title: Triple molybdate scheelite-type upconversion phosphor NaCaLa(MoO4)3:Er3+/Yb3+: structural and spectroscopic properties.
abstract: Triple molybdate NaCaLa(1-x-y)(MoO4)3:xEr3+,yYb3+(x = y = 0, x = 0.05 and y = 0.45, x = 0.1 and y = 0.2, x = 0.2 and y = 0) phosphors were successfully synthesized for the first time by the microwave sol-gel method. Well-crystallized particles formed after heat treatment at 900 °C for 16 h showed a fine and homogeneous morphology with particle sizes of 2-3 μm. The structures were refined by the Rietveld method in the space group I41/a. The optical properties were examined comparatively using photoluminescence emission and Raman spectroscopy. Under excitation at 980 nm, the NaCaLa0.7(MoO4)3:0.1Er3+,0.2Yb3+and NaCaLa0.5(MoO4)3:0.05Er3+,0.45Yb3+particles exhibited a strong 525 nm emission band, a weaker 550 nm emission band in the green region, and three weak 655 nm, 490 nm and 410 nm emission bands in the red, blue and violet regions. The pump power dependence and Commission Internationale de L'Eclairage chromaticity of the upconversion emission intensity were evaluated in detail.
authors.affiliation: Department of Advanced Materials Science & Engineering, Hanseo University, Seosan 356-706, Republic of Korea.
authors.forename: Chang Sung
authors.initials: CS
authors.lastname: Lim
authors.affiliation: Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia and Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk 660079, Russia.
authors.forename: Aleksandr S
authors.initials: AS
authors.lastname: Aleksandrovsky
authors.affiliation: Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia and Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia.
authors.forename: Maxim S
authors.initials: MS
authors.lastname: Molokeev
authors.affiliation: Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia and Department of Photonics and Laser Technologies, Siberian Federal University, Krasnoyarsk 660079, Russia.
authors.forename: Aleksandr S
authors.initials: AS
authors.lastname: Oreshonkov
authors.affiliation: Department of Photonics and Laser Technologies, Siberian Federal University, Krasnoyarsk 660079, Russia.
authors.forename: Denis A
authors.initials: DA
authors.lastname: Ikonnikov
authors.affiliation: Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia. atuchin@isp.nsc.ru and Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia and Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk 630090, Russia and Institute of Chemistry, Tyumen State University, Tyumen 525003, Russia.
authors.forename: Victor V
authors.initials: VV
authors.lastname: Atuchin