Preparation of white light emitting YVO4: Ln3+ and silica-coated YVO4:Ln3+ (Ln3+ = Eu3+, Dy3+, Tm3+) nanoparticles by CTAB/n-butanol/hexane/water microemulsion route: Energy transfer and site symmetry studies

Luwang, Meitram Niraj; Ningthoujam, R. S.; Srivastava, S. K.; Vatsa, R.K.

doi:10.1039/c0jm03470c

Cited by 133 publications

(62 citation statements)

References 41 publications

(40 reference statements)

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“…There are many research articles available to show the enhancement of luminescence in Eu 3+ doped YPO 4 nanophosphor by co-doping Li + and Bi 3+ appreciably, in which the intensity of magnetic dipole transition is predominant over electric dipole transition. 2,25,26 But in some cases, the intensity of electric dipole transition is predominant over magnetic dipole transition in Eu 3+ doped (Y/La)PO 4 /YPO 4 .nH 2 O, which is expected from the theoretical view on site symmetry of Y 3+ where Eu 3+ ions occupy. [27][28][29][30][31][32] Existence of intermediate bands observed in YPO 4 system has not been discussed much in literature.…”

Section: Introductionmentioning

confidence: 89%

“…[1][2][3][4][5][6][7][8] The great interest in doping of trivalent lanthanide ions in host arises from their unique intra-configurational f-f transitions, which occur as sharp and intense emission lines. They are extensively used in plasma display panels (PDPs), field emission displays (FEDs), cathode ray tubes (CRTs), fluorescent lamps and laser devices, etc.…”

Section: Introductionmentioning

confidence: 99%

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Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Parchur¹,

Prasad²,

Bahadur³

et al. 2012

AIP Advances

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This article explores the tuning of blue to pink colour generation from Li+ ion co-doped YPO4:5Eu nanoparticles prepared by polyol method at ∼100-120 °C with ethylene glycol (EG) as a capping agent. Interaction of EG molecules capped on the surface of the nanoparticles and/or created oxygen vacancies induces formation of intermediate/mid gap bands in the host structure, which is supported by UV-Visible absorption data. Strong blue and pink colors can be observed in the cases of as-prepared and 500 °C annealed samples, respectively. Co-doping of Li+ enhances the emission intensities of intermediate band as well as Eu3+. On annealing as-prepared sample to 500 °C, the intermediate band emission intensity decreases, whereas Eu3+ emission intensity increases suggesting increase of extent of energy transfer from the intermediate band to Eu3+ on annealing. Emission intensity ratio of electric to magnetic dipole transitions of Eu3+ can be varied by changing excitation wavelength. The X-ray photoelectron spectroscopy (XPS) study of as-prepared samples confirms the presence of oxygen vacancies and Eu3+ but absence of Eu2+. Dispersed particles in ethanol and polymer film show the strong blue color, suggesting that these materials will be useful as probes in life science and also in light emitting device applications

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Parchur¹,

Prasad²,

Bahadur³

et al. 2012

AIP Advances

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“…From the above discussion it is observed that PEG molecules play important role in nanohybrids formation. Figure 4A shows the excitation spectra of 2 at.% of Dy doped YVO 4 [12]. There is a shift of peak from lower to higher wavelength on annealing as-prepared sample to 500 or 900°C.…”

Section: Vibrational Studymentioning

confidence: 99%

“…Figure 5A shows the emission spectra of the YVO 4 :2Dy nanoparticles, as-prepared and annealing at different temperature 500 and 900°C, respectively. Here, emissions spectra are monitored at V-O [12,13]. There is strong energy transfer from host to dopant Dy 3+ ion (Scheme 1).…”

Section: Vibrational Studymentioning

confidence: 99%

Enhancement of Luminescence Intensity in Dy3+ Ions Doped YVO4 Nanomaterials by Ba2+ Ion Codoping and YVO4:2Dy/Fe3O4 Nanohybrid for Hyperthermia Application

S¹,

Preman²,

S³

2017

J Nanomed Nanotechnol

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The enhancement of the luminescence intensity of the Dy 3+ by Ba 2+ ions (at different concentrations) codoping into YVO 4 :2Dy nanoparticles at different annealing temperature of as-prepared, at 500 and 900°C were studied. The XRD study shows the strains are induced when dopant and codopant are incorporated into host matrix. XRD patterns of nanohybrids show the existence of two phases corresponding to YVO 4 :2Dy and Fe 3 O 4 nanoparticles. TEM image of YVO 4 :2Dy nanoparticles were spherical shape whereas for YVO 4 :2Dy/Fe 3 O 4 nanohybrids, the spherical particles are forming chain like structure due to the PEG molecule which binds both YVO 4 :2Dy and Fe 3 O 4 during nanohybrids formation. Increase in absorption coefficient and decrease in lattice strain values are the major reasons for the enhancement of emission intensity in photoluminescent (PL). Lifetime studies also shows correlation between the calculated energy transfer and diffusion for indirect excitation which is also studied here. High quantum efficiency up to 45% can be achieved. YVO 4 :2Dy/Fe 3 O 4 nanohybrids is found to achieve hyperthermia temperature 42°C in short time. This nanohybrids shows luminescence in the region of biological window indicating nanohybrids can be used as bioimaging probe. It also shows high viability up to 94% in HeLa cancer cells.

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“…Using this environment [11][12][13][14][15][16], QTF is dropped into the solution. Humidity will act on the coated layer and corresponding shift in frequency occurs.…”

Section: Structure Morphology Analysismentioning

confidence: 99%

Quartz Tuning Fork as Humidity Sensor

Kg¹,

Murugan²

2017

J Nanomed Nanotechnol

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Preparation of white light emitting YVO4: Ln3+ and silica-coated YVO4:Ln3+ (Ln3+ = Eu3+, Dy3+, Tm3+) nanoparticles by CTAB/n-butanol/hexane/water microemulsion route: Energy transfer and site symmetry studies

Cited by 133 publications

References 41 publications

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Enhancement of Luminescence Intensity in Dy3+ Ions Doped YVO4 Nanomaterials by Ba2+ Ion Codoping and YVO4:2Dy/Fe3O4 Nanohybrid for Hyperthermia Application

Quartz Tuning Fork as Humidity Sensor

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