New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts
This study shows the modification of photoluminescent properties (PL) of red-emitting β-Ca3(PO4)2-type (β-TCP) phosphor through anionic sublattice substitution. A new series of Eu3+-activated Ca9La(PO4)7(1–x)(VO4)7x were synthesized using the solid-state method. X-ray powder diffraction study shows...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
|
| Series: | Optical Materials: X |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590147825000233 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849228383890702336 |
|---|---|
| author | I.V. Nikiforov V.V. Titkov E.S. Zhukovskaya M.M. Klimenko E.A. Pankrushina А.А. Vasin D.V. Deyneko |
| author_facet | I.V. Nikiforov V.V. Titkov E.S. Zhukovskaya M.M. Klimenko E.A. Pankrushina А.А. Vasin D.V. Deyneko |
| author_sort | I.V. Nikiforov |
| collection | DOAJ |
| description | This study shows the modification of photoluminescent properties (PL) of red-emitting β-Ca3(PO4)2-type (β-TCP) phosphor through anionic sublattice substitution. A new series of Eu3+-activated Ca9La(PO4)7(1–x)(VO4)7x were synthesized using the solid-state method. X-ray powder diffraction study shows that all sample have β-TCP structure, however the differences in symmetry between the samples was found by second harmonic generation method. The unusual centrosymmetric structure appeared at 0.2 ≤ x ≤ 0.5 in Ca9La(PO4)7(1–x)(VO4)7x:Eu3+. Study of the series' photoluminescence properties revealed significant improvement in Eu3+-emission intensity for centrosymmetric samples. The PO4 ↔ VO4 substitution at 0.2 ≤ x ≤ 0.5 resulted in a 1.6-fold enhancement of Eu3+ photoluminescent properties. The emission intensity changes correspond to variations in the anionic part of the structure while maintaining constant activator concentration. The optical band-gap of the synthesized phosphors was estimated at ∼3 eV. Characteristic lifetimes decreased from 1.796 to 0.538 ms with increasing VO4 content. Quantum yields reached 34 % with just 1 mol.% of Eu3+. The crystal structure variation proposed here serves as an effective tool for improving photoluminescence properties of rare-earth ions. |
| format | Article |
| id | doaj-art-98960848fe6740b5a5b9b8e7522f377e |
| institution | Kabale University |
| issn | 2590-1478 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Optical Materials: X |
| spelling | doaj-art-98960848fe6740b5a5b9b8e7522f377e2025-08-23T04:49:03ZengElsevierOptical Materials: X2590-14782025-07-012710042110.1016/j.omx.2025.100421New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysaltsI.V. Nikiforov0V.V. Titkov1E.S. Zhukovskaya2M.M. Klimenko3E.A. Pankrushina4А.А. Vasin5D.V. Deyneko6Chemistry Department, Lomonosov Moscow State University, 119991, Moscow, RussiaChemistry Department, Lomonosov Moscow State University, 119991, Moscow, RussiaChemistry Department, Lomonosov Moscow State University, 119991, Moscow, RussiaChemistry Department, Lomonosov Moscow State University, 119991, Moscow, RussiaZavaritsky Institute of Geology and Geochemistry UB of RAS, 15 Vonsovsky Str., 620110, Ekaterinburg, RussiaInstitute of Solid State Chemistry, UB of RAS, 91, Pervomayskaya, 620990, Ekaterinburg, RussiaLaboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre RAS, 14 Fersman Str., 184209, Apatity, Russia; Chemistry Department, Lomonosov Moscow State University, 119991, Moscow, Russia; Corresponding author. Chemistry Department, Lomonosov Moscow State University, 119991, Moscow, Russia.This study shows the modification of photoluminescent properties (PL) of red-emitting β-Ca3(PO4)2-type (β-TCP) phosphor through anionic sublattice substitution. A new series of Eu3+-activated Ca9La(PO4)7(1–x)(VO4)7x were synthesized using the solid-state method. X-ray powder diffraction study shows that all sample have β-TCP structure, however the differences in symmetry between the samples was found by second harmonic generation method. The unusual centrosymmetric structure appeared at 0.2 ≤ x ≤ 0.5 in Ca9La(PO4)7(1–x)(VO4)7x:Eu3+. Study of the series' photoluminescence properties revealed significant improvement in Eu3+-emission intensity for centrosymmetric samples. The PO4 ↔ VO4 substitution at 0.2 ≤ x ≤ 0.5 resulted in a 1.6-fold enhancement of Eu3+ photoluminescent properties. The emission intensity changes correspond to variations in the anionic part of the structure while maintaining constant activator concentration. The optical band-gap of the synthesized phosphors was estimated at ∼3 eV. Characteristic lifetimes decreased from 1.796 to 0.538 ms with increasing VO4 content. Quantum yields reached 34 % with just 1 mol.% of Eu3+. The crystal structure variation proposed here serves as an effective tool for improving photoluminescence properties of rare-earth ions.http://www.sciencedirect.com/science/article/pii/S2590147825000233Luminescent materialsEu dopingPhosphate phosphorsVanadateWhitlockiteb-TCP |
| spellingShingle | I.V. Nikiforov V.V. Titkov E.S. Zhukovskaya M.M. Klimenko E.A. Pankrushina А.А. Vasin D.V. Deyneko New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts Optical Materials: X Luminescent materials Eu doping Phosphate phosphors Vanadate Whitlockite b-TCP |
| title | New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts |
| title_full | New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts |
| title_fullStr | New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts |
| title_full_unstemmed | New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts |
| title_short | New type of symmetry inhomogeneity in β-TCP-type phosphors: symmetrical features of mixed oxysalts |
| title_sort | new type of symmetry inhomogeneity in β tcp type phosphors symmetrical features of mixed oxysalts |
| topic | Luminescent materials Eu doping Phosphate phosphors Vanadate Whitlockite b-TCP |
| url | http://www.sciencedirect.com/science/article/pii/S2590147825000233 |
| work_keys_str_mv | AT ivnikiforov newtypeofsymmetryinhomogeneityinbtcptypephosphorssymmetricalfeaturesofmixedoxysalts AT vvtitkov newtypeofsymmetryinhomogeneityinbtcptypephosphorssymmetricalfeaturesofmixedoxysalts AT eszhukovskaya newtypeofsymmetryinhomogeneityinbtcptypephosphorssymmetricalfeaturesofmixedoxysalts AT mmklimenko newtypeofsymmetryinhomogeneityinbtcptypephosphorssymmetricalfeaturesofmixedoxysalts AT eapankrushina newtypeofsymmetryinhomogeneityinbtcptypephosphorssymmetricalfeaturesofmixedoxysalts AT aavasin newtypeofsymmetryinhomogeneityinbtcptypephosphorssymmetricalfeaturesofmixedoxysalts AT dvdeyneko newtypeofsymmetryinhomogeneityinbtcptypephosphorssymmetricalfeaturesofmixedoxysalts |