Electric dipole red emission in Eu³⁺-doped low bandgap oxide LiInO<inf>2</inf>

Eu3+ -doped LiInO2 phosphors have been synthesized by solid-state reaction at 1000°C and characterized by powder X-ray diffraction and photoluminescence studies. These phosphors show emission lines of Eu3+ corresponding to D5 0 - F7 J (J=1,2) transitions under 466 nm excitation. Among these emission transitions, the D5 0 - F7 2 electric dipole transition at 614 nm is the predominant one. The critical concentration of Eu3+ is x=0.05 in LiIn1-x Eux O2, beyond which concentration quenching is observed. The emission intensity of LiIn0.95 Eu0.05 O2 phosphor is ∼1.3 times that of Y2 O2 S: Eu3+ (Nichia). © 2008 The Electrochemical Society.