Abstract
Branched polyethylenimine(B-PEI) coated NaYF4∶Yb3+,Er3+ nanoparticles with size about 45 nm were successfully prepared via a solvothermal method in water and diethylene glycol using B-PEI as surfactant.The strong upconversion luminescence from the sample can be observed under excitation of 980 nm diode laser at room temperature.The amino groups of B-PEI existing on the nanoparticles can be used for attachment of biomolecules.The cell viability experiments show that the samples have lower cell toxicity.The results presented in this study provide a new insight for the upconversion luminescence nanoparticles in the biomedical applications.
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