Gd1.96−xYxEu0.04O3 (x=0.0, 0.49, 0.98, 1.47, 1.96mol%) nanophosphors: Propellant combustion synthesis, structural and luminescence studies

Shilpa, C.J.; Dhananjaya, N.; Nagabhushana, H.; Sharma, S.C.; Shivakumara, C.; Sudheerkumar, K.H.; Nagabhushana, B.M.; Chakradhar, R.P.S.

doi:10.1016/j.saa.2014.02.099

Cited by 33 publications

(13 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Traditionally solid-state method was used for the preparation of phosphor materials for Solid State Lightining (SSL) applications. The conventional SSL method is (i) inhomogeneity of the final product, (ii) low-surface area, formation of large agglomerated particles and (iii) presence of various defects (surface, impurities) which are harmful to luminescence [24,25]. These problems were overcome by the use of solution combustion method [26].…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesized tetragonal ZrO2: Eu3+ nanophosphors: Structural and photoluminescence studies

Vidya¹,

Anantharaju²,

Nagabhushana

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

Self Cite

126

View full text Add to dashboard Cite

Novel crystalline tetragonal ZrO2: Eu(3+) phosphors were prepared by a facile and efficient low temperature solution combustion method at 400±10 °C using oxalyl dihydrazide (ODH) as fuel. The powder X-ray diffraction patterns and Rietveld confinement of as formed ZrO2: Eu(3+) (1-11 mol%) confirmed the presence of body centered tetragonal phase. The crystallite size estimated from Scherrer's and W-H plots was found to be in the range of 7-17 nm. These results were in good agreement with transmission electron microscopy studies. The calculated microstrain in most of the planes indicated the presence of tensile stress along various planes of the particles. The observed space group (P42/nmc) revealed the presence of cations in the 2b positions (0.75, 0.25, 0.25) and the anions in the 4d positions (0.25, 0.25, 0.45). The optical band gap energies estimated from Wood and Tauc's relation was found to be in the range 4.3-4.7 eV. Photoluminescence (PL) emission was recorded under 394 and 464 nm excitation shows an intense emission peak at 605 nm along with other emission peaks at 537, 592, 605 and 713 nm. These emission peaks were attributed to the transition of (5)D0→(7)FJ (J=0, 1, 2, 3) of Eu(3+) ions. The high ratio of Intensity of ((5)D0→(7)F2) and ((5)D0→(7)F1) infers that Eu(3+) occupies sites with a low symmetry and without an inversion center. CIE color coordinates indicated the red regions which could meet the needs of illumination devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Combustion synthesized tetragonal ZrO2: Eu3+ nanophosphors: Structural and photoluminescence studies

Vidya¹,

Anantharaju²,

Nagabhushana

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

Self Cite

126

View full text Add to dashboard Cite

show abstract

“…FTIR spectroscopy was carried out on all samples and the spectra are shown in Figure . The peak at 3422 cm −1 was due to the presence of adsorbed moisture . The sharp band at 873 cm −1 was attributed to stretching and the bending vibrations of Zr–O .…”

Section: Resultsmentioning

confidence: 98%

Structural and luminescent studies of erbium‐doped CaZrO₃ green‐emitting nanophosphors

et al. 2017

View full text Add to dashboard Cite

Erbium (Er) (0.5, 1.0 and 1.5 wt%)-doped CaZrO nanophosphors were synthesized by the sol-gel method using poly(vinyl alcohol) as the chelating agent. Their structural and photoluminescence properties were studied using X-ray diffraction (XRD), field emission scanning electron microscopy-energy dispersive spectroscopy (FESEM-EDS), transmission electron microscopy (TEM), photoluminescence and Fourier transform infrared spectroscopy (FTIR). The XRD patterns of the samples confirm that nanoscale crystallite sizes. Agglomeration of the samples was observed using field emission scanning electron microscopy images. Energy dispersive spectroscopy measurements confirmed the existence of Ca, Zr, O and Er in the samples. Average particle sizes for the samples were calculated from transmission electron microscopy images. FTIR spectra clearly show characteristic absorption bands related to the metal oxides, as well as some other organic molecules. The photoluminescence spectra show bands in the green region. The Commission International de l'Eclairage coordinates were calculated and found to be in green region.

