Journal
ACS NANO
Volume 6, Issue 10, Pages 8758-8766Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn302466r
Keywords
upconversion; nanophosphor; plasmonically enhanced emission; metal-enhanced absorption; lanthanide; atomic layer deposition; nanoimprint lithography
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Funding
- Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) on Optical Metamaterials [N00014-10-1-0942]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0002158]
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We have demonstrated amplification of luminescence in upconversion nanophosphors (UCNPs) of hexagonal phase NaYF4 (beta-NaYF4) doped with the lanthanide dopants Yb3+, Er3+ or Yb3+, Tm3+ by close proximity to metal nanoparticles (NPs). We present a configuration in which close-packed monolayers of UCNPs are separated from a dense multilayer of metal NPs (Au or Ag) by a nanometer-scale oxide grown by atomic layer deposition. Luminescence enhancements were found to be dependent on the thickness of the oxide spacer layer and the type of metal NP with enhancements of up to 5.2-fold proximal to Au NPs and of up to 45-fold proximal to Ag NPs. Concomitant shortening of the UCNP luminescence decay time and rise time is indicative of the enhancement of the UCNP luminescence induced by resonant plasmonic coupling and nonresonant near-field enhancement from the metal NP layer, respectively.
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