BaGdB_9O_(16)中Dy^(3+)的发光和Ce^(3+),Gd^(3+)对Dy^(3+)的能量传递

Luminescence and Energy Transfer of Ce^(3+), Gd^(3+) and Dy^(3+) in BaGdB_9O_(16)

我们研究了在紫外光(UV)激发下,Dy^(3+)单掺杂和Ge^(3+),Dy^(3+)共掺杂的BaGdB_9O_(16)的发射光谱、激发光谱及发光强度随组成变化的规律性,发现Ce^(3+),Gd^(3+)均对Dy^(3+)的发光起敏化作用。Ge^(3+)吸收的能量大部分直接传递给Dy^(3+),小部分以Ce^(3+)→Gd^(3+)→(Gd^(3+))→Dy^(3+)形式传递给Dy^(3+)。Ge^(3+)→Dy^(3+)能量传递和Dy^(3+)自身浓度猝灭机理分别为电偶极-电偶极和电偶极-电四级枇互作用。

The photoluminescence of Dy^(3+) mono-doped BaGdB_9O_(16) samples or Ce^(3+) and Dy^(3+) codoped BaGdB_9O_(16) samples excited by UV light and the dependence of Ce^(3+) and Dy^(3+) luminescent intensities on compositions have been studied. The results obtained indicate that both Ce^(3+) and Gd^(3+) can sensitize the luminescence of Dy^(3+), the energy of Dy^(3+) emission originated mostly from Ce^(3+) ion, which absorbs the excitation energy by its f-d transition. The other parts of energy is via the Gd^(3+) ion. The mechanism of the energy transfer from Ce^(3+) to Dy^(3+) has been studied. It is concluded that there is a resonant transfer electric dipole-dipole interaction. According to the dependence of the luminescent intensities on the concentration of Dy^(3+) in BaGdB_9O_(16): Dy^(3+) under the excitation 348nm. It has been confirmed that the mechanism of concentration selfquenching of Dy^(3+) is an electric dipole-quadrupole interaction.