Effect of alkali metal ions (Li+, Na+ and K+) on the luminescence properties of CaMgB2O5: Sm3+ nanophosphor

Manhas, M.; Kumar, Vinay; Sharma, Vishal; Ntwaeaborwa, O.M.; Swart, H.C.

doi:10.1016/j.nanoso.2015.06.003

Cited by 43 publications

(5 citation statements)

References 31 publications

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“…The defects could increase the process of nonradiative that reducing the photoluminescence intensity of phosphors. 23 The following equation shows the possible mechanism of charge balance without charge compensator ions:…”

Section: Resultsmentioning

confidence: 99%

Effect of Charge Compensation on the Photoluminescence and Thermal Stability of Trivalent Samarium-Doped Calcium Barium Phosphate Phosphors

Chiang

Fang

Chu

2017

ECS J. Solid State Sci. Technol.

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A series of Ca6BaP4O17:Sm3+ phosphors without or with different charge compensation approaches (co-doping Li+ or Na+ ions) were synthesized by using a conventional solid-state reaction method. The crystal structure and morphologies of the phosphors were investigated by using X-ray diffraction pattern and scanning electron microscope after synthesizing the phosphor, respectively. The luminescence and spectral properties were studied by photoluminescence and diffuse reflectance spectroscopy. By introducing the charge compensator alkali metal ions A+ (A = Li and Na) into the lattice of Ca6BaP4O17:Sm3+ phosphor, its emission intensity can be enhanced. The phosphors under 405 nm excitation show characteristic emission of Sm3+ ion with the main orange–red peak centered at 602 nm. The results suggested that the Li+ ion is a good charge compensator in Ca6BaP4O17:Sm3+ phosphors due to its enhancement in luminescence and as a flux for improving the morphology of phosphors. The calculated CIE coordinates and color purity of phosphors with charge compensation of optimal Li+ ions co-doping concentration are (0.6090, 0.3892) in the orange–red region of the spectrum and ∼ 99.5% under 405 nm excitation. Besides, the thermal stability of proposed samples can be improved from 84% to 93% which is pretty high compared with published data. The mechanism is detailed in this paper.

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Section: Resultsmentioning

confidence: 99%

Effect of Charge Compensation on the Photoluminescence and Thermal Stability of Trivalent Samarium-Doped Calcium Barium Phosphate Phosphors

Chiang

Fang

Chu

2017

ECS J. Solid State Sci. Technol.

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“…PXRDs were measured for 1 h. Small shifts in PXRD patterns are not uncommon for nanoparticles. A number of effects can be considered for such shifts including the range of stoichiometric composition, partly inhomogeneous element distribution, defects such as stacking and twin faults and nanosized crystalline domains being much smaller than the bulk reference material causing lattice contraction or expansion and strain [ 65 – 69 ].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of rare-earth metal and rare-earth metal-fluoride nanoparticles in ionic liquids and propylene carbonate

Siebels¹,

Mai²,

Schmolke³

et al. 2018

Beilstein J. Nanotechnol.

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Decomposition of rare-earth tris(N,N′-diisopropyl-2-methylamidinato)metal(III) complexes [RE{MeC(N(iPr)2)}3] (RE(amd)3; RE = Pr(III), Gd(III), Er(III)) and tris(2,2,6,6-tetramethyl-3,5-heptanedionato)europium(III) (Eu(dpm)3) induced by microwave heating in the ionic liquids (ILs) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIm][NTf2]) and in propylene carbonate (PC) yield oxide-free rare-earth metal nanoparticles (RE-NPs) in [BMIm][NTf2] and PC for RE = Pr, Gd and Er or rare-earth metal-fluoride nanoparticles (REF3-NPs) in the fluoride-donating IL [BMIm][BF4] for RE = Pr, Eu, Gd and Er. The crystalline phases and the absence of significant oxide impurities in RE-NPs and REF3-NPs were verified by powder X-ray diffraction (PXRD), selected area electron diffraction (SAED) and high-resolution X-ray photoelectron spectroscopy (XPS). The size distributions of the nanoparticles were determined by transmission electron microscopy (TEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) to an average diameter of (11 ± 6) to (38 ± 17) nm for the REF3-NPs from [BMIm][BF4]. The RE-NPs from [BMIm][NTf2] or PC showed diameters of (1.5 ± 0.5) to (5 ± 1) nm. The characterization was completed by energy-dispersive X-ray spectroscopy (EDX).

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“…PXRDs were measured for 1 h. Small shifts in PXRD patterns are not uncommon for nanoparticles. A number of effects can be considered for such shifts including a range of stoichiometric composition, partly inhomogeneous element distribution, defects such as stacking and twin faults and nanosized crystalline domains being much smaller than the bulk reference material causing lattice contraction or expansion and strain [ 97 – 101 ].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of metal-fluoride nanoparticles supported on thermally reduced graphite oxide

Schmitz

Schütte

Ilievski

et al. 2017

Beilstein J. Nanotechnol.

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Metal-fluoride nanoparticles, (MFx-NPs) with M = Fe, Co, Pr, Eu, supported on different types of thermally reduced graphite oxide (TRGO) were obtained by microwave-assisted thermal decomposition of transition-metal amidinates, (M{MeC[N(iPr)]2}n) or [M(AMD)n] with M = Fe(II), Co(II), Pr(III), and tris(2,2,6,6-tetramethyl-3,5-heptanedionato)europium, Eu(dpm)3, in the presence of TRGO in the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]). The crystalline phases of the metal fluorides synthesized in [BMIm][BF4] were identified by powder X-ray diffraction (PXRD) to be MF2 for M = Fe, Co and MF3 for M = Eu, Pr. The diameters and size distributions of MFx@TRGO were from (6 ± 2) to (102 ± 41) nm. Energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) were used for further characterization of the MFx-NPs. Electrochemical investigations of the FeF2-NPs@TRGO as cathode material for lithium-ion batteries were evaluated by galvanostatic charge/discharge profiles. The results indicate that the FeF2-NPs@TRGO as cathode material can present a specific capacity of 500 mAh/g at a current density of 50 mA/g, including a significant interfacial charge storage contribution. The obtained nanomaterials show a good rate capacity as well (220 mAh/g and 130 mAh/g) at a current density of 200 and 500 mA/g, respectively.

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Effect of alkali metal ions (Li+, Na+ and K+) on the luminescence properties of CaMgB2O5: Sm3+ nanophosphor

Cited by 43 publications

References 31 publications

Effect of Charge Compensation on the Photoluminescence and Thermal Stability of Trivalent Samarium-Doped Calcium Barium Phosphate Phosphors

Effect of Charge Compensation on the Photoluminescence and Thermal Stability of Trivalent Samarium-Doped Calcium Barium Phosphate Phosphors

Synthesis of rare-earth metal and rare-earth metal-fluoride nanoparticles in ionic liquids and propylene carbonate

Synthesis of metal-fluoride nanoparticles supported on thermally reduced graphite oxide

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