Green upconversion luminescence of Yb3+, Er3+ codoped NaLa(MoO4)2 phosphors
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The upconversion (UC) luminescence properties of polycrystalline Er3+/Yb3+ co-doped NaLa(MoO4)2 phosphors synthesized bya simple solid-state reaction method were investigated in detail. Under 980 nm excitation, Er3+/Yb3+ co-doped NaLa(MoO4)2exhibited weak red emissions near 660 and670 nm, and strong green UC emissions at 530 and550 nm corresponding to theintra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). The optimum doping concentration of Er3+ and Yb3+ for highestemission intensity was determined by XRD and PL analysis. The Er3+/Yb3+ (7.0/10.0 mol%) co-doped NaLa(MoO4)2 phosphorsample exhibited strongly shiny green emission. A possible UC mechanism for Er3+/Yb3+ co-doped NaLa(MoO4)2 dependingon the pump power dependence was discussed in detail.
Abstract
The upconversion (UC) luminescence properties of polycrystalline Er3+/Yb3+ co-doped NaLa(MoO4)2 phosphors synthesized bya simple solid-state reaction method were investigated in detail. Under 980 nm excitation, Er3+/Yb3+ co-doped NaLa(MoO4)2exhibited weak red emissions near 660 and670 nm, and strong green UC emissions at 530 and550 nm corresponding to theintra 4f transitions of Er3+ (4F9/2, 2H11/2, 4S3/2) → Er3+ (4I15/2). The optimum doping concentration of Er3+ and Yb3+ for highestemission intensity was determined by XRD and PL analysis. The Er3+/Yb3+ (7.0/10.0 mol%) co-doped NaLa(MoO4)2 phosphorsample exhibited strongly shiny green emission. A possible UC mechanism for Er3+/Yb3+ co-doped NaLa(MoO4)2 dependingon the pump power dependence was discussed in detail.
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