Highly luminescent pure-red-emitting fluorinated β-diketonate europium(III) complex for full solution-processed OLEDs

Martins, João Pedro; Martín-Ramos, Pablo; Coya, Carmen; Silva, Manuela Ramos; Eusébio, M. Ermelinda S.; Andrés, A. de; Álvarez, Antonio García; Martín‐Gil, Jesús

doi:10.1016/j.jlumin.2014.10.020

Cited by 46 publications

(16 citation statements)

References 59 publications

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“…The observed emission line at λ ≈ 580 nm (single peak) for the 5 D 0 – 7 F 0 transition indicates that all Eu 3+ ions in the structure occupy a site of the same symmetry and experience similar crystal‐field perturbation. The emission lines at λ ≈ 580 and 652 nm are weak, and their corresponding 5 D 0 → 7 F 0 and 5 D 0 → 7 F 3 transitions are forbidden both in magnetic‐ and electric‐dipole systems . When the Eu ion occupies the center of a symmetric site, the emission intensity of the magnetic‐dipole (MD) transition ( 5 D 0 → 7 F 1 ) is independent of the coordination environment.…”

Section: Resultsmentioning

confidence: 99%

A Dual‐Characteristic Bidentate Ligand for a Ternary Mononuclear Europium(III) Molecular Complex – Synthesis, Photophysical, Electrochemical, and Theoretical Study

et al. 2016

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The new bipolar ligand 4‐{1‐(9,9‐diethyl‐9H‐fluoren‐2‐yl)‐1H‐imidazo[4,5‐f][1,10]phenanthrolin‐2‐yl}‐N,N‐diphenylbenzenamine (Phen‐Fl‐TPA) and its β‐diketonate EuIII complex have been designed, synthesized, characterized, and their photophysical and electrochemical properties have been investigated. The UV/Vis absorption and photoluminescence (PL) emission spectra of the Eu complex and Phen‐Fl‐TPA in solution as well as in the solid state and as thin films were recorded. The PL study indicated that the Eu complex emits narrow‐band red emission with an appropriate International Commission on Illumination (CIE) color gamut. Moreover, it also confirmed the efficient energy transfer from the ligand to the Eu3+ ion. Time‐dependent DFT (TD‐DFT) calculations were performed for the ligand to determine the exact positions of the excited singlet and triplet energy levels. The EuIII complex shows a dominant pathway involving energy transfer between the ligand triplet level and the excited (5D0) level of the EuIII ion. In addition, the theoretically calculated UV/Vis spectrum of the ligand is similar to the experimental one. The Judd–Ofelt theory was applied to the emissive properties of the EuIII complex, and the lifetime was found to be 0.66 ms. The ground‐state optimized ligand structure was a good match with the single‐crystal structure. The photoluminescence quantum yield (PLQY) of Eu(TTA)3Phen‐Fl‐TPA (TTA = thenoyltrifluoroacetone) in solution was 34.1 %, and it possess a high thermal decomposition temperature (317 °C), as determined by differential scanning calorimetry/thermogravimetric analysis (DSC‐TGA). Electrochemical analysis revealed highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels for the EuIII complex of 5.6 and 2.8 eV, respectively.

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Section: Resultsmentioning

confidence: 99%

A Dual‐Characteristic Bidentate Ligand for a Ternary Mononuclear Europium(III) Molecular Complex – Synthesis, Photophysical, Electrochemical, and Theoretical Study

et al. 2016

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“…Among these, europium (III) complexes with β-diketones possessing aromatics and fluorine substituents displayed very good to excellent photo luminescent properties. Thus, various europium (III) complexes with β-diketones were synthesized and evaluated for their photo luminescent properties [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Syntheses, Crystal Structure and Luminescence Properties of Cone-Like Octadentate Europium (III) Complexes with Four Short Alkoxy Substituents

et al. 2017

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Treatment of 1-(4 -methoxy or ethoxy phenyl)-4,4,4-trifluoro-1,3-butanedione with europium (III) chloride in the presence of piperidine resulted in the halide ligands exchange yielded new piperidinium tetrakis{1-(4 -methoxy or ethoxy phenyl)-4,4,4-trifluoro-1,3-butanedionato} europate (III) complexes 2a and 2b. Complexes 2a and 2b have been characterized by elemental analysis, 1 H NMR spectroscopy, and FAB-MS, and their absolute structures were determined by single crystal X-ray diffraction analysis. The complexes 2a and 2b have the monoclinic space groups C2/c (No. 15, 4 -substituent = OCH 3 ) and with P − 1 (No. 2, 4 -substituent = OC 2 H 5 ), respectively. X-ray analysis results showed that eight coordinate structures of the complexes 2a and 2b have cone-like structures, like calix [4]arenes, but their structures were slightly different due to the crystal packing and the existence of the solvent molecule. The complexes 2a and 2b exhibited identical, strong photoluminescence emissions in the solution phase.

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“…Among these, Europium (III) complexes with β-diketones possessing aromatics substituents displayed very good to excellent photo luminescent properties. Thus, various Europium (III) complexes with β-diketones were synthesized and evaluated for their photo luminescent prop- [12].…”

Section: Introductionmentioning

confidence: 99%

Syntheses, Crystal Structure and Photoluminescence Properties of Piperidinium Tetrakis (1,3-Diphenyl-1,3-Propanedionato) Europate(III) Complex and Its Two Different Crystals

Moriguchi¹,

Kitou²,

Yakeya³

et al. 2017

CSTA

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Treatment of 1,3-diphenyl-1,3-propanedione 1a with europium (III) chloride in the presence of piperidine results in the halide ligands exchange giving newly piperidinium tetrakis (1,3-diphenyl-1,3-propanedionato)europate(III) complex 2a. The complex was characterized by 1 H-NMR, positive FAB-mass, and Elemental Analysis. The exact molecular structure of 2a was determined by single crystal X-ray diffraction with the monoclinic space group Cc (centrosymmetric, No.13). The large cavity sizes of the complex 2a facilitated the inclusion of water and benzene solvate molecules. The other two different crystals 2b, 2c having two water molecules and one benzene molecule were obtained by the crystallization in different solvents and the exact molecular structures were determined by single crystal X-ray diffraction analysis with space groups P2 1 /n (centrosymmetric, No.14), and P2 1 /n (centrosymmetric, No.14), respectively. The eight coordinate structures of the complexes in the three crystals were slightly different due to the crystal packing and the existence of the solvent molecule(s). The photoluminescence studies indicated that four β-diketone ligands acted as strong antenna ligands and transferred the absorbed energy to europium (III) ion, consequently red luminescence was observed. These strong emissions were attributed to the

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Highly luminescent pure-red-emitting fluorinated β-diketonate europium(III) complex for full solution-processed OLEDs

Cited by 46 publications

References 59 publications

A Dual‐Characteristic Bidentate Ligand for a Ternary Mononuclear Europium(III) Molecular Complex – Synthesis, Photophysical, Electrochemical, and Theoretical Study

A Dual‐Characteristic Bidentate Ligand for a Ternary Mononuclear Europium(III) Molecular Complex – Synthesis, Photophysical, Electrochemical, and Theoretical Study

The Syntheses, Crystal Structure and Luminescence Properties of Cone-Like Octadentate Europium (III) Complexes with Four Short Alkoxy Substituents

Syntheses, Crystal Structure and Photoluminescence Properties of Piperidinium Tetrakis (1,3-Diphenyl-1,3-Propanedionato) Europate(III) Complex and Its Two Different Crystals

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