Effects of Ce3+ Codoping and Annealing on Phase Transformation and Luminescence of Eu3+-Doped YPO4 Nanorods: D2O Solvent Effect

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

doi:10.1021/ja909578s

Cited by 166 publications

(137 citation statements)

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“…4(c)), we observe a small peak at ∼141.1 eV which corresponds to Eu 3+ (4d 3/2 ) and no peak corresponding to Eu 2+ (4d 5/2 ) is observed at ∼127.1 eV. 24 This confirms the high probability of Eu 3+ present in samples. Figure 4(d) shows the XPS spectra of Y(2p 1/2 ) and its corresponding peaks at ∼299.4, 300.1 eV for 0 and 10 at.% Li + YPO 4 :5Eu samples are observed.…”

Section: Xps Studysupporting

confidence: 77%

“…22 It was reported that Y-O bond length changes whereas P-O bond length almost remains the same on annealing YPO 4 nanoparticles at higher temperatures. 23 In past few years, Ningthoujam and his co-workers 24 has examined the luminescence properties of Ln 3+ ion doped YPO 4 nanoparticles. It was found that the presence of water molecules up to 800 • C in Ce 3+ co-doped YPO 4 :Eu was observed and thus the luminescence intensity was quenched significantly.…”

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: Xps Studysupporting

confidence: 77%

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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“…Due to a sharp emission, these compounds are also used as host for luminescence applications 6,7,13 including lasers and display devices. A combination of rare-earth phosphates and silicates is used as host for nuclear wastes 14 .…”

Section: Introductionmentioning

confidence: 99%

“…LaPO4 crystallizes in two polymorphs, namely, the tetragonal phase (xenotime structure) and the monoclinic phase (monazite structure). Yttrium orthophosphate, YPO4, also has the tetragonal symmetry (xenotime type) 6 . Doping YPO4 matrix with Ce 3+ and Eu…”

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confidence: 99%

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Neutron diffraction reveals the existence of confined water in triangular and hexagonal channels of modified YPO4 at elevated temperatures

Mishra

Ningthoujam

Mittal

et al. 2017

Phys. Rev. Materials

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We provide experimental evidence for confinement of water molecules in the pores of hexagonal structure of YPO4 at elevated temperatures upto 600 K using powder neutron diffraction. In order to avoid the large incoherent scattering from the hydrogen, deuterated samples of doped YPO4:Ce-Eu were used for diffraction measurements. The presence of water molecules in the triangular and hexagonal pores in the hexagonal structure was established by detailed simulation of the diffraction pattern and Rietveld refinement of the experimental data. It was observed that the presence of water leads specifically to suppression of the intensity of a peak around Q = 1.04 Å -1 while the intensity of peaks around Q=1.83Å -1 is enhanced in the neutron diffraction pattern. We estimate the number of water molecules as 2.36 (6) per formula units at 300 K and the sizes of the hexagonal and triangular pores as7.2 (1) Å and 4.5 (1) Å, respectively. With increase in temperature, the water content in both the pores decreases above 450 K and vanishes around 600 K. Analysis of the powder diffraction data reveals that the hexagonal structure with the pores persist up to 1273 K, and transforms to another structure at 1323 K. The high temperature phase is not found to have the zircon or the monazite type structure, but a monoclinic structure (space group P2/m) with lattice parameters am= 6.826 (4) Å, bm= 6.645 (4) Å, cm= 10.435 (9)Å, and β= 107.21 (6)°. The monoclinic structure has about 14 % smaller volume than the hexagonal structure which essentially reflects the collapse of the pores. The phase transition and the change in the volume are also confirmed by x-ray diffraction measurements. The hexagonal to the monoclinic phase transition is found to be irreversible on cooling to room temperature. 2 IntroductionRare-earth (RE) phosphates and its derivatives (REPO4:RE=La, Ce, Gd or Y) exhibit exotic properties like chemical stability, excellent high-temperature properties, high radiation damage tolerance, high luminescence quantum yield, high energy band gap, etc [1][2][3][4][5][6][7][8][9][10][11][12] . Due to a sharp emission, these compounds are also used as host for luminescence applications 6,7,13 including lasers and display devices. A combination of rare-earth phosphates and silicates is used as host for nuclear wastes 14 . At ambient condition, depending on the ionic radii of RE ion and synthesis route, the compounds can crystalize in tetragonal, hexagonal and monoclinic phases 13,[15][16][17][18] .A smaller ionic radius compared to the ionic radius of Gd generally adopts the tetragonal structure, whereas other orthophosphates have the lower-symmetry monoclinic structure. Depending on the synthesis conditions, GdPO4, TbPO4, DyPO4, and HoPO4 can adopt either zircon or monazite structure 13,16,[19][20][21] . LaPO4 crystallizes in two polymorphs, namely, the tetragonal phase (xenotime structure) and the monoclinic phase (monazite structure). Yttrium orthophosphate, YPO4, also has the tetragonal symmetry (xenotime type) 6 . Doping YPO4 matri...

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Orthogonally Polarized Luminescence of Single Bismuth Phosphate Microcrystal Doped with Europium

Zhang

et al. 2020

Advanced Optical Materials

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Rare‐earth‐doped micro/nanocrystals are significant candidates for nanophotonic and quantum information elements. Nevertheless, the polarization of light emission, which serves as one of the most widely adopted optical information carriers, has been rarely studied in such micro/nanocrystals due to the random crystalline orientation of the ensemble cluster as grown. Herein the polarization‐resolved spectroscopy on a single europium‐doped bismuth phosphate (BiPO4:Eu) microcrystal is performed, and a series of partially linearly polarized emission in the visible spectrum is observed, which can be grouped into orthogonal pairs. Such emission features are well explained by a phenomenological model of group theory that gives rise to the existence of optical C2 axes induced by local symmetry breaking. Such a polarization detection provides a neat optical method to distinguish single micro/nanocrystals from clusters, and confirms the tunable polarization features by selecting the suitable single microcrystal and engineering its orientation of crystalline axis. The rare‐earth‐doped single micro/nanocrystals, with precise positioning technique realized, can promisingly serve as controllable polarization devices on integrated photonic circuits.

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Effects of Ce³⁺ Codoping and Annealing on Phase Transformation and Luminescence of Eu³⁺-Doped YPO₄ Nanorods: D₂O Solvent Effect

Cited by 166 publications

References 39 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

Neutron diffraction reveals the existence of confined water in triangular and hexagonal channels of modified YPO4 at elevated temperatures

Orthogonally Polarized Luminescence of Single Bismuth Phosphate Microcrystal Doped with Europium

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