Radiative and non-radiative characteristics of Ca9Bi(PO4)7:Eu3+ nano-phosphor for solid state lighting devices

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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“…These results endorse the promising applications of terbium (III) complexes in advanced lighting and display devices. [ 39 ]…”

Section: Resultsmentioning

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 asymmetric ratio of complexes (C1-C5) substantially increases from 1.28-1.56 as tabulated in Table IV and is found to be greater than 1, thus justifying the asymmetric environment around the Tb 3+ ion. 40 Generally, MATLAB software is employed to evaluate the CIE chromaticity coordinates of the complexes by using corresponding emission spectral data and results are tabulated in Table V. The particular emission of complexes is displayed by a Commission International De I'Eclairage (CIE) chromaticity diagram.…”

Section: Optical Featuresmentioning

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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“…Also, the radiation reabsorption mechanism is not considered here because this mechanism needs an overlapping between PL spectra of activator Dy 3+ ions and we don't get any spectral overlap while analyzing the PL properties of Ca9Al(PO4)7:Dy 3+ nanophosphors. Hence, the only mechanism responsible for the non-radiative energy transfer process is multipole-multipole interactions and the exact type of electric multipolar interactions can be determined by employing Huang analysis which correlates PL intensity with concentration as per the following relationship [27,40]:…”

Section: Concentration Quenchingmentioning

confidence: 99%

“…But Nowadays, inorganic phosphate compounds A9B(PO4)7 type where ( A = Ca 2+ , Sr 2+ , and B = La 3+ , Y 3+ , Gd 3+ , and Al 3+ ions) have been widely attaining the limelight in the domain luminescent materials due to their rare optical properties, less sintering temperature, low cost of synthesis and high chemical stability, etc. [23,27,28]. Consequently, Ca9Al(PO4)7 could be a good choice as a host matrix for fabricating rare-earth ions doped nanophosphors.…”

Section: Introductionmentioning

confidence: 99%

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Dahiya

Kumar

2021

J Mater Sci: Mater Electron

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A series of novel single-phase white light-emitting Dy 3+ doped Ca9Al(PO4)7 nanophosphors was successfully synthesized at 1100 ˚C via solution combustion route. X-ray diffraction (XRD) and Rietveld refinement analysis of Ca9Dy0.03Al0.97(PO4)7 sample confirmed that this phosphor had a trigonal crystal structure with space group R3c(161). Meanwhile, as-observed from the transmission electron microscopy (TEM) study; particles of Ca9DyxAl(1-x)(PO4)7 samples were found to have a quadrilateral shape with crystallite sizes around 40-60 nm which were also confirmed by the Debye Scherrer equation. Under near-ultraviolet (NUV) excitation at 350 nm, photoluminescence (PL) emission spectra of nanocrystalline Ca9Al(PO4)7: Dy 3+ phosphors showed two peaks at 481 nm and 572 nm corresponding to 4 F9/2→ 6 H15/2 and 4 F9/2→ 6 H13/2 transitions, respectively. The optimum concentration was found to be x = 0.03 mol. The critical energy transfer distance was calculated to be 20 and further Huang analysis concluded the exact mechanism i.e. dipole-dipole interactions responsible for concentration quenching in Ca9DyxAl(1-x)(PO4)7 samples. Furthermore, the Commission Internationale de I'Eclairage (CIE) chromaticity coordinates of Ca9Dy0.03Al0.97(PO4)7 nanophosphor was calculated to be (0.260, 0.297) and this nanophosphor had correlated color temperature (CCT) of 11332 K which is located in a cool white area. Existing results indicate that Ca9Dy0.03Al0.97(PO4)7 nanophosphor may be considered as a favorable candidate in NUV based single-phase cool White light-emitting diodes (WLEDs).

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Radiative and non-radiative characteristics of Ca9Bi(PO4)7:Eu3+ nano-phosphor for solid state lighting devices

Cited by 31 publications

References 44 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

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

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

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