TY - JOUR
T1 - Plasmon-enhanced upconversion luminescence in single nanophosphor-nanorod heterodimers formed through template-assisted self-assembly
AU - Greybush, Nicholas J.
AU - Saboktakin, Marjan
AU - Ye, Xingchen
AU - Della Giovampaola, Cristian
AU - Oh, Soong Ju
AU - Berry, Nathaniel E.
AU - Engheta, Nader
AU - Murray, Christopher B.
AU - Kagan, Cherie R.
PY - 2014/9/23
Y1 - 2014/9/23
N2 - 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 (β-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 lights 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.
AB - 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 (β-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 lights 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.
KW - gold nanorod
KW - plasmon-enhanced luminescence
KW - polarization dependence
KW - single particle
KW - template-assisted self-assembly
KW - upconversion nanocrystals
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U2 - 10.1021/nn503675a
DO - 10.1021/nn503675a
M3 - Article
C2 - 25182662
AN - SCOPUS:84912548464
SN - 1936-0851
VL - 8
SP - 9482
EP - 9491
JO - ACS nano
JF - ACS nano
IS - 9
ER -