Sodium Controlled Synthesis of Hexagonal-Phase NaGdF4:Yb,Er Nanocrystals with Enhanced Upconversion Fluorescence for Bioimaging
In this study, we demonstrate a Na+ induced cubic-to-hexagonal phase transition in NaGdF4 nanocrystals. Based on such mechanism, a convenient method has been established to synthesize water-soluble and hexagonal-phase NaGdF4 nanocrystals by employing
excess Na+ ions in the ethylene glycol solvent. By co-doping Yb, Er or Yb, Tm ions, the synthesized NaGdF4:Yb,Er and NaGdF4:Yb,Tm nanocrystals exhibit bright upconversion fluorescence upon 980 nm diode laser excitation. This strategy will facilitate the synthesis
of hexagonal phase lanthanide-doped NaGdF4 nanocrystals with good biocompatibility for bioimaging applications.
Keywords: PHASE TRANSITION; PHOTOLUMINESCENCE; RARE-EARTH FLUORIDE NANOCRYSTALS; UPCONVERSION NANOPARTICLES
Document Type: Short Communication
Publication date: 01 February 2015
- Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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