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Controlled Isotropic and Anisotropic Shell Growth in β-NaLnF4 Nanocrystals Induced by Precursor Injection Rate

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.7b07496· OSTI ID:1532260
 [1];  [1];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry and Dept. of Materials Science and Engineering; Kavli Energy NanoScience Inst., Berkeley, CA (United States)

Precise morphology and composition control is vital for designing multifunctional lanthanide-doped core/shell nanocrystals. Herein, we report controlled isotropic and anisotropic shell growth techniques in hexagonal sodium rare-earth tetrafluoride (β-NaLnF4) nanocrystals by exploiting the kinetics of the shell growth. A drastic change of the shell morphology was observed by changing the injection rate of the shell precursors while keeping all other reaction conditions constant. We obtained isotropic shell growth for fast sequential injection and a preferred growth of the shell layers along the crystal's c-axis [001] for slow dropwise injection. Using this slow shell growth technique, we have grown rod-like shells around different almost spherical core nanocrystals. Bright and efficient upconversion was measured for both isotropic and rod-like shells around β-NaYF4 nanocrystals doped with Yb3+/Er3+ and Yb3+/Tm3+. Photoluminescence upconversion quantum yield and lifetime measurements reveal the