Ce³⁺,Tb³⁺,Eu³⁺,Mn²⁺-doped and Codoped NaY₉(SiO₄)₆O₂Phosphors: Luminescence, Energy Transfer, Tunable Color Properties

We have synthesized a series of (Ce3+,Tb3+,Eu3+) singly doped & (Ce3+/Tb3+, Ce3+/Mn2+) codoped NaY9(SiO4)6O2 phosphors via high temperature solid state reaction and investigated their crystal structures and luminescent properties in detail. The singly doped phosphors exhibit the characteristic emission of activators under UV excitation, respectively. And the decay curves can be fitted well by the two exponential functions, which is consistent with the presence of two various Y3+ sites in the host. On the basis of the photoluminescence emission spectra of codoped NaY9(SiO4)6O2 samples, we clearly observed the sensitizing effects from the Ce3+ ions to the Tb3+ or Mn2+ ions and coarsely calculated the energy transfer efficiency. Furthermore, the color tune of these codoped NaY9(SiO4)6O2 phosphors can be easily obtained by adjusting the relative content between the Ce3+ and Tb3+/Mn2+.