Judd-Ofelt analysis of some novel Eu3+ complexes featuring Kojic acid and N, N’- donor ligands

Langyan, Ritu; Chauhan, Archana; Lohra, Sheetal; Dhania, Shammy Laj

doi:10.1016/j.jphotochem.2020.112752

Cited by 17 publications

(3 citation statements)

References 49 publications

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“…The obtained quantum efficiency for ternary complexes Eu2-Eu6 is found to be 20.88%-38.40% which is outcome of the synergistic impact of auxillary ligand along with smaller non-radiative decay. The quantum efficiency of present complexes is cognate with the results published for other Eu(III) complexes by Devi et al (14.6%-32.4%) [43], Nandal et al (14.9%-34.43%) [35], Bala et al (8.89%-42.56%) [44] but lesser than those reported by Langyan et al (60.72%-71.46%) [45].…”

Section: Luminescence Lifetime and Quantum Efficiencysupporting

confidence: 90%

“…It has been firmly established now that any light source with CCT<3200 K is a warm light source. The CCT of complexes obtained from equation (13) lies between 1628.32-1906.94 K, so the complexes can have utility as warm light source in restaurants, lounges and home appliances [66] and the results are well harmonious with the previously published reports [19,45]. Another pivotal parameter -u' v' coordinates were also obtained via following formula employing CIE coordinates (x, y) [66]:…”

Section: Chromaticity Analysissupporting

confidence: 67%

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Photophysical, optical and lasing analysis of fluorinated β-keto carboxylate europium(III) complexes

Khatri¹,

Ahlawat²,

Khatkar³

et al. 2022

Methods Appl. Fluoresc.

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Six luminescent, bright red Eu(III) complexes with a β-keto-carboxylic acid as prime ligand and N-donor aromatic systems as auxillary ligand were synthesised via ecologically efficient grinding method. The distinctive red peak (5D0 → 7F2) of Eu(III) ion is exhibited in emission spectra of all complexes. The luminescent properties of complexes were analysed through decay time, color coordinates, luminescence efficiency and Judd Ofelt parameters. The value of Ω2 is found to be higher than Ω4 which indicated hypersensitive nature of 5D0 → 7F2 transition. The results established the complexes as a strong contender for red light emitting display devices. The fluorescence branching ratios, stimulated emission cross section, gain band width and optical gain showed the good lasing strength of 5D0 → 7F2 transition of complexes. The complexes exhibited decent thermal stability and have optical energy band gap value in semiconductor range, thus can have relevance in optoelectronic devices. Energy transfer mechanism was investigated for complexes which affirmed the efficacious transfer of energy from ligands to Eu(III) ion. The synthesised complexes were also assayed for antimicrobial and antioxidant properties. All complexes are reported to show better antioxidant behaviour than the prime ligand and also exhibited upstanding antibacterial activities.

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Section: Luminescence Lifetime and Quantum Efficiencysupporting

confidence: 90%

Section: Chromaticity Analysissupporting

confidence: 67%

Photophysical, optical and lasing analysis of fluorinated β-keto carboxylate europium(III) complexes

Khatri¹,

Ahlawat²,

Khatkar³

et al. 2022

Methods Appl. Fluoresc.

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“…Fluorescent materials based on lanthanide (Ln 3+ ) complexes [ 4 , 5 , 6 , 7 ] exhibit sharp emission peaks and high fluorescence intensity compared with traditional fluorescent organic molecules. The advantages of distinctive emission spectra and photostability of Ln 3+ fluorescence nanomaterials make them suitable for biological applications [ 7 ], with the background of the widely investigated luminescence properties of Ln 3+ complexes [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Stable Fluorescence of Eu3+ Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition

et al. 2021

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We designed and realized highly fluorescent nanostructures composed of Eu3+ complexes under a protein coating. The nanostructured material, confirmed by photo-induced force microscopy (PiFM), includes a bottom fluorescent layer and an upper protein layer. The bottom fluorescent layer includes Eu3+ that is coordinated by 1,10-phenanthroline (Phen) and oleic acid (O). The complete complexes (OEu3+Phen) formed higher-order structures with diameter 40–150 nm. Distinctive nanoscale striations reminiscent of fingerprints were observed with a high-resolution transmission electron microscope (HRTEM). Stable fluorescence was increased by the addition of Eu3+ coordinated by Phen and 2-thenoyltrifluoroacetone (TTA), and confirmed by fluorescence spectroscopy. A satisfactory result was the observation of red Eu3+ complex emission through a protein coating layer with a fluorescence microscope. Lanthanide nanostructures of these types might ultimately prove useful for biometric applications in the context of human and non-human tissues. The significant innovations of this work include: (1) the structural set-up of the fluorescence image embedded under protein “skin”; and (2) dual confirmations of nanotopography and unique nanofingerprints under PiFM and under TEM, respectively.

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Preparation and optical features of samarium(III) complexes introducing bidentate fluorinate and secondary ligands

Chauhan

Langyan

2020

J Mater Sci: Mater Electron

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Judd-Ofelt analysis of some novel Eu3+ complexes featuring Kojic acid and N, N’- donor ligands

Cited by 17 publications

References 49 publications

Photophysical, optical and lasing analysis of fluorinated β-keto carboxylate europium(III) complexes

Photophysical, optical and lasing analysis of fluorinated β-keto carboxylate europium(III) complexes

Stable Fluorescence of Eu3+ Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition

Preparation and optical features of samarium(III) complexes introducing bidentate fluorinate and secondary ligands

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