Microwave sol-gel synthesis, microstructural and spectroscopic properties of scheelite-type ternary molybdate upconversion phosphor NaPbLa(MoO4)3:Er3+/Yb3

• Published in: Journal of alloys and compounds Vol. 826; p. 152095
• Main Authors: Lim, Chang Sung, Aleksandrovsky, Aleksandr S., Atuchin, Victor V., Molokeev, Maxim S., Oreshonkov, Aleksandr S.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.06.2020; Elsevier BV
• Subjects: Chemical synthesis; Chromaticity; Cross relaxation; Crystal structure; Erbium; Lead molybdates; Molybdate; Optical materials; Phosphors; Raman spectroscopy; Scheelite; Sol-gel processes; Spectroscopy; Subsystems; Unit cell; Upconversion; X-ray diffraction; Ytterbium; X-ray diffraction; Optical materials; Chemical synthesis; Raman spectroscopy; Phosphors; Molybdate
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.152095

New ternary molybdate NaPbLa(1-x-y)(MoO4)3:xEr3+,yYb3+ (x = y = 0, x = 0.05 and y = 0.35, 0.4, 0.45 and 0.5) phosphors were successfully fabricated by the MSG (microwave sol-gel) method, and the microstructural and spectroscopic properties were characterized. The crystal structure of NaPbLa(MoO4)3 (NPLM) was defined by Rietveld analysis in space group I41/a with unit cell parameters a = 5.3735(2) and c = 11.8668(4) Å, V = 342.65(3) Å3, Z = 4 (RB = 6.64%). The unit cell volume of NaPbLa(MoO4)3 (NPLM) was intermediate between those of NaLa(MoO4)2 and PbMoO4. Under the 980 nm excitation, upconverted yellowish-green emissions at transitions from 2H11/2 and 4S3/2 were observed. No concentration quenching in the subsystem of donor ions at the content up to 50 at.% and no cross-relaxation losses in the subsystem of acceptor ions at the concentrations as high as 5 at. % were verified. The individual chromaticity points for the NaPbLa(MoO4)3:Er3+,Yb3+ phosphors, corresponding to the equal-energy point in the standard CIE diagram, revealed yellowish-green emissions. •New ternary molybdate NaPbLa(1-x-y)(MoO4)3:xEr3+,yYb3phosphors are fabricated by the microwave sol-gel method.•The crystal structure of NaPbLa(MoO4)3 (NPLM) is defined by Rietveld analysis in space group I41/a.•Under the 980 nm excitation, upconverted yellowish-green emissions at transitions from 2H11/2 and 4S3/2 are observed.