Investigation of 515 nm green-light emission for full color emission LaAlO3 phosphor with varied valence Eu

Photoluminescence and lifetime decay properties of varied valence Eu were employed to investigate the luminescence mechanism of green-light emission positioned at ∼515 nm for full color emission LaAlO3 phosphor co-doped with Eu2+ and Eu3+. The enhanced 5D2→7F3 transition emission of Eu3+ was assigned for this green emission. Energy transfer between Eu2+ and 5D2 level of Eu3+ was proposed, which results in the enhancement of 5D2→7F3 transition emission. In addition, energy transfer relations between host-Eu and charge transfer state (CTS)-Eu were also discussed associated with the PLE spectra and band schemes.