Journal
ACS NANO
Volume 8, Issue 9, Pages 9482-9491Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn503675a
Keywords
upconversion nanocrystals; template-assisted self-assembly; plasmon-enhanced luminescence; single particle; gold nanorod; polarization dependence
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Funding
- NSF MRSEC [DMR-1120901]
- Office of Naval Research Multidisciplinary University Research Initiative Award [ONR-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 demonstrate plasmonic enhancement of upconversion luminescence in individual nanocrystal heterodimers formed by template-assisted self-assembly. Lithographically defined, shape-selective templates were used to deterministically coassemble single Au nanorods in proximity to single hexagonal (beta-phase) NaYF4:Yb3+, Er3+ upconversion nanophosphors. By tailoring the dimensions of the rods to spectrally tune their longitudinal surface plasmon resonance to match the 977 nm excitation wavelength of the phosphors and by spatially localizing the phosphors in the intense near-fields surrounding the rod tips, several-fold luminescence enhancements were achieved. The enhancement effects exhibited a strong dependence on the excitation light's polarization relative to the rod axis. In addition, greater enhancement was observed at lower excitation power densities due to the nonlinear behavior of the upconversion process. The template-based coassembly scheme utilized here for plasmonic coupling offers a versatile platform for improving our understanding of optical interactions among individual chemically prepared nanocrystal components.
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