Photoluminescent report on red light emitting europium(III) complexes with heterocyclic acid

Dhankhar, Priyanka; Bedi, Manisha; Khanagwal, Jyoti; Taxak, V.B.; Khatkar, S.P.; Doon, Priti Boora

doi:10.1080/00387010.2020.1736099

Cited by 21 publications

(11 citation statements)

References 45 publications

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“…The emission intensity in C1 complex is diminished by O‐H oscillators of water molecules, which quench the excited states of Tb 3+ ion and suppress the radiative decay process. [ 36 ] Moreover, the emission intensity of these complexes are enhanced by better matching of energy gap between triplet state (22,523 cm −1 ) of HEAP ligand and resonating level (20,408 cm −1 ) and found to be more prominent than other reported complexes. There exists a large energy gap between triplet state of ligand and resonating level of Tb 3+ ion, which declines the luminosity of complexes as reported by Bala et al and Wang et al [ 22,37 ]…”

Section: Resultsmentioning

confidence: 84%

“…Further, the complexes C3 and C4 possess similar structural framework of dmph and phen ancillary ligands but the luminous intensity of C3 complex is repressed by vibronic quenching produced by extra C‐H bonds of methyl groups in dmph ancillary ligand. [ 36 ] The mechanism of energy transfer through various energy migration aisles for complex C5 is pictured in Figure 10.…”

Section: Energy Transfer Dynamicsmentioning

confidence: 99%

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Photoluminescence performance of green light emitting terbium (III) complexes with β‐hydroxy ketone and nitrogen donor ancillary ligands

et al. 2021

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An efficient and cost‐effective technique, solution precipitation approach is adopted to synthesize five bright green luminescent terbium (III) complexes by employing the main β‐hydroxy ketone ligand, 2‐hydroxy‐4‐ethoxyacetophenone, and ancillary ligands like bathophenanthroline, 5,6‐dimethyl‐1,10‐phenanthroline, 1,10‐phenanthroline, and 2,2‐bipyridyl. The elemental compositions and binding mode of ligand to terbium (III) ion can be validated by using energy dispersive X‐ray analysis, elemental analysis, Fourier transform infrared, and proton nuclear magnetic resonance spectroscopy. The complexes are thermally stable up to 158°C and possess the cubic shaped particles as confirmed by thermogravimetric analysis and scanning electron microscopic study, respectively. The band‐gap energy (3.02–2.92 eV) of complexes is reckoned through diffuse reflectance spectra, which tailors them as potential candidates in the field of military radars. The photoluminescence studies unveil that the complexes exhibit the bright green luminescence corresponding to 5D4 → 7F5 transition of Tb3+ ion (548 nm) under the excitation wavelength of 395 or 397 nm. The Commission International de I’Eclairage chromaticity coordinates (x, y) and color purity substantiates the green emission of complexes. The energy transfer mechanism elucidates that the main ligand and ancillary ligands sensitize Tb3+ ion, which in turn enhances the luminescence efficiency of the emissive layer of white organic light emitting diodes. The results reveal that the complexes are considered as good contenders in the field of display devices and laser technology. Lastly, in vitro antimicrobial and antioxidant activity proclaim the potent antimicrobial and antioxidant actions of complexes via tube dilution and 2, 2‐diphenyl‐1‐picrylhydrazyl assays, respectively.

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Section: Resultsmentioning

confidence: 84%

Section: Energy Transfer Dynamicsmentioning

confidence: 99%

Photoluminescence performance of green light emitting terbium (III) complexes with β‐hydroxy ketone and nitrogen donor ancillary ligands

et al. 2021

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“…The overall energy transfer process involved various electron levels, both from metal ions and ligand, but the triplet state of ligand is practically the major actor in the energy migration process. [ 39 ] To explore the intramolecular energy transfer process, the excited singlet and triplet states of the ligand were calculated from the UV spectra of the ligand by considering its edge wavelength and the lower emission wavelength data of the phosphorescence spectrum of Gd (PFA) 3 (H 2 O) 2 (Figure 11), which were found to be 28,169 cm −1 and 24,630 cm −1 , respectively. The estimated values of singlet (S 0 ) and triplet (T 1 ) states of bipyridyl, phen, and batho were in good correlation with the values previously reported in the literature.…”

