Optical property investigations of polystyrene capped Ca2P2O7:Dy3+ persistent phosphor

Jain, Abhilasha; Kumar, Ashwini; Dhoble, S.J.; Peshwe, D. R.

doi:10.1016/j.materresbull.2015.06.018

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…These materials need to have a sufficiently wide band gap, low phonon frequency, high thermochemical stability, easy availability, ease of synthesis, environmental benignness, etc. In fact, recently we have realized the potential of oxide-based hosts not only for lanthanide-doped luminescence but also as strong candidates to be used in future generations of rare-earth-free luminescence materials either due to the presence of defects in the band gap or because of intrinsic charge transfer transitions. − Pyrophosphate hosts belong to the category of ideal oxide-based hosts and have been explored extensively from a luminescence point of view in the field of lanthanide-activated phosphors, persistent phosphors, dosimetry, UV-emitting phosphors for biocidal applications, contrast agents for nuclear magnetic resonance imaging (MRI), − etc.…”

Section: Introductionmentioning

confidence: 99%

Origin of Blue-Green Emission in α-Zn₂P₂O₇ and Local Structure of Ln³⁺ Ion in α-Zn₂P₂O₇:Ln³⁺ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

et al. 2016

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Considering the fact that pyrophosphate-based hosts are in high demand for making highly efficient luminescence materials, we doped two visible lanthanide ions, viz. Sm and Eu, in ZnPO. Interestingly, it was oberved that pure ZnPO displayed blue-green dual emission on irradiation with ultraviolet light. Emission and lifetime spectroscopy shows the presence of defects in pyrophosphate samples which are responsible for such emission. DFT calculations clearly pinpointed that the electronic transitions between defect states located at just below the conduction band minimum (arises due to V and V defects) and valence band maximum, as well as impurity states situated in the band gap, can lead to dual emission in the blue-green region, as is also indicated by emission and lifetime spectra. X-ray absorption near edge spectroscopy (XANES) shows the stabilization of europium as well as samarium ion in the +3 oxidation state in α-ZnPO. The fact that α-ZnPO has two different coordination numbers for zinc ions, i.e. five- and six-coordinate, the study of dopant ion distribution in this particular matrix will be an important step in realizing a highly efficient europium- and samarium-based red-emitting phosphor. Time resolved photoluminescence (TRPL) shows that both of these ions are heterogeneously distributed between five- and six-coordinated Zn sites and it is the six-coordinated Zn site which is the most favorable for lanthanide ion doping. Extended X-ray absorption fine structure (EXAFS) measurements also suggested that a six-coordinated zinc ion is the preferred site occupied by trivalent lanthanide ions, which is in complete agreement with TRPL results. It was observed that there is almost complete transfer of photon energy from ZnPO to Eu, whereas this transfer is inefficient and almost incomplete in case of Sm, which is indeed important information for the realization of pyrophosphate-based tunable phosphors.

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Section: Introductionmentioning

confidence: 99%

Origin of Blue-Green Emission in α-Zn₂P₂O₇ and Local Structure of Ln³⁺ Ion in α-Zn₂P₂O₇:Ln³⁺ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

et al. 2016

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“…This indicates the quenching effect concentration of Dy 3+ ions as well as its dependence on the concentration of rare earth element, which further reduces the emission intensity. Such an experience may be attributed to one' of the Quantum Mechanic rules that the location of rare earth ion at a high centosymmetric rate forbids the f-f levels of electric dipole transition [16,17]. In the photoluminescence spectra, broad peak can be seen in the yellow light emission region centred at 572 nm corresponding to the 4 F 9/2 to 6 H 13/2 transition of Dy 3+ ions [18,19].…”

Section: Photoluminescence Analysismentioning

confidence: 99%

“…Rare earth (RE) ions, more particularly, Ba sites in (Ba 1 − x Bi 0.01 )TiO 3 host are a natural trivalent compounds. RE ions are widely studied as the unique 4f transition levels of lanthanide ions, shielded by the outer 5s and 5p electron orbitals feature charming optical personality [6]. They are ineffectually dependent on the coordination environs resulting in feeble or sturdy emission peaks.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bi2+ ions on the photoluminescence properties of BaTiO3:Dy3+ perovskite phosphors for LEDs application

Arulmozhi

Vishista

Subalakshmi³

2021

Preprint

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A series of (Ba1-xBi0.01)TiO3 doped with Dy3+ ions of varying concentrations is prepared by single step solid state reaction that promulgates solid state lighting device applications. The cubic phase perovskite structure of the prepared samples is determined by the Powder X-ray diffraction results. The emission spectra show evidence of intensive peaks at 572 nm attributing to the 4F9/2 to 6H15/2 of Dy3+ ions. Dy3+ doped phosphors (Ba1-xBi0.01) TiO3: xDy3+ (x= 0, 0.01, 0.03, 0.05 and 0.07) exhibit yellow emission and the highest intensity of emission demarcates the optimum concentration of Ba1-xBi0.01TiO3:0.05Dy3+. SEM studies to assess the surface morphologies alongside the elemental analyses from Energy dispersion spectroscopy (EDS) extensively for optimal concentration have been ventured. The Commission International De I-Eclairage (CIE) and Correlated Color Temperature (CCT) analyses authenticate the present phosphor genuine for fabricating light emitting diodes.

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Effect of bismuth ions on the photoluminescence properties of BaTiO3:Dy3+ perovskite phosphors for LEDs application

Arulmozhi

Vishista

Subalakshmi³

2021

J Mater Sci: Mater Electron

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Optical property investigations of polystyrene capped Ca2P2O7:Dy3+ persistent phosphor

Cited by 9 publications

References 31 publications

Origin of Blue-Green Emission in α-Zn₂P₂O₇ and Local Structure of Ln³⁺ Ion in α-Zn₂P₂O₇:Ln³⁺ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

Origin of Blue-Green Emission in α-Zn₂P₂O₇ and Local Structure of Ln³⁺ Ion in α-Zn₂P₂O₇:Ln³⁺ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

Effect of Bi2+ ions on the photoluminescence properties of BaTiO3:Dy3+ perovskite phosphors for LEDs application

Effect of bismuth ions on the photoluminescence properties of BaTiO3:Dy3+ perovskite phosphors for LEDs application

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Optical property investigations of polystyrene capped Ca2P2O7:Dy3+ persistent phosphor

Cited by 9 publications

References 31 publications

Origin of Blue-Green Emission in α-Zn2P2O7 and Local Structure of Ln3+ Ion in α-Zn2P2O7:Ln3+ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

Origin of Blue-Green Emission in α-Zn2P2O7 and Local Structure of Ln3+ Ion in α-Zn2P2O7:Ln3+ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

Effect of Bi2+ ions on the photoluminescence properties of BaTiO3:Dy3+ perovskite phosphors for LEDs application

Effect of bismuth ions on the photoluminescence properties of BaTiO3:Dy3+ perovskite phosphors for LEDs application

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Origin of Blue-Green Emission in α-Zn₂P₂O₇ and Local Structure of Ln³⁺ Ion in α-Zn₂P₂O₇:Ln³⁺ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements

Origin of Blue-Green Emission in α-Zn₂P₂O₇ and Local Structure of Ln³⁺ Ion in α-Zn₂P₂O₇:Ln³⁺ (Ln = Sm, Eu): Time-Resolved Photoluminescence, EXAFS, and DFT Measurements