Abstract
The optical up-conversion and down-conversion (or quantum cutting) processes in Ho3+/Yb3+ co-doped YVO4 and GdVO4 crystals, particularly cross relaxation and emission channels, were investigated with the help of magnetic fields. Cross-relaxation and emission channels were addressed with the help of magnetic field. The results demonstrated that cross relaxation processes between the donor Ho3+(Yb3+) ions and acceptor Yb3+(Ho3+) ions play positive roles in up-conversion, but negative roles in quantum cutting transitions. In addition, the conversion efficiency of the co-doped pairs depended on the hosts though could be distinctively modulated by a magnetic field. The results are helpful in understanding cross-relaxation processes and identifying the emissions originating in bi- (multi-) rare earth ion-doped luminescent materials, and also helpful in improving their efficiency in application.
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