Abstract
The room temperature luminescence properties of Pr3+-doped gadolinium gallium garnet (GGG:Pr3+, Gd3Ga5O12:Pr3+) nanocrystals (0.1, 1, 5 and 10 mol %) were evaluated. Increasing the Pr3+ concentration in the nanocrystals resulted in a decrease of the 3P0 emission to lower lying states via the [3P0,3H4] → [3H6,1D2] cross-relaxation (CR) process. Similarly, a decrease in the 1D2 emission was observed and was attributed to the [1D2,3H4] → [1G4,3F3,4] cross-relaxation mechanism. The increase in cross-relaxation efficiency on increasing the Pr3+ concentration was attributed to the smaller average interionic distances between the dopant ions. Dominant blue/green emission due to the 3P0 → 3H4 and 3P0 → 3H6 transitions was observed after laser excitation at 457.9 nm for Pr3+/Yb3+ codoped nanocrystalline GGG samples. The blue/green emission decreased as the sensitizer (Yb3+) concentration increased in the GGG samples. The observed near-infrared (NIR) 2F5/2 → 2F7/2 emission from the Yb3+ ion, upon 457.9 nm excitatio...
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