Abstract
Nd3+/Yb3+/Tm3+ tri-doped CaTeO3 compounds were prepared by a solid-state reaction method. Bright blue up-conversion (UC) luminescence at around 476 nm, which corresponds to the Tm3+: 1G4 → 3H6 transition, was observed under 808-nm excitation. The Nd3+ → Yb3+ → Tm3+ energy transfer process was responsible for the strong blue up-conversion emission in the tri-doped phosphor. The Tm3+ blue up-conversion emission intensity was strongly dependent on the concentrations of Yb3+ and Nd3+. The possible up-conversion mechanisms for the Nd3+/Yb3+/Tm3+ tri-doped CaTeO3 phosphor are discussed, based on the Nd3+ and Yb3+ concentration-dependent UC spectra, near-infrared luminescence spectra and luminescence decay curves.
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