DEFECTS INDUCED ENHANCEMENT OF EU3-EU3+)( EMISSION IN YTTRIA (Y2O3)

Bixbyite type Y2O3:Eu3+ apart from being the efficient red phosphor ex tensively used in trichromatic fluorescent lamps, it is a typical syst em one can apply Jorgensen's refined electron spin pairing theory. Thi s can be used to explain the enhancement in Eu3+ emission intensity ob served with the aliovalent substitution in the yttria host matrix. Res ults based on these are explained qualitatively by considering a simpl e configurational coordinate model. Futhermore, an insight into the di fferent types of defects induced with the aliovalent substitution in t he yttria lattice has become possible with EPR probe.