show abstract

“…The effects of microstrain and crystallite size on the FWHM can be expressed by Williamson–Hall (W–H) plot:

βcosθ = \frac{0.9 normalλ}{D} + 4 ε sin θ

where ‘β’ is the measured FWHM (in radians); ‘θ’ is the Bragg angle of the peak; ‘λ’ is the X‐ray diffraction wavelength and ‘ε’ is the strain associated with the nanophosphors. The above equation represents a straight line between 4εsinθ (x‐axis) and βcosθ (y‐axis) . Figure shows the W–H plots of the Y 2 O 3 :Cr 3 + (0.5–9 mol%) nanophosphors.…”

Section: Resultsmentioning

confidence: 99%

Extraction of Y₂O₃:Cr³⁺ nanophosphor by eco‐friendly approach and its suitability for white light‐emitting diode applications

Kumar

Ramgopal²,

Sunitha

et al. 2016

Luminescence

Self Cite

View full text Add to dashboard Cite

Cr -doped Y O (0.5-9 mol%) was synthesized by a simple solution combustion method using Aloe vera gel as a fuel/surfactant. The final obtained product was calcined at 750°C for 3 h, which is the lowest temperature reported so far for the synthesis of this compound. The calcined product was confirmed for its crystallinity and purity by powder X-ray diffraction (PXRD) studies which showed a single-phase nano cubic phosphor. The particles size estimated by Scherrer formula was in the range of 6-19 nm. The UV-vis spectra showed absorption bands at 198, 272 and 372 nm having band gap energy in the range 4.00-4.26 eV. In order to investigate the possibility of its use in white light emitting display applications, the photoluminescence properties of Cr -doped Y O nanophosphors were studied at an excitation wavelength in the near ultraviolet (UV) light region (361 nm). The emission spectra consisted of emission peaks in the blue ( F → H ), orange ( F → H ) and red ( F → H ) regions. The CIE coordinates (0.33, 0.33) lie in the white light region. Hence Y O :Cr can be used for white light-emitting diode (LED) applications.

show abstract

Gd1.96−xYxEu0.04O3 (x=0.0, 0.49, 0.98, 1.47, 1.96mol%) nanophosphors: Propellant combustion synthesis, structural and luminescence studies

Cited by 33 publications

References 27 publications

Combustion synthesized tetragonal ZrO2: Eu3+ nanophosphors: Structural and photoluminescence studies

Combustion synthesized tetragonal ZrO2: Eu3+ nanophosphors: Structural and photoluminescence studies

Structural and luminescent studies of erbium‐doped CaZrO₃ green‐emitting nanophosphors

Extraction of Y₂O₃:Cr³⁺ nanophosphor by eco‐friendly approach and its suitability for white light‐emitting diode applications

Contact Info

Product

Resources

About

Gd1.96−xYxEu0.04O3 (x=0.0, 0.49, 0.98, 1.47, 1.96mol%) nanophosphors: Propellant combustion synthesis, structural and luminescence studies

Cited by 33 publications

References 27 publications

Combustion synthesized tetragonal ZrO2: Eu3+ nanophosphors: Structural and photoluminescence studies

Combustion synthesized tetragonal ZrO2: Eu3+ nanophosphors: Structural and photoluminescence studies

Structural and luminescent studies of erbium‐doped CaZrO3 green‐emitting nanophosphors

Extraction of Y2O3:Cr3+ nanophosphor by eco‐friendly approach and its suitability for white light‐emitting diode applications

Contact Info

Product

Resources

About

Structural and luminescent studies of erbium‐doped CaZrO₃ green‐emitting nanophosphors

Extraction of Y₂O₃:Cr³⁺ nanophosphor by eco‐friendly approach and its suitability for white light‐emitting diode applications