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Open AccessArticle

Up-Conversion Luminescence Properties of Lanthanide-Gold Hybrid Nanoparticles as Analyzed with Discrete Dipole Approximation

by Ruichan Lv 1,2,*, Miao Feng 1 and Wolfgang J. Parak 2,3
1
Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi’an 710071, China
2
Fachbereich Physik, Philipps Universitat Marburg, 35037 Marburg, Germany
3
CHyN, Universität Hamburg, 22607 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 989; https://doi.org/10.3390/nano8120989
Received: 20 October 2018 / Revised: 23 November 2018 / Accepted: 26 November 2018 / Published: 29 November 2018
Up-conversion nanoparticles (UCNP) under near-infrared (NIR) light irradiation have been well investigated in the field of bio-imaging. However, the low up-conversion luminescence (UCL) intensity limits applications. Plasmonic modulation has been proposed as an effective tool to adjust the luminescence intensity and lifetime. In this study discrete dipole approximation (DDA) was explored concerning guiding the design of [email protected]2-Au structures with enhanced UCL intensity. The extinction effects of gold shells could be changed by adjusting the distance between the UCNPs and the Au NPs by synthesized tunable mesoporous silica (mSiO2) spacers. Enhanced UCL was obtained under 808 nm irradiation. The original theoretical predictions could not be demonstrated to full extend by experimental data, indicating that better models for simulation need to take into account in homogeneities in particle morphologies. Yet, one very certain conclusion resulting from the DDA calculations and experiments is that the absorbance can blue-shift with more Au NPs added and the absorbance can-red shift for samples with enhanced silica sizes in the [email protected]2-Au structures. Furthermore, when the DDA model is more consistent with the practical structure (dispersed Au NPs instead of Au shell), the theoretical absorbance occurs almost the same as the practical absorbance. All in all, the DDA could fit the extinction effect of Au perfectly and be suitable for guiding how to design the UCNP and Au. View Full-Text
Keywords: up conversion nanoparticles; discrete dipole approximation; surface plasmon resonance; lanthanide-based composites up conversion nanoparticles; discrete dipole approximation; surface plasmon resonance; lanthanide-based composites
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MDPI and ACS Style

Lv, R.; Feng, M.; Parak, W.J. Up-Conversion Luminescence Properties of Lanthanide-Gold Hybrid Nanoparticles as Analyzed with Discrete Dipole Approximation. Nanomaterials 2018, 8, 989.

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