Section: Resultsmentioning

confidence: 99%

Investigations into spectroscopic and optoelectronic behaviour of furoic acid‐based Eu(III) complexes for advanced photonic applications

et al. 2022

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To illuminate the zone of organic light-emitting diodes, a novel series of four red luminescent europium complexes, one binary (C1) and three ternary (C2-C4), of 5-phenyl 2-furoic acid was synthesized with 2,2 0 -bipyridyl (bipy), bathophenanthroline (batho) and 1,10-phenanthroline (phen) as ancillary ligands and characterized by adopting various analytical techniques. All the findings of energydispersive X-ray spectroscopy, elemental (CHN) analysis, Fourier transform infrared, nuclear magnetic resonance, and ultraviolet-visible spectroscopy confirmed the coordination of ligand binding sites with the europium ion. To evaluate the thermal stability, thermogravimetric/difference thermogravimetric measurements were taken that revealed that the synthesized complexes were stable up to 245 C. Diffused reflectance studies indicated that these complexes had potential for their use in wide band-gap semiconductors, as all the four complexes showed metal-centred luminescence as a characteristic red emission peak that was observed at 613 nm under the excitation wavelength of 330 nm. The internal quantum efficiencies and luminescence lifetime of complexes were predicted using Judd-Ofelt and photophysical data. The monoexponential luminescence decay and Judd-Ofelt analysis suggested the presence of a single and asymmetric chemical environment in the coordination sphere of the europium metal. Commission International de l'Eclairage colour coordinates, correlated colour temperature values, and colour purity of the complexes validated their red emission in the visible region.

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“…Table V clearly indicates the upsurging of decay lifetime from binary complex to ternary complexes due to encapsulation of secondary ligands in the coordination framework of ternary complexes, which suppresses the non-radiative deactivation process caused by vibronic quenching mediated with hydroxyl groups of water molecules in the binary complex. 44…”

Section: Tmentioning

confidence: 99%

“…This is due to the presence of extra -CH 3 groups in the dmph secondary ligand, which produces vibronic quenching (due to vibrations of extra C-H bonds) resulting in lower luminosity of the C3 complex than the C4 complex. 44 The systematic energy transfer mechanism of the C5 complex is shown in Fig. 8.…”

Section: Photosensitized Energy Transfer Mechanismmentioning

confidence: 99%

Enhanced Optoelectronic and Biological Potential of Virescent-Glowing Terbium(III) Complexes with Pyrazole Acid

Khanagwal

Kumar

Bedi

et al. 2021

Journal of Elec Materi

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A series of five virescent color emitting terbium(III) complexes is fabricated by a cost-effective and eco-friendly solution precipitation technique with the utilization of 1-(4-methoxyphenyl)-5-(trifluoromethyl)-1H-pyrazole-4-carboxylic acid (L) as a primary ligand and highly conjugated nitrogen donor secondary ligands such as bathophenanthroline (batho), 5,6-dimethyl-1,10phenanthroline (dmph), 1,10-phenanthroline (phen) and 2,2-bipyridyl (bipy). The elemental compositions of complexes are examined through energy dispersive x-ray and elemental analyses, whilst the binding nature of ligand with terbium(III) ion is confirmed using proton nuclear magnetic resonance and infrared spectroscopy. The band gap energy (E g ) of complexes is found in the range of 3.85-3.34 eV as evaluated from diffuse reflectance spectral data. The significant thermal stability of these luminescent materials (157°C) demonstrates their key role as virescent component in white organic light emitting diodes. The intense emission and decay time of complexes are explored through photoluminescent study. The good color purity and Commission International De I'Eclairage color coordinates promise the enhanced performance of these materials in lighting appliances. The sensitization phenomenon highlights the role of ligands in increasing the luminescence intensity of complexes. The biological assessment indicates that the complexes are potent antimicrobial and antioxidant agents. The aforementioned features extend the field of applications of complexes in laser technology and optoelectronic devices.

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Photoluminescent report on red light emitting europium(III) complexes with heterocyclic acid

Cited by 21 publications

References 45 publications

Photoluminescence performance of green light emitting terbium (III) complexes with β‐hydroxy ketone and nitrogen donor ancillary ligands

Photoluminescence performance of green light emitting terbium (III) complexes with β‐hydroxy ketone and nitrogen donor ancillary ligands

Investigations into spectroscopic and optoelectronic behaviour of furoic acid‐based Eu(III) complexes for advanced photonic applications

Enhanced Optoelectronic and Biological Potential of Virescent-Glowing Terbium(III) Complexes with Pyrazole Acid

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