Color tunable luminescence from LaAlO3:Bi3+, Ho3+ doped phosphors for field emission displays

Bi 3+ -activated LaAlO 3 :Ho 3+ Phosphor, was prepared by Polyol method, and its photoluminescent properties were investigated under (UV) light excitation. Luminescence studies indicated that optimum concentration of Bi 3+ and Ho 3+ in LaAlO 3 was found to be 1 and 1.5 at.%. The luminescent intensity of Ho 3+ emission lines was remarkably enhanced on exciting with 272 nm, which suggested that efficient energy transfer from Bi 3+ ions to Ho 3+ ions takes place. There is significant energy overlap between the emission band of Bi 3+ ions and the excitation band of Ho 3+ ions.The ET efficiency has been calculated and found to be 69%. The critical ET distance has been calculated by the concentration–quenching method. The enhanced intensity and tuned luminous color of LaAlO 3 : Bi 3+ /Ho 3+ phosphors from blue to cyan provides a promising material for field emission display devices.