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http://dx.doi.org/10.6111/JKCGCT.2016.26.4.159

Upconversion luminescence from poly-crystalline Yb3+, Er3+ co-doped NaGd(MoO4)2 by simple solid state method  

Kang, Suk Hyun (Division of Materials Science and Engineering, Hanyang University)
Kang, Hyo Sang (Division of Materials Science and Engineering, Hanyang University)
Lee, Hee Ae (Division of Materials Science and Engineering, Hanyang University)
Shim, Kwang Bo (Division of Materials Science and Engineering, Hanyang University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.26, no.4, 2016 , pp. 159-163 More about this Journal
Abstract
Up-conversion (UC) luminescence properties of polycrystalline $Er^{3+}/Yb^{3+}$ doped $NaGd(MoO_4)_2$ phosphors synthesized by a simple solid-state reaction method were investigated in detail. Used to 980 nm excitation (InfraRed area), $Er^{3+}/Yb^{3+}$ co-doped $NaGd(MoO_4)_2$ exhibited very weak red emissions near 650 and 670 nm, and very strong green UC emissions at 540 and 550 nm corresponding to the infra 4f transitions of $Er^{3+}(^4F_{9/2},\;^2H_{11/2},\;^4S_{3/2}){\rightarrow}Er^{3+}(^4I_{15/2})$. The optimum doping concentration of $Er^{3+}$, $Yb^{3+}$ for highest emission intensity was determined by XRD and PL analysis. The $Er^{3+}/Yb^{3+}$ (10.0/10.0 mol%) co-doped $NaGd(MoO_4)_2$ phosphor sample exhibited very strong shiny green emission. A possible UC mechanism for $Er^{3+}/Yb^{3+}$ co-doped $NaGd(MoO_4)_2$ depending on the pump power dependence was discussed.
Keywords
Upconversion; $NaGd(MoO_4)_2$; Two-photon process; Rare earth ion;
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