Crystal chemistry and optical analysis of a novel perovskite type SrLa2Al2O7:Sm3+ nanophosphor for white LEDs

Devi, Sushma; Taxak, V.B.; Chahar, Sangeeta; Dalal, Mandeep; Dalal, Jyoti; Hooda, Anju; Khatkar, Avni; Malik, R.K.; Khatkar, S.P.

doi:10.1016/j.ceramint.2019.05.064

Cited by 45 publications

(7 citation statements)

References 39 publications

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“…A relatively more intense emission profile at 592 nm, corresponding to 5 D 0 → 7 F 1 , is a parity allowed magnetic transition that is completely independent of the coordination environment. [ 29 ] By contrast, 5 D 0 → 7 F 2 , an induced electric dipole (ED) transition and emitting at 613 nm, is dependent upon the polarizable ligand field around europium ion. [ 30 ] This highly intense 5 D 0 → 7 F 2 peak was responsible for the dazzling red‐coloured emission in the europium complexes that indicated that the extreme polarizable tone around the Eu(III) ion made the complexes more unsymmetrical, and thereby increased the intensity of the 5 D 0 → 7 F 2 peak.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…7 F 1 , is a parity allowed magnetic transition that is completely independent of the coordination environment. [29] By contrast, 5 D 0 ! 7 F 2 , an induced electric dipole (ED) transition and emitting at 613 nm, is dependent upon the polarizable ligand field around europium ion.…”

Section: Photoluminescence Featuresmentioning

confidence: 96%

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

et al. 2022

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“…Moreover, the value of exponent n is 2 for direct allowed transitions. The signified value of Kubelka–Munk function is given below [ 26 ] :

F ((), R_{\infty}) = \frac{{((), 1 - R_{\infty})}^{2}}{2 R_{\infty}} = \frac{K}{S}

…”

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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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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“…The magnetic dipole (MD) permitted transitions ( 4 G5/2→ 6 H5/2 and 4 G5/2→ 6 H7/2) detected at 566 and 602 nm dominate the emission spectra and are responsible for the orange-red emission of activator ions, according to the selection rule (change in j = 0, ± 1). [34][35][36].…”

Section: Photoluminescence Properties Of Sr3la(alo)3(bo3)4:sm 3+ Phos...mentioning

confidence: 99%

Synthesis and Photoluminescence characterization of Sr3La(AlO)3(BO3)4:Eu3+,Sm3+ Phosphor for W-LED

Yerojwar

Kokode

Nandanwar

et al. 2023

Phys. Chem. Solid St.

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A Red emitting with high efficiency Eu3+ doped Sr3La(AlO)3(BO3)4 and Sm3+ doped Sr3La(AlO)3(BO3)4 phosphors has been synthesized by combustion method, meanwhile, the photoluminescence properties of samples are investigated in detail. Morphology by SEM and chromaticity by CIE was studied. The results show that the excitation extends from 340 nm to 420 nm, with the highest excitation (394 nm and 406 nm) being in the violet area for Eu3+ and Sm3+ doping, indicating that the phosphor can correlate well with LED chips. Under violet light excitation of 394nm the phosphor Eu3+ doped Sr3La(AlO)3(BO3)4 and of 406 nm the phosphor Sm3+ doped Sr3La(AlO)3(BO3)4 can emit strong red light showing main emission peaks located at 617 nm and 602 nm are observed respectively. The PL properties implies the excellent stability of the phosphor. These results imply that the importance red phosphors Sr3La(AlO)3(BO3)4:Eu3+ and Sr3La(AlO)3(BO3)4:Sm3+ in W-LEDs under NUV excitation.

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Crystal chemistry and optical analysis of a novel perovskite type SrLa2Al2O7:Sm3+ nanophosphor for white LEDs

Cited by 45 publications

References 39 publications

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

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

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

Synthesis and Photoluminescence characterization of Sr3La(AlO)3(BO3)4:Eu3+,Sm3+ Phosphor for W-LED

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