular light-converting devices. In this work, [Ln(fluf)3(L)] complexes (Ln3+: Eu, Gd, and Tb) and doped PMMA:(1%)Tb(fluf)3(L) films, where fluf stands for the flufenamate ligand and L is H2O, phen, tppo, topo, and dpso, were successfully prepared by a facile one-pot method, and their photophysical properties were also investigated. The Ln3+ compounds were characterized by elemental analysis, Fourier transform infrared absorption spectroscopy, thermogravimetric analysis, X-ray powder diffraction, and diffuse reflectance spectroscopy techniques. The Eu3+ complexes present very weak emission intensities at 300 K temperature, showing very low intrinsic quantum yield (Q Eu Eu) values due to a highly operative luminescence quenching by a low-lying ligand to metal charge transfer state. However, these values are significantly increased when obtained at low temperature (77 K). For Tb3+ complexes and the doped PMMA, polymeric films revealed an unprecedented bright emission under excitation at UVA, UVB, and UVC radiation. In addition, the doped polymers under sunlight exposure show the characteristic 5D4 → 7F6–0 transitions of the Tb3+ ion, exhibiting green emission color. These luminescent doped polymeric materials act as efficient energy harvesters and converters. Hence, the optical results show that the PMMA:(1%)Tb(fluf)3(L) photonic materials are highly versatile and desirable, presenting suitable application as efficient light-converting molecular devices and as luminescent solar concentrators.

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Optical properties of red, green and blue emitting rare earth benzenetricarboxylate compounds

Cited by 65 publications

References 42 publications

Enhanced luminescence in ZnAlEu layered double hydroxides with interlamellar carboxylate and β-diketone ligands

Enhanced luminescence in ZnAlEu layered double hydroxides with interlamellar carboxylate and β-diketone ligands

New 2D Lanthanide MOFs Constructed from Bis(imide) Pyromellitic Alanine Ligands with Enhanced Fluorescence toward Activation and Modulation of Microstructure

Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

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Optical properties of red, green and blue emitting rare earth benzenetricarboxylate compounds

Cited by 65 publications

References 42 publications

Enhanced luminescence in ZnAlEu layered double hydroxides with interlamellar carboxylate and β-diketone ligands

Enhanced luminescence in ZnAlEu layered double hydroxides with interlamellar carboxylate and β-diketone ligands

New 2D Lanthanide MOFs Constructed from Bis(imide) Pyromellitic Alanine Ligands with Enhanced Fluorescence toward Activation and Modulation of Microstructure

Luminescent Analysis of Eu3+ and Tb3+ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure

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Luminescent Analysis of Eu³⁺ and Tb³⁺ Flufenamate Complexes Doped in PMMA Polymer: Unexpected Terbium Green Emission under Sunlight Exposure