A series of tunable emission phosphors of Sm³⁺, Eu³⁺ and Mn²⁺ doped Ba₃Tb(PO₄)₃: luminescence and energy transfer
2015
Li, Ting | Li, Panlai | Wang, Zhijun | Xu, Shuchao | Bai, Qiongyu | Yang, Zhiping
A series of activator Sm³⁺, Eu³⁺, Mn²⁺ ion doped Ba₃Tb(PO₄)₃ phosphors with tunable emitting color were synthesized via the high temperature solid state method. X-ray diffraction, luminescence and fluorescent decay curves were used to characterize the phosphors. The obtained powder crystallizes as a cubic unit cell with the space group Ī43d. Under 377 nm excitation of Tb³⁺, Ba₃Tb(PO₄)₃:Sm³⁺ not only presents ⁵D₄–⁷F₆–₃ of Tb³⁺ emission lines but also ⁴G₅/₂–⁶H₅/₂–₉/₂ of Sm³⁺ orange emission lines, Ba₃Tb(PO₄)₃:Eu³⁺ contains the emission lines of Tb³⁺ and Eu³⁺ (⁵D₀–⁷F₁–₄), and Ba₃Tb(PO₄)₃:Mn²⁺ exhibits the emission lines of Tb³⁺ and ⁴T₁–⁶A₁ orange emission band of Mn²⁺. In addition, the intensities of the red or orange-red emission can be enhanced by tuning the Sm³⁺, Eu³⁺ and Mn²⁺ contents. The intense emission intensities of Sm³⁺, Eu³⁺ and Mn²⁺ ions are attributed to the efficient energy transfer from Tb³⁺ to Sm³⁺, Eu³⁺ and Mn²⁺ ions, respectively, which have been justified through the luminescence spectra and fluorescence decay dynamics. The energy transfer mechanism was demonstrated to be the electric dipole–dipole interaction. For Ba₃Tb(PO₄)₃:Sm³⁺, Ba₃Tb(PO₄)₃:Eu³⁺ and Ba₃Tb(PO₄)₃:Mn²⁺, the best quantum efficiencies are 41.6%, 70.3% and 49.8%, respectively. The properties of the phosphors indicate that they may have potential application in UV-pumped white light emitting diodes.
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