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

New ternary molybdate NaPbLa(1-x-y)(MoO4)(3):xEr(3+),yYb(3+) (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 I4(1)/a with unit cell parameters a = 5.3735(2) and c = 11.8668(4) angstrom, V = 342.65(3) angstrom(3), Z = 4 (R-B = 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 H-2(11/2) and S-4(3/2) 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. (C) 2019 Published by Elsevier B.V.