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- Title
Plasmonic Dual-Enhancement and Precise Color Tuning of Gold Nanorod@SiO<sub>2</sub> Coupled Core-Shell-Shell Upconversion Nanocrystals.
- Authors
Kang, Fengwen; He, Jijun; Sun, Tianying; Bao, Zhi Yong; Wang, Feng; Lei, Dang Yuan
- Abstract
The last decade has witnessed the remarkable research progress of lanthanide-doped upconversion nanocrystals (UCNCs) at the forefront of promising applications. However, the future development and application of UCNCs are constrained greatly by their underlying shortcomings such as significant nonradiative processes, low quantum efficiency, and single emission colors. Here a hybrid plasmonic upconversion nanostructure consisting of a GNR@SiO2 coupled with NaGdF4:Yb3+,Nd3+@NaGdF4:Yb3+,Er3+@NaGdF4 core-shell-shell UCNCs is rationally designed and fabricated, which exhibits strongly enhanced UC fluorescence (up to 20 folds) and flexibly tunable UC colors. The experimental findings show that controlling the SiO2 spacer thickness enables readily manipulating the intensity ratio of the Er3+ red, green, and blue emissions, thereby allowing us to achieve the emission color tuning from pale yellow to green upon excitation at 808 nm. Electrodynamic simulations reveal that the tunable UC colors are due to the interplay of plasmon-mediated simultaneous excitation and emission enhancements in the Er3+ green emission yet only excitation enhancement in the blue and red emissions. The results not only provide an upfront experimental design for constructing hybrid plasmonic UC nanostructures with high efficiency and color tunability, but also deepen the understanding of the interaction mechanism between the Er3+ emissions and plasmon resonances in such complex hybrid nanostructure.
- Subjects
GOLD nanoparticles; PHOTON upconversion; NANOCRYSTALS; FLUORESCENCE; ELECTRODYNAMICS; SURFACE plasmon resonance
- Publication
Advanced Functional Materials, 2017, pn/a
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.201701842