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We are applying our recently developed optical fiber tip nano-tweezers for trapping of luminescent NaYF4:(Er, Yb, Gd) nanorods. The rods were prepared by a solvothermal route based on the reaction between metal and fluoride salts in a mixture of ethanol, water and oleic acid. By controlling the Gadolinium amount it was possible to elaboration rods with very different aspect ratios in the order of...