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Plasmonic enhanced emissions from cubic NaYF4:Yb: Er/Tm nanophosphors

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Plasmonic enhanced emissions from cubic NaYF4:Yb: Er/Tm nanophosphors

Auteurs : L. Sudheendra [États-Unis] ; Volkan Ortalan [États-Unis] ; Sanchita Dey [États-Unis] ; Nigel D. Browning [États-Unis] ; I. M. Kennedy [États-Unis]

Source :

Chemistry of materials : a publication of the American Chemical Society [ 0897-4756 ] ; 2011.

RBID : PMC:3119558

Abstract

A metal shell was used in this study to provide significant enhancement of the up-converted emission from cubic NaYF₄ nanoparticles, creating a valuable composite material for labeling in biology and other applications – use of the cubic form of the material obviates the need to undertake a high temperature transformation to the naturally more efficient hexagonal phase. The NaYF₄ matrix contained ytterbium sensitizer and an Erbium (Er) or Thulium (Tm) activator. The particle sizes of the as-synthesized nanoparticles were in the range of 20–40 nm with a gold shell thickness of 4–8 nm. The gold shell was macroscopically amorphous. The synthesis method was based on a citrate chelation. In this approach, we exploited the ability of the citrate ion to act as a reductant and stabilizer. Confining the citrate ion reductant on the nanophosphor surface rather than in the solution was critical to the gold shell formation. The plasmonic shell enhanced the up-conversion emission of Tm from visible and near-infrared regions by up to a factor of 8, in addition to imparting a visible color arising from the plasmon absorption of the gold shell. The up-conversion enhancement observed with Tm and Er were different for similar gold coverages, with local crystal field changes as a possible route to enhance up-conversion emission from high symmetry structural hosts. These novel up-converting nanophosphor particles combine the phosphor and features of a gold shell, providing a unique platform for many biological imaging and labeling applications.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3119558

DOI: 10.1021/cm2006814
PubMed: 21709812
PubMed Central: 3119558

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 nanoparticles, creating a valuable composite material for labeling in biology and other applications – use of the cubic form of the material obviates the need to undertake a high temperature transformation to the naturally more efficient hexagonal phase. The NaYF<sub>4</sub>
 matrix contained ytterbium sensitizer and an Erbium (Er) or Thulium (Tm) activator. The particle sizes of the as-synthesized nanoparticles were in the range of 20–40 nm with a gold shell thickness of 4–8 nm. The gold shell was macroscopically amorphous. The synthesis method was based on a citrate chelation. In this approach, we exploited the ability of the citrate ion to act as a reductant and stabilizer. Confining the citrate ion reductant on the nanophosphor surface rather than in the solution was critical to the gold shell formation. The plasmonic shell enhanced the up-conversion emission of Tm from visible and near-infrared regions by up to a factor of 8, in addition to imparting a visible color arising from the plasmon absorption of the gold shell. The up-conversion enhancement observed with Tm and Er were different for similar gold coverages, with local crystal field changes as a possible route to enhance up-conversion emission from high symmetry structural hosts. These novel up-converting nanophosphor particles combine the phosphor and features of a gold shell, providing a unique platform for many biological imaging and labeling applications.</p>
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<aff id="A1"><label>a</label>
 Mechanical and Aerospace Engineering Department, University of California, Davis, 95616, USA</aff>
<aff id="A2"><label>b</label>
 Department of Chemical Engineering and Materials Science, University of California, Davis, 95616, USA</aff>
<author-notes><corresp id="FN1"><label>*</label>
Corresponding author; Tel, 530 752 2796; FAX, 2062022448; <email>imkennedy@ucdavis.edu</email>
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<pub-date pub-type="nihms-submitted"><day>30</day>
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<lpage>2993</lpage>
<abstract><p id="P1">A metal shell was used in this study to provide significant enhancement of the up-converted emission from cubic NaYF<italic><sub>4</sub>
</italic>
 nanoparticles, creating a valuable composite material for labeling in biology and other applications – use of the cubic form of the material obviates the need to undertake a high temperature transformation to the naturally more efficient hexagonal phase. The NaYF<sub>4</sub>
 matrix contained ytterbium sensitizer and an Erbium (Er) or Thulium (Tm) activator. The particle sizes of the as-synthesized nanoparticles were in the range of 20–40 nm with a gold shell thickness of 4–8 nm. The gold shell was macroscopically amorphous. The synthesis method was based on a citrate chelation. In this approach, we exploited the ability of the citrate ion to act as a reductant and stabilizer. Confining the citrate ion reductant on the nanophosphor surface rather than in the solution was critical to the gold shell formation. The plasmonic shell enhanced the up-conversion emission of Tm from visible and near-infrared regions by up to a factor of 8, in addition to imparting a visible color arising from the plasmon absorption of the gold shell. The up-conversion enhancement observed with Tm and Er were different for similar gold coverages, with local crystal field changes as a possible route to enhance up-conversion emission from high symmetry structural hosts. These novel up-converting nanophosphor particles combine the phosphor and features of a gold shell, providing a unique platform for many biological imaging and labeling applications.</p>
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<kwd-group><kwd>Cubic-NaYF<sub>4</sub>
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Plasmonic enhanced emissions from cubic NaYF4:Yb: Er/Tm nanophosphors

Plasmonic enhanced emissions from cubic NaYF4:Yb: Er/Tm nanophosphors

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Abstract

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