BaGdB~9O~16中Dy^3+的发光和Ce^3+, Gd^3+驿Dy^3+的能量传递

我们研究了在紫外光(UV)激发下, Dy^3+单掺杂和Ce^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。Ce^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+)~n→Dy^3+形式传递给Dy^3+。Ce^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-电四级相互作用。

Luminescence and energy transfer of Ce^3+, Gd^3+ and Dy^3+ in BaGdB~9O~16

The photoluminescence of Dy3+ singly doped BaGdB9O16 samples or Ce3+ and Dy3+ co-doped BaGdB9O16 samples excited by UV light and the dependence of Ce3+ and Dy3+ luminescent intensities on these compns. were studied. The results indicate that both Ce3+ and Gd3+ can sensitize the luminescence of Dy3+; the energy of Dy3+ emission originated mostly from the Ce3+ ion, which absorbs the excitation energy by its f-d transition. The other parts of the energy are derived from the Gd3+ ion. The mechanism of the energy transfer from Ce3+ to Dy3+ was studied. There is a resonant transfer elec. dipole-dipole interaction. The dependence is discussed of the luminescent intensities on the concentration of Dy3+ in BaGdB9O16:Dy3+ under the excitation at 348 nm. The mechanism of concentration self-quenching of Dy3+ is an elec. dipole-quadrupole interaction.