Plasmonic enhanced emissions from cubic NaYF4

Yb:Er/Tm nanophosphors

L. Sudheendra, Volkan Ortalan, Sanchita Dey, Nigel D. Browning, Ian M. Kennedy

Research output: Contribution to journalArticle

102 Citations (Scopus)

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 enhancements 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.

Original languageEnglish (US)
Pages (from-to)2987-2993
Number of pages7
JournalChemistry of Materials
Volume23
Issue number11
DOIs
StatePublished - Jun 14 2011

Fingerprint

Thulium
Erbium
Gold
Citric Acid
Reducing Agents
Labeling
Ytterbium
Ions
Nanoparticles
Chelation
Phosphors
Metals
Particle size
Color
Infrared radiation
Imaging techniques
Crystals
Composite materials

Keywords

  • citrate method
  • Cubic-NaYF
  • gold coating
  • plasmonic enhancement
  • up-conversion emission
  • up-converting nanophosphor

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Sudheendra, L., Ortalan, V., Dey, S., Browning, N. D., & Kennedy, I. M. (2011). Plasmonic enhanced emissions from cubic NaYF4: Yb:Er/Tm nanophosphors. Chemistry of Materials, 23(11), 2987-2993. https://doi.org/10.1021/cm2006814

Plasmonic enhanced emissions from cubic NaYF4 : Yb:Er/Tm nanophosphors. / Sudheendra, L.; Ortalan, Volkan; Dey, Sanchita; Browning, Nigel D.; Kennedy, Ian M.

In: Chemistry of Materials, Vol. 23, No. 11, 14.06.2011, p. 2987-2993.

Research output: Contribution to journalArticle

Sudheendra, L, Ortalan, V, Dey, S, Browning, ND & Kennedy, IM 2011, 'Plasmonic enhanced emissions from cubic NaYF4: Yb:Er/Tm nanophosphors', Chemistry of Materials, vol. 23, no. 11, pp. 2987-2993. https://doi.org/10.1021/cm2006814
Sudheendra L, Ortalan V, Dey S, Browning ND, Kennedy IM. Plasmonic enhanced emissions from cubic NaYF4: Yb:Er/Tm nanophosphors. Chemistry of Materials. 2011 Jun 14;23(11):2987-2993. https://doi.org/10.1021/cm2006814
Sudheendra, L. ; Ortalan, Volkan ; Dey, Sanchita ; Browning, Nigel D. ; Kennedy, Ian M. / Plasmonic enhanced emissions from cubic NaYF4 : Yb:Er/Tm nanophosphors. In: Chemistry of Materials. 2011 ; Vol. 23, No. 11. pp. 2987-2993.
@article{da9ef6a08e8240e596018bb3a15d89dc,
title = "Plasmonic enhanced emissions from cubic NaYF4: Yb:Er/Tm nanophosphors",
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 enhancements 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.",
keywords = "citrate method, Cubic-NaYF, gold coating, plasmonic enhancement, up-conversion emission, up-converting nanophosphor",
author = "L. Sudheendra and Volkan Ortalan and Sanchita Dey and Browning, {Nigel D.} and Kennedy, {Ian M.}",
year = "2011",
month = "6",
day = "14",
doi = "10.1021/cm2006814",
language = "English (US)",
volume = "23",
pages = "2987--2993",
journal = "Chemistry of Materials",
issn = "0897-4756",
publisher = "American Chemical Society",
number = "11",

}

TY - JOUR

T1 - Plasmonic enhanced emissions from cubic NaYF4

T2 - Yb:Er/Tm nanophosphors

AU - Sudheendra, L.

AU - Ortalan, Volkan

AU - Dey, Sanchita

AU - Browning, Nigel D.

AU - Kennedy, Ian M.

PY - 2011/6/14

Y1 - 2011/6/14

N2 - 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 enhancements 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.

AB - 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 enhancements 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.

KW - citrate method

KW - Cubic-NaYF

KW - gold coating

KW - plasmonic enhancement

KW - up-conversion emission

KW - up-converting nanophosphor

UR - http://www.scopus.com/inward/record.url?scp=79958851691&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79958851691&partnerID=8YFLogxK

U2 - 10.1021/cm2006814

DO - 10.1021/cm2006814

M3 - Article

VL - 23

SP - 2987

EP - 2993

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 11

ER -