Energy transfer behavior and tunable spectroscopic properties of Ba3Lu4O9:Dy3+,Eu3+ phosphors for white LEDs

Ba 3 Lu 4 O 9 :Dy 3+ ,Eu 3+ phosphors were developed through the conventional solid-state reaction. Luminescent performance including the energy transfer from dysprosium to europium , spectral tunability, fluorescent lifetime and thermal quenching behavior of the as-studied phosphors was studied. The characteristic emission of Dy 3+ and Eu 3+ were detected in Ba 3 Lu 4 O 9 :Dy 3+ ,Eu 3+ upon the excitation at various ultraviolet–visible wavelengths. The critical distance between dysprosium and europium ions was evaluated to be about 16.05 Å. The energy transfer from dysprosium to europium in Ba 3 Lu 4 O 9 can be attributed to the dipole-quadruple mechanism, and the efficiency was evaluated to be 81.8% for Ba 3 Lu 3.52 O 9 :0.16Dy 3+ ,0.32Eu 3+ . The tunable warm-white emission and high thermal stability reveal that the as-studied phosphor can be an auspicious alternative for white LEDs application.