Sodium controlled synthesis of hexagonal-phase NaGdF4:Yb,Er nanocrystals with enhanced upconversion fluorescence for bioimaging

Fei Qi; Liang Bo Liang; Da Quan Zhang; Xue Feng Yu

doi:10.1166/nnl.2015.1904

Sodium controlled synthesis of hexagonal-phase NaGdF₄:Yb,Er nanocrystals with enhanced upconversion fluorescence for bioimaging

Fei Qi, Liang Bo Liang, Da Quan Zhang, Xue Feng Yu

Nanomaterials Theory Institute

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	121-126
Number of pages	6
Journal	Nanoscience and Nanotechnology Letters
Volume	7
Issue number	2
DOIs	https://doi.org/10.1166/nnl.2015.1904
State	Published - Feb 1 2015

Keywords

Phase transition
Photoluminescence
Rare-earth fluoride nanocrystals
Upconversion nanoparticles

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title = "Sodium controlled synthesis of hexagonal-phase NaGdF4:Yb,Er nanocrystals with enhanced upconversion fluorescence for bioimaging",

abstract = "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",

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AU - Qi, Fei

AU - Liang, Liang Bo

AU - Zhang, Da Quan

AU - Yu, Xue Feng

PY - 2015/2/1

Y1 - 2015/2/1

N2 - 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.

AB - 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.

KW - Phase transition

KW - Photoluminescence

KW - Rare-earth fluoride nanocrystals

KW - Upconversion nanoparticles

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DO - 10.1166/nnl.2015.1904

M3 - Article

AN - SCOPUS:84929848884

SN - 1941-4900

VL - 7

SP - 121

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JO - Nanoscience and Nanotechnology Letters

JF - Nanoscience and Nanotechnology Letters

IS - 2

ER -

Sodium controlled synthesis of hexagonal-phase NaGdF₄:Yb,Er nanocrystals with enhanced upconversion fluorescence for bioimaging

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Keywords

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