Energy transfer mechanism and luminescence of Ce_0.67Tb _0.33Mg_1-xMn_xAl₁₁O₁₉ wide-color-gamut CCFL green phosphor

Using a convenient solid-state reaction Ce_0.67Tb _0.33Mg_1-xMn_xAl₁₁O₁₉ green phosphors were prepared. The effect of Mn²⁺ doping on the luminescence properties, energy transfer mechanism, and color gamut under 254 nm excitation were investigated. The energy transfer from (Ce,Tb)³⁺ to Mn²⁺ was found to be due to multipolar interactions of the dipole-quadrupole mechanism from theoretical fitting results. The critical distance was calculated to be 0.797 nm. When the Mn²⁺ doping content was increased from 0 to 0.12, the energy transfer efficiency (Ce ³⁺,Tb³⁺ → Mn²⁺) gradually increased from 0% to 58%. The Ce_0.67Tb_0.33Mg_0.88Mn _0.12Al₁₁O₁₉ sample exhibits 105% of the standard NTSC color gamut. Results indicate that Ce_0.67Tb _0.33Mg_0.88Mn_0.12Al₁₁O₁₉ green phosphors can be applied to illumination devices and displays.