X-Ray diffraction and SAED characterisations of RE4O 4[PO4]Cl (RE = La, Pr, and Nd) and photoluminescence properties of Eu3+-doped La4O4[PO 4]Cl

Hamdi Yahia, Ute Ch Rodewald, Claus Feldmann, Marcus Roming, François Weill, Rainer Pöttgen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The new compounds RE4O4[PO4]Cl (RE = La, Nd, Sm and Gd) were synthesised by solid state reaction via a salt flux route and selected compositions were investigated by SAED, photoluminescence, and powder- and/or single crystal-X-ray diffraction. All the crystal structures consist of an alternation of [RE4O4]4+ and [ClPO4]4- layers. The [RE4O4] 4+ layer contains ORE4/4 tetrahedra which share common edges. In the tetragonal RE4O4[PO4]Cl (RE = Pr and Nd) compounds, the PO43- and Cl- anions are located between these layers in a disordered manner. This is reflected by the presence of diffuse streaks parallel to the c* axis on the SAED patterns. These lines disappear for larger rare earth metals and keep the place to well defined superstructure reflections in La4O4[PO 4]Cl, with a*superstructure = 4/5a*tetragonal - 2/5b*tetragonal and b*superstructure = 2/5a*tetragonal + 4/5b*tetragonal. The presence of these superstructure reflections is due to a new ordering of the PO43- and Cl- anions between the [RE4O4]4+ layers. The Eu 3+-doped La3PO7 and La4O 4[PO4]Cl samples show the characteristic Eu 3+-related 4f → 4f lines and intense emission of red light upon excitation via the O2- → Eu3+ charge-transfer band at 280 nm. Due to the efficient energy transfer from the charge-transfer state to the 4f-levels, especially, La4O4[PO4]Cl:Eu 3+ (5 mol%) may be of potential interest as a red phosphor.

Original languageEnglish
Pages (from-to)1131-1140
Number of pages10
JournalJournal of Materials Chemistry C
Volume2
Issue number6
DOIs
Publication statusPublished - 14 Feb 2014
Externally publishedYes

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Anions
Charge transfer
Photoluminescence
Rare Earth Metals
Negative ions
X ray diffraction
Solid state reactions
Phosphors
Powders
Energy transfer
Rare earths
Salts
Crystal structure
Single crystals
Fluxes
Metals
Chemical analysis

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

X-Ray diffraction and SAED characterisations of RE4O 4[PO4]Cl (RE = La, Pr, and Nd) and photoluminescence properties of Eu3+-doped La4O4[PO 4]Cl. / Yahia, Hamdi; Rodewald, Ute Ch; Feldmann, Claus; Roming, Marcus; Weill, François; Pöttgen, Rainer.

In: Journal of Materials Chemistry C, Vol. 2, No. 6, 14.02.2014, p. 1131-1140.

Research output: Contribution to journalArticle

Yahia, Hamdi ; Rodewald, Ute Ch ; Feldmann, Claus ; Roming, Marcus ; Weill, François ; Pöttgen, Rainer. / X-Ray diffraction and SAED characterisations of RE4O 4[PO4]Cl (RE = La, Pr, and Nd) and photoluminescence properties of Eu3+-doped La4O4[PO 4]Cl. In: Journal of Materials Chemistry C. 2014 ; Vol. 2, No. 6. pp. 1131-1140.
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abstract = "The new compounds RE4O4[PO4]Cl (RE = La, Nd, Sm and Gd) were synthesised by solid state reaction via a salt flux route and selected compositions were investigated by SAED, photoluminescence, and powder- and/or single crystal-X-ray diffraction. All the crystal structures consist of an alternation of [RE4O4]4+ and [ClPO4]4- layers. The [RE4O4] 4+ layer contains ORE4/4 tetrahedra which share common edges. In the tetragonal RE4O4[PO4]Cl (RE = Pr and Nd) compounds, the PO43- and Cl- anions are located between these layers in a disordered manner. This is reflected by the presence of diffuse streaks parallel to the c* axis on the SAED patterns. These lines disappear for larger rare earth metals and keep the place to well defined superstructure reflections in La4O4[PO 4]Cl, with a*superstructure = 4/5a*tetragonal - 2/5b*tetragonal and b*superstructure = 2/5a*tetragonal + 4/5b*tetragonal. The presence of these superstructure reflections is due to a new ordering of the PO43- and Cl- anions between the [RE4O4]4+ layers. The Eu 3+-doped La3PO7 and La4O 4[PO4]Cl samples show the characteristic Eu 3+-related 4f → 4f lines and intense emission of red light upon excitation via the O2- → Eu3+ charge-transfer band at 280 nm. Due to the efficient energy transfer from the charge-transfer state to the 4f-levels, especially, La4O4[PO4]Cl:Eu 3+ (5 mol{\%}) may be of potential interest as a red phosphor.",
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T1 - X-Ray diffraction and SAED characterisations of RE4O 4[PO4]Cl (RE = La, Pr, and Nd) and photoluminescence properties of Eu3+-doped La4O4[PO 4]Cl

AU - Yahia, Hamdi

AU - Rodewald, Ute Ch

AU - Feldmann, Claus

AU - Roming, Marcus

AU - Weill, François

AU - Pöttgen, Rainer

PY - 2014/2/14

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AB - The new compounds RE4O4[PO4]Cl (RE = La, Nd, Sm and Gd) were synthesised by solid state reaction via a salt flux route and selected compositions were investigated by SAED, photoluminescence, and powder- and/or single crystal-X-ray diffraction. All the crystal structures consist of an alternation of [RE4O4]4+ and [ClPO4]4- layers. The [RE4O4] 4+ layer contains ORE4/4 tetrahedra which share common edges. In the tetragonal RE4O4[PO4]Cl (RE = Pr and Nd) compounds, the PO43- and Cl- anions are located between these layers in a disordered manner. This is reflected by the presence of diffuse streaks parallel to the c* axis on the SAED patterns. These lines disappear for larger rare earth metals and keep the place to well defined superstructure reflections in La4O4[PO 4]Cl, with a*superstructure = 4/5a*tetragonal - 2/5b*tetragonal and b*superstructure = 2/5a*tetragonal + 4/5b*tetragonal. The presence of these superstructure reflections is due to a new ordering of the PO43- and Cl- anions between the [RE4O4]4+ layers. The Eu 3+-doped La3PO7 and La4O 4[PO4]Cl samples show the characteristic Eu 3+-related 4f → 4f lines and intense emission of red light upon excitation via the O2- → Eu3+ charge-transfer band at 280 nm. Due to the efficient energy transfer from the charge-transfer state to the 4f-levels, especially, La4O4[PO4]Cl:Eu 3+ (5 mol%) may be of potential interest as a red phosphor.

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