Charge transfer bands in the Eu3+ luminescence excitation spectra of isomeric europium pyridine-dicarboxylates

Puntus, Lada N.; Zolin, V. F.; Kudryashova, V. A.; Tsaryuk, V. I.; Legendziewicz, J.; Gawryszewska, Paula; Szostak, Roman

doi:10.1134/1.1501333

Cited by 20 publications

(7 citation statements)

References 22 publications

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“…Moreover, the presence of donor and acceptor fragments within a ligand can cause the charge redistribution upon the excitation and leads to intraligand charge transfer (ILCT) state. Such states were observed in the excitation spectra of lanthanide pyridine carboxylates and dicarboxylates [ 21 , 22 , 23 ]. In these complexes, the dependence of frequency of ILCT band as the function of isomer as well as on the coordination manner of carboxylate groups was discovered.…”

Section: Resultsmentioning

confidence: 99%

Diarylphosphate as a New Route for Design of Highly Luminescent Ln Complexes

et al. 2020

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Organophosphate-chloride complexes [{(2,6-iPr2C6H3-O)2POO}2LnCl(CH3OH)4]·2CH3OH, Ln = Nd (1), Eu (2), Gd (3), and Tb (4) have been obtained and structurally characterized. Their reaction with 2,2′:6′,2″-terpyridine leads to the formation of 1:1 adducts ([{(2,6-iPr2C6H3-O)2POO}2LnCl(terpy)(H2O)2(CH3OH)], Ln = Eu (5), Gd (6), Tb (7) with exception of Nd, where tris-diisopropylphenylphosphate complex [{(2,6-iPr2C6H3-O)2POO}3Nd) (terpy)(H2O)(CH3OH)] (8) was obtained due to the ligand metathesis. A bright luminescence observed for the Eu and Tb organophosphate complexes is the first example of an application of organophosphate ligands for 4f-ions luminescence sensitization. Photophysical properties of all complexes were analyzed by optical spectroscopy and an energy transfer scheme was discussed. A combination of two types of ligands into the coordination sphere (phosphate and phenanthroline) allows designing the Eu surrounding with very high intrinsic quantum yield QEuEu (0.92) and highly luminescent Ln complexes for both visible and near-infrared (NIR) regions.

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Section: Resultsmentioning

confidence: 99%

Diarylphosphate as a New Route for Design of Highly Luminescent Ln Complexes

et al. 2020

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“…Thus we can conclude that the variation of the bandgap is mainly caused by lattice shrinkage, rather than the quantum confinement effect. The increase of bandgaps of PeNC host results in a better matching between the excitonic emission band and absorption band of Eu 3+ ions 17 , 28 , which can promote more efficient energy transfer from the PeNC host to Eu 3+ ions. It can be seen that with the introduction of K + ions, the emission peak of the perovskite host shifts from 411 to 400 nm (gray solid line in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Firstly, the EL of Ln 3+ ions originates from the energy transfer process of the perovskite host, which is dominated by the energy matching and the interaction distance between the donor and acceptor. The bandgap of the perovskite host needs to be regulated to match the energy levels of Ln 3+ ions considering the different 4 f electronic configurations according to the Förster-Dexter theory 17 . Secondly, it is well known that the surface state of semiconductor NCs has been the dominant factor in determining the optical and electronic properties of the NCs and their applications 18 .…”

Section: Introductionmentioning

confidence: 99%

Efficient single-component white light emitting diodes enabled by lanthanide ions doped lead halide perovskites via controlling Förster energy transfer and specific defect clearance

