Articles
  • Green upconversion luminescence of Yb3+, Er3+ co-doped NaLa(MoO4)2 phosphors
  • Jeong Ho Ryua, Suk Hyun Kangb and Kwang Bo Shimb,*
  • a Department of Materials Science and Engineering, Korea National University of Transportation, Chungbuk 380-702, Korea b Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Abstract
The upconversion (UC) luminescence properties of polycrystalline Er3+/Yb3+ co-doped NaLa(MoO4)2 phosphors synthesized by a simple solid-state reaction method were investigated in detail. Under 980 nm excitation, Er3+/Yb3+ co-doped NaLa(MoO4)2 exhibited weak red emissions near 660 and670 nm, and strong green UC emissions at 530 and550 nm corresponding to the intra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2)→Er3+ (4I15/2). The optimum doping concentration of Er3+ and Yb3+ for highest emission intensity was determined by XRD and PL analysis. The Er3+/Yb3+ (7.0/10.0 mol%) co-doped NaLa(MoO4)2 phosphor sample exhibited strongly shiny green emission. A possible UC mechanism for Er3+/Yb3+ co-doped NaLa(MoO4)2 depending on the pump power dependence was discussed in detail.

Keywords: Green upconversion, NaLa(MoO4)2, Two-photon process.

This Article

  • 2016; 17(3): 253-256

    Published on Mar 31, 2016

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