Tunable luminescence and energy transfer in Eu3+ doped Ca8MTb(PO4)7 (M = Mg, Zn, Ca) phosphors. (October 2020)

• Record Type: Journal Article
• Authors: Nikiforov, Ivan V.; Deyneko, Dina V.; Spassky, Dmitry A.; Baryshnikova, Oksana V.; Stefanovich, Sergey Yu.; Lazoryak, Bogdan I.
• Is Part Of: Materials research bulletin. Volume 130(2020)
• Publication Date: 2020-10
• Subjects: Tunable luminescence -- Tb3+and Eu3+ -- Phosphate -- β-Ca3(PO4)2-type structure -- Energy transfer -- Tb3+/Eu3+; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.110925
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: New solid solutions Ca8 M Tb1 –x Eu x (PO4 )7 ( M = Mg 2+, Zn 2+, Ca 2+ ; 0 ≤ x ≤ 1) were synthesized and studied in detail. The highest integral intensity was registered for Zn doped host and increases the luminescence intensity by 15%. The effective energy transfer from Tb 3+ → Eu 3+ was detected and characterized. Synthesized samples are perspective single-phase phosphors. Abstract: A series of Ca8 M Tb1 –x Eu x (PO4 )7 ( M = Mg 2+, Zn 2+, Ca 2+ ; 0 ≤ x ≤ 1) with β-Ca3 (PO4 )2 -type structure have been synthesized via a standard solid-state method. X-ray diffraction, second harmonic generation, photoluminescence emission and excitation spectra, and decay time curves were used to characterize solid solutions. The color coordinates of as -prepared samples can be shifted from green to red regions by the increasing of Eu 3+ concentration. Red-to-orange (R/O) and green-to-blue (G/B) factors indicate a higher local symmetry of emitting Eu 3+ and Tb 3+ ions environment in Ca8 M Tb1– x Eu x (PO4 )7 ( M = Mg, Zn) in comparison to Ca9 Tb1 –x Eu x (PO4 )7 . The study shows that Zn-incorporation in the β-Ca3 (PO4 )2 matrix increases the luminescence intensity by 15%. The presented results indicate that the synthesized solid solutions can be considered as new single-phase phosphors.