Upconversion multicolor tuning of NaY（WO₄）₂:Tb³⁺ with Eu³⁺ doping

Zhongxiang Shi，Jing Wang，Xin Guan

Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders,Dalian Jiaotong University

摘 要：A series of Tb³⁺ and Eu³⁺ co-doped NaY（WO₄）₂ phosphors were synthesized by hydrothermal reactions.The crystal structure,morphology,upconversion luminescent properties,the energy transfer from Tb³⁺ to Eu³⁺ions and the ⁵ D₄→ ⁷ F₅ transition of the Tb³⁺ ion in NaY（WO₄）₂:Tb³⁺,Eu³⁺ phosphors were investigated in details.The results indicate that all the synthesized samples are of pure tetragonal phase NaY（WO₄）2.Furthermore,the micrometer-sized needle spheres and excellent dispersion of the particles are obtained by adding polyethylene glycol（PEG-2000） as the surfactant.Phosphors of NaY（WO₄）₂:Tb³⁺,Eu³⁺ exhibit the492 nm blue emission peak,546 nm green emission peak,595 nm orange emission peak and 616 nm red emission peak under 790 nm excitation.The energy transfer from Tb³⁺ to Eu³⁺ is a resonant transfer,in which electric dipole-dipole interaction plays a leading role.By adjusting the doping concentration of Eu³⁺ in NaY（WO₄）₂: 1.0 mol%Tb³⁺,xmol%Eu³⁺ phosphors,the emitting color of UC phosphors can be tuned from green to red.

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