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Non-Linear Density Dependent Upconversion Luminescence Enhancement of β-NaYF4: Yb3+: Er3+ Nanoparticles on Random Ag Nanowire Aggregates

Published online by Cambridge University Press:  16 May 2016

Amy Hor ,
Quoc Anh N. Luu ,
P. Stanley May ,
Mary Berry  and
Steve Smith
Amy Hor
Affiliation:
Nanoscience and Nanoengineering, South Dakota School of Mines and Technology Rapid City, SD 57701
Quoc Anh N. Luu
Affiliation:
Nanoscience and Nanoengineering, South Dakota School of Mines and Technology Rapid City, SD 57701
P. Stanley May
Affiliation:
Department of Chemistry, University of South Dakota Vermillion, SD 57069
Mary Berry
Affiliation:
Department of Chemistry, University of South Dakota Vermillion, SD 57069
Steve Smith*
Affiliation:
Nanoscience and Nanoengineering, South Dakota School of Mines and Technology Rapid City, SD 57701
*
*(Email: [email protected])
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Abstract

Spectroscopic imaging and statistical analysis of NIR-to-visible upconversion luminescence (UCL) from β-NaYF4:Yb3+:Er3+ upconverting nanoparticles (UCNPs) supported on a series of random Ag nanowire aggregates reveals a density dependent UCL enhancement. Statistical analysis of the spectrally resolved upconversion images shows a non-linear dependence of upconversion luminescence enhancement with Ag nanowire surface coverage. A maximum average enhancement of 5.8× was observed for 58% surface coverage. Based on the empirically determined trend with density, it is estimated that up to 20× upconversion luminescence enhancement can be achieved at 100% surface coverage, even at high excitation intensity. This projection is commensurate with the 20× enhancement ratio observed for select locations within the imaged micro-ensemble. Time-resolved emission of the UC luminescence from UCNPs on the Ag nanowire aggregates confirms the surface plasmon effects on the UCNPs kinetics. Such Ag nanowire aggregates show potential as a scalable and relatively simple metal-enhanced upconversion substrate.

Keywords

YbErlanthanide
Type
Articles
Information
MRS Advances , Volume 1 , Issue 38: Materials Design , 2016 , pp. 2677 - 2682
Copyright
Copyright © Materials Research Society 2016 

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References

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