Excited states dynamics under high pressure in lanthanide-doped solids

Grinberg, M.

doi:10.1016/j.jlumin.2010.10.043

Cited by 37 publications

(34 citation statements)

References 29 publications

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“…This effect has been previously observed in many different compounds27. The first coordination sphere of the Eu 2+ in (Sr 0.98-x Ba x Eu 0.02 ) Si 2 O 2 N 2 is build with negative ions having approximately cubic symmetry.…”

Section: Resultssupporting

confidence: 65%

“…Properties of complex consisting of Eu 2+ ions and its negatively charged coordination sphere can be described using crystal field approximation in such case high hydrostatic pressure causes the increase of the energies of the 4f 7 , 4f 6 5d 1 electronic configuration with respect to the host bands energies and the increase of the 4f 6 5d 1 levels splitting2425. The superposition of these effects are seen as a pressure-induced diminishing of the energy of luminescence related to the 4f 6 5d 1 → 4f 7 transition.…”

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confidence: 99%

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Structural phase transitions and photoluminescence properties of oxonitridosilicate phosphors under high hydrostatic pressure

Lazarowska

Mahlik

Liu

2016

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Spectroscopic properties of a series of (Sr0.98-xBaxEu0.02)Si2O2N2 (0 ≤ x ≤ 0.98) compounds has been studied under high hydrostatic pressure applied in a diamond anvil cell up to 200 kbar. At ambient pressure the crystal structures of (Sr0.98-xBaxEu0.02)Si2O2N2 (0 ≤ x ≤ 0.98) are related to the ratio of strontium to barium and three different phases exists: orthorhombic Pbcn(0.78 ≤ x ≤ 0.98), triclinic P1 (0 < x ≤ 0.65) and triclinic P1 (0.65 < x < 0.78). It was found that Eu2+ luminescence reveals abrupt changes under pressure (decay time, energy and shape) which indicate the variation of the local symmetry and crystal field strength in Eu2+ sites. These changes are attributed to the reversible pressure-induced structural phase transitions of triclinic (Sr0.98-xBaxEu0.02)Si2O2N2 into orthorhombic structure. Pressure in which phase transition occurs decreases linearly with increasing of Ba composition in (Sr0.98-xBaxEu0.02)Si2O2N2 series. Additionally, very different pressure shifts of the Eu2+ luminescence in different phases of (Sr0.98-xBaxEu0.02)Si2O2N2:Eu from −40 cm−1/kbar to 0 cm−1/kbar have been observed. This effect is explained by different interaction of the Eu2+ 5d electron with the second coordination sphere around the impurity cations.

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Section: Resultssupporting

confidence: 65%

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confidence: 99%

Structural phase transitions and photoluminescence properties of oxonitridosilicate phosphors under high hydrostatic pressure

Lazarowska

Mahlik

Liu

2016

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“…Consequently, the ETE luminescence was observed only in the Ca I site. This relationship between the relative energy location of ETE and 5d states and optical properties in other Eu 2+ -doped compounds is already explained by many researchers [32][33][34][35][36][37][38].…”

Section: Vacuum Referred Binding Energymentioning

confidence: 52%

Evidence of three different Eu2+ sites and their luminescence quenching processes in CaAl2O4:Eu2+

2015

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“…Actually, one can consider more general dependence on R À m , where m depends on the type of interaction between 4f n electrons and ligands [23]. According to these considerations the energies of the states of the 4f 2 electronic configuration of Pr 3 þ increases with respect to the conduction band edge.…”

Section: Results Discussionmentioning

confidence: 99%