Oxide ancillary ligand-based europium β-diketonate complexes and their enhanced luminosity

Bhagwan, Shri; Dalal, Anuj; Nehra, Kapeesha; Saini, Raman Kumar; Singh, Devender; Simantilleke, Anura Priyajith; Kumar, Sumit; Singh, Ishwar

doi:10.1007/s12598-020-01543-w

Cited by 58 publications

(11 citation statements)

References 29 publications

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“…From absorption spectral data of the complexes, the optical band gap (E g ) can be estimated easily. Tauc's relationship (Equation 1) helps in the estimation of the band gap values of the complexes [ 40,41 ] :

italicαE goodbreak= A {(E - E_{g})}^{m}

where α, E and m represent the absorption coefficient, energy of photons, and optical parameters, respectively. In Tauc's plot a tangent is drawn to the x‐axis that provides the value of E g of the complexes.…”

Section: Resultsmentioning

confidence: 99%

“…The value of A 01 is 50 s −1 . [ 59 ] These transition rates (radiative and nonradiative) were associated with the decay time (τ) using Equation (10) [ 60 ] :

τ goodbreak= {(A_{italicrad} + A_{italicnrad})}^{- 1}

Luminescence quantum efficiency (η) of the complexes was determined from spectroscopic data of europium complexes using Equation (11) [ 61 ] :

η goodbreak= \frac{A_{italicrad}}{A_{rad} + A_{nrad}}

Judd–Ofelt intensity parameters (Ω 2 & Ω 4 ) were affected by alterations in surrounding area near the Eu(III) ion. Usually, Ω 2 gives the information of covalency characteristics and structural area surrounding the Eu(III) ion and Ω 4 relates to the bulk properties of the material.…”

Section: Resultsmentioning

confidence: 99%

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Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

et al. 2022

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Solid ternary europium complexes consisting of fluorinated β‐diketone (thenoyltrifluoroacetone, TTFA) and heteroaromatic bidentate auxiliary ligands were synthesized. The luminescence features of the complexes were estimated using various spectral measurements and clearly proved that the Eu3+ ion is efficiently sensitized by ligands by an antenna effect. Photoluminescence excitation spectra have shown that Eu(III) complexes are excited effectively in the ultraviolet (UV) region and the corresponding emission spectra consist of characteristic peaks attributed to the 5D0→7FJ transitions of the europium ion with the strongest emission peak at 611 nm (5D0→7F2). From photoluminescence (PL) data, decay time, Judd–Ofelt parameters, transition rates, and quantum efficiency of the complexes were also determined. The Commission Internationale de l'éclairage (CIE) colour coordinates indicated the bright red emission of ternary europium complexes. Correlated colour temperature values indicated the utilization of these complexes in display devices. Judd–Ofelt and photophysical parameters were also estimated theoretically using LUMPAC software. Various frontier molecular orbitals and their respective energy were determined. These red emissive europium complexes could be utilized for fabricating solid‐state lighting systems.

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italicαE goodbreak= A {(E - E_{g})}^{m}

Section: Resultsmentioning

confidence: 99%

“…The value of A 01 is 50 s −1 . [ 59 ] These transition rates (radiative and nonradiative) were associated with the decay time (τ) using Equation (10) [ 60 ] :

τ goodbreak= {(A_{italicrad} + A_{italicnrad})}^{- 1}

Luminescence quantum efficiency (η) of the complexes was determined from spectroscopic data of europium complexes using Equation (11) [ 61 ] :

η goodbreak= \frac{A_{italicrad}}{A_{rad} + A_{nrad}}

Section: Resultsmentioning

confidence: 99%

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

et al. 2022

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“…The infrared spectra of β‐diketone complexes have been described in many reports, [ 28,29 ] and their characteristic spectral regions were at 1650–1100 cm −1 wavelengths. The characteristic infrared spectra of NTA and PBTA ligands, NTA/CaF 2 :Er 3+ /Nd 3+ and PBTA/CaF 2 :Er 3+ /Nd 3+ nanoparticles are shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

Enhanced luminescence of CaF₂:Er³⁺/Nd³⁺ nanoparticles coated by fluorinated β‐diketone

Song

Shi

et al. 2020

Luminescence

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In this study, several CaF2 nanoparticles doped with individual ions Nd3+ and Er3+ were synthesized with ligands pentafluorobenzoyl trifluoroacetone (PBTA) and 2‐naphthoyltrifluoroacetone (NTA), which served as modifiers. Influence of the modifiers on the luminescence properties of the nanoparticles was investigated. The as‐prepared nanoparticles had a similar size and dispersion with an irregular spherical shape, which reduced the influence of particle size on the luminescence of the nanoparticles. The luminescence spectra of these nanoparticles showed the characteristic luminescence of the central lanthanide ions under excitation of the maximum excitation wavelength. Compared with nanoparticles modified by the NTA ligand, nanoparticles modified by the PBTA ligand possessed stronger luminescence intensity for the doping Nd3+ or Er3+ ions.

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“…This bidentate 1,10-phenanthroline ligand forms chelates with metal ion which has played a significant role in the fabrication of emanating layer for various display devices [14,15]. We have synthesized series of luminescent complexes with organic chromophores that can be utilized as emitting material in illuminating source [16,17].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and optoelectronic investigations of 3,8-bis(3,4-(ethylenedioxy)thien-2-yl)-1,10-phenanthroline

Nehra

Dalal

Hooda

et al. 2021

J Mater Sci: Mater Electron

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1,10-Phenanthroline-based luminescent materials play an important role as an excellent class of optoelectronic materials due to their remarkable and novel attributes for optoelectronic applications. There is an enormous demand of luminescent materials in many fields. The foremost objective of this paper is to synthesize fluorescent derivatives of 1,10-phenanthroline. The electronic effect of the substituents on the heteroaromatic ligand has been reviewed in solid state. These ligands were characterized by electrochemical study and spectroscopically. The value of energy band gap is estimated to be 3.0-4.5 eV for synthesized compounds. Photophysical features were analyzed through photoluminescence spectrometer, which indicates a strong impact of the substituents on the photoluminescent properties of the phenanthroline ligand. Upon excitation in ultraviolet region, intense broad band appeared in emission spectra of synthesized compounds lie in visible region which is further supported by CIE color coordinates. The detailed explanation about the geometry and frontier molecular orbitals calculation was carried out with the help of Avogadro and ORCA software.

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Oxide ancillary ligand-based europium β-diketonate complexes and their enhanced luminosity

Cited by 58 publications

References 29 publications

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

Enhanced luminescence of CaF₂:Er³⁺/Nd³⁺ nanoparticles coated by fluorinated β‐diketone

Spectroscopic and optoelectronic investigations of 3,8-bis(3,4-(ethylenedioxy)thien-2-yl)-1,10-phenanthroline

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Oxide ancillary ligand-based europium β-diketonate complexes and their enhanced luminosity

Cited by 58 publications

References 29 publications

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

Enhanced luminescence of CaF2:Er3+/Nd3+ nanoparticles coated by fluorinated β‐diketone

Spectroscopic and optoelectronic investigations of 3,8-bis(3,4-(ethylenedioxy)thien-2-yl)-1,10-phenanthroline

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Enhanced luminescence of CaF₂:Er³⁺/Nd³⁺ nanoparticles coated by fluorinated β‐diketone