et al. 2022

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Currently, a major challenge for metal-halide perovskite light emitting diodes (LEDs) is to achieve stable and efficient white light emission due to halide ion segregation. Herein, we report a promising method to fabricate white perovskite LEDs using lanthanide (Ln3+) ions doped CsPbCl3 perovskite nanocrystals (PeNCs). First, K+ ions are doped into the lattice to tune the perovskite bandgap by partially substituting Cs+ ions, which are well matched to the transition energy of some Ln3+ ions from the ground state to the excited state, thereby greatly improving the Förster energy transfer efficiency from excitons to Ln3+ ions. Then, creatine phosphate (CP), a phospholipid widely found in organisms, serves as a tightly binding surface-capping multi-functional ligand which regulates the film formation and enhances the optical and electrical properties of PeNC film. Consequently, the Eu3+ doped PeNCs based-white LEDs show a peak luminance of 1678 cd m-2 and a maximum external quantum efficiency (EQE) of 5.4%, demonstrating excellent performance among existing white PeNC LEDs from a single chip. Furthermore, the method of bandgap modulation and the defect passivation were generalized to other Ln3+ ions doped perovskite LEDs and successfully obtained improved electroluminescence (EL). This work demonstrates the comprehensive and universal strategies in the realization of highly efficient and stable white LEDs via single-component Ln3+ ions doped PeNCs, which provides an optimal solution for the development of low-cost and simple white perovskite LEDs.

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“…The process of MMCT has an effect on the optical properties of the material . On the one hand, the MMCT emission band may generate in some lanthanide compounds when several conditions are fulfilled, that is the electronic structure of the lanthanide pair and the structural rigidity of the host crystal. , On the other hand, the absorption or excitation spectra of materials may be changed owing to the significant variation in bond length caused by MMCT. ,, Under these circumstances, we realized that there are various factors that have an impact on the degree of MMCT, and the MMCT may change the optical properties greatly owing to the complexity. Therefore, building an ideal system to study the diversity and regularity of MMCT inside polynuclear complexes is significant .…”

Section: Introductionmentioning

confidence: 98%

“…12,13 On the other hand, the absorption or excitation spectra of materials may be changed owing to the significant variation in bond length caused by MMCT. 10,14,15 Under these circumstances, we realized that there are various factors that have an impact on the degree of MMCT, and the MMCT may change the optical properties greatly owing to the complexity. Therefore, building an ideal system to study the diversity and regularity of MMCT inside polynuclear complexes is significant.…”

Section: Introductionmentioning

confidence: 99%

Observation of Strong Electron Coupling among Trivalent Lanthanide Ions in Molecular Cluster-Aggregates

Nan,

Jiang,

Shi

et al. 2023

J. Phys. Chem. C

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Lanthanide-based nanomaterials have been extensively studied, owing to their unique optical properties. Strong electron coupling intensely affects the optical properties, as a kind of interaction between the metal luminescence centers, which usually depend on the otherness in valence states and/or spin states of metal ions. Herein, we presented that the strong electron coupling between trivalent lanthanide ions (Ln III ) existed in molecular cluster-aggregates (MCAs) beyond the general consideration in valence and/or spin states. We synthesized a series of lanthanide-based MCAs with the generalized formula [Ln 20 -(chp) 30 (CO 3 ) 12 (NO 3 ) 6 (H 2 O) 6 ] ({Ln 20 }). By comparing and analyzing the characteristics of homometallic and heterometallic {Ln 20 } MCAs, we found a regular and controlled phenomenon of metal-to-metal charge transfer (MMCT) which is a typical expression of strong electron coupling. This observation can be attributed to the shorter spacing between metals inside the polynuclear nanosized core of MCAs, indicating that MCAs are an excellent matrix material to study the effects of intermetallic interactions of Ln III , thus tailoring even customization in their luminescence performance.

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Charge transfer bands in the Eu3+ luminescence excitation spectra of isomeric europium pyridine-dicarboxylates

Cited by 20 publications

References 22 publications

Diarylphosphate as a New Route for Design of Highly Luminescent Ln Complexes

Diarylphosphate as a New Route for Design of Highly Luminescent Ln Complexes

Efficient single-component white light emitting diodes enabled by lanthanide ions doped lead halide perovskites via controlling Förster energy transfer and specific defect clearance

Observation of Strong Electron Coupling among Trivalent Lanthanide Ions in Molecular Cluster-Aggregates

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