Abstract
The Yb3+/Tm3+/Ho3+: Gd3Ga5O12 nano-crystals have been successfully prepared via a citric acid complex procedure. The luminescence spectra were measured and the up-conversion processes were discussed. By means of adjusting the doping concentrations of Yb3+/Tm3+/Ho3+, the red-green-blue up-conversion luminescence changed obviously. Results indicated that the ratio of red-green-blue up-conversion emissions enhanced heavily with the increasing concentrations of Tm3+ doped in the Yb3+/Tm3+/Ho3+:Gd3Ga5O12 nano-crystals, which was rooted in the three-photon resonant cross relaxation processes(1G4 (Tm)+5I7 (Ho)→3H5 (Tm)+5S2 (Ho)). The tunable red-green-blue luminescence could be used in the fields of display, illumination, and photonics such as the white light generation.
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