Publication Date:
2011-06-25
Description:
Using a convenient solid-state reaction Ce 0.67 Tb 0.33 Mg 1- x Mn x Al 11 O 19 green phosphors were prepared. The effect of Mn 2+ 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 Mn 2+ 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 Mn 2+ doping content was increased from 0 to 0.12, the energy transfer efficiency (Ce 3+ ,Tb 3+ → Mn 2+ ) gradually increased from 0% to 58%. The Ce 0.67 Tb 0.33 Mg 0.88 Mn 0.12 Al 11 O 19 sample exhibits 105% of the standard NTSC color gamut. Results indicate that Ce 0.67 Tb 0.33 Mg 0.88 Mn 0.12 Al 11 O 19 green phosphors can be applied to illumination devices and displays.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
