Multi-color emission evolution and energy transfer behavior of La3GaGe5O16:Tb3+,Eu3+ phosphors
A series of color-tunable green-red emitting La3GaGe5O16:Tb3+,Eu3+ phosphors were prepared by a high temperature solid-state reaction, and their phase structure and photoluminescence (PL) properties were investigated in detail. A series of characteristic emission lines originated from the f–f transitions of Tb3+ and Eu3+ can be observed from the PL spectra and the emission intensities' variation of the two strong emission lines peaking at around 544 nm (green) and 617 nm (red) induced the multi-color emission evolution via the fine tuning of the Tb3+/Eu3+ content ratio. The energy transfer process between Tb3+ and Eu3+ was demonstrated to be a resonant type via a dipole–dipole mechanism, and the crystal distance Rc calculated by the quenching concentration method and the spectral overlap method was 15.24 and 17.32 Å, respectively. Thermal quenching luminescence results reveal that La3GaGe5O16:Tb3+,Eu3+ exhibits good thermal stability.
- This article is part of the themed collection: 2014 Journal of Materials Chemistry C Hot Articles