Pressure evolution of luminescence in Sr Ba1−(NbO2)3:Pr3+ (x=1/2 and 1/3)

Mahlik, Sebastian; Lazarowska, Agata; Speghini, Adolfo; Bettinelli, Marco

doi:10.1016/j.jlumin.2013.11.041

Cited by 11 publications

(15 citation statements)

References 23 publications

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“…An alternative way to induce irreversible modifications in the local field surrounding the RE 3+ ions is by densification of the glass structure under high pressure, promoting irreversible changes in the interatomic distances and bonding angles. The effect of high pressure on the luminescence properties of vitreous and crystalline systems doped with RE 3+ ions has been investigated in situ using the diamond anvil cell (DAC). − It is worth noting that the effect of high pressure on the structure of the GeO 2 glass was, also, extensively investigated. , In this context, the objective of this work is to study the structural and spectroscopic properties of the GeO 2 –PbO glass doped with Sm 3+ ions before and after densification at 7.7 GPa in a large volume high pressure apparatus.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

2017

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Spectroscopic and structural properties of GeO 2 −PbO glasses doped with Sm 3+ ion were investigated before and after densification at 7.7 GPa using Xray difraction, Raman spectroscopy, ellypsometry, Extended X-ray absorption fine structure (EXAFS) and absorption and luminescence spectroscopy. Judd−Ofelt (J− O) intensity parameters Ω λ (λ = 2, 4, and 6) were calculated and the Ω 2 parameter decreased for the glass after densification at 7.7 GPa due to the structural changes of the host glass induced by pressure. Shifts in the Raman band toward lower energies and variations in the intensities of the EXAFS curves indicated that the local environment around Sm 3+ became more symmetric after densification, with shorter average Sm−O distances than in the crystalline standard. The radiative properties in the vis and NIR regions were also affected by high pressure.

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Section: Introductionmentioning

confidence: 99%

High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

2017

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“…This method has been used to estimate the location of the ground states of Tb 3+ and Pr 3+ with respect to conduction band in many materials. [14][15][16][17][18][19][20][21][22][23][24] We have chosen Y 2 O 2 S doped with Eu 3+ and Y 2 O 2 S doped with Tb 3+ to demonstrate how high-pressure spectroscopy can be used to determine the energetic structures of dielectric hosts doped with Ln 3+ and Ln 2+ .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic properties and location of the Tb³⁺ and Eu³⁺ energy levels in Y₂O₂S under high hydrostatic pressure

Behrendt

Mahlik

Szczodrowski

et al. 2016

Phys. Chem. Chem. Phys.

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In this contribution, an extensive spectroscopic study of Y2O2S doped with Eu(3+) and Tb(3+) is presented. Steady-state luminescence and luminescence excitation spectra as well as the time-resolved spectra and luminescence kinetics were obtained at high hydrostatic pressures up to 240 kbar. It was found that pressure quenches the luminescence from the (5)D3 excited state of Tb(3+) and recovers additional luminescence related to transitions from the (5)D3 state of Eu(3+). These effects are related to the pressure-induced increases in the energies of the ground electronic manifold 4f(n) of Eu(3+) and Tb(3+) ions with respect to the band edges. Analysis of the emission and excitation spectra allowed the estimation of the energies of the ground states of all lanthanide (Ln) ions (Ln(3+) and Ln(2+)) with respect to the valence and conduction bands edges of the Y2O2S host. The bandgap energy and difference between energies of the ground states of Ln(2+) and Ln(3+) have been calculated as functions of pressure. The experimental high-pressure spectroscopy results allow the calculation of the absolute values (calculated with respect to the vacuum level) of the energies and pressure-induced shifts of the conduction and valence band edges and the ground states of Ln(3+) and Ln(2+) ions in Y2O2S.

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“…[11][12][13][14][15] In the case of Pr 3+ or Tb 3+ doped samples, the emission dynamics are influenced by the formation of an intermediate charge transfer state (or the impurity trapped exciton state) that interferes with the 4f excited states of the dopants by creating new relaxation channels that lead to the quenching of otherwise emitting levels. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] The ionization transition creates the Ln 4+ ion (Ln = Tb, Pr) and an electron in the conduction band (e cb ). After ionization, the Coulomb attraction between Ln 4+ and e cb allows the system to exist in the bound state, which defines an impurity trapped exciton (ITE) state (also referred to the praseodymium/terbium trapped exciton (PTE/TTE) state) in the past literature.…”

Section: Introductionmentioning

confidence: 99%

Energy levels in CaWO₄:Tb³⁺at high pressure

Mahlik

Cavalli

Amer

et al. 2015

Phys. Chem. Chem. Phys.

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The luminescence properties of Tb(3+) in CaWO4 crystals are investigated under a hydrostatic pressure of up to 200 kbar, i.e. across scheelite-to-fergusonite phase transition. It is shown that the typical blue ((5)D3) and green ((5)D4) emissions in this material are progressively quenched at room temperature as pressure is increased. This quenching is caused by a downshift of the charge transfer (or impurity trapped exciton) state that is formed between Tb(3+) and nearby W(6+) cations in conjunction with a pressure-induced increase of the lattice relaxation experienced by this excited state. An empirical model is introduced to calculate the evolution of the (Tb(3+)-W(6+)) charge transfer energy with pressure. Combined with the pressure dependence of the energy bandgap in CaWO4, the model allows locating the 4f levels of Tb(3+) relative to the fundamental host lattice for any pressure in the range 0-200 kbar.

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Pressure evolution of luminescence in Sr Ba1−(NbO2)3:Pr3+ (x=1/2 and 1/3)

Cited by 11 publications

References 23 publications

High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

Spectroscopic properties and location of the Tb³⁺ and Eu³⁺ energy levels in Y₂O₂S under high hydrostatic pressure

Energy levels in CaWO₄:Tb³⁺at high pressure

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Pressure evolution of luminescence in Sr Ba1−(NbO2)3:Pr3+ (x=1/2 and 1/3)

Cited by 11 publications

References 23 publications

High-Pressure Effect in Vis–NIR Emission of Sm3+-Doped GeO2–PbO Glasses

High-Pressure Effect in Vis–NIR Emission of Sm3+-Doped GeO2–PbO Glasses

Spectroscopic properties and location of the Tb3+ and Eu3+ energy levels in Y2O2S under high hydrostatic pressure

Energy levels in CaWO4:Tb3+at high pressure

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Product

Resources

About

High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

High-Pressure Effect in Vis–NIR Emission of Sm³⁺-Doped GeO₂–PbO Glasses

Spectroscopic properties and location of the Tb³⁺ and Eu³⁺ energy levels in Y₂O₂S under high hydrostatic pressure

Energy levels in CaWO₄:Tb³⁺at high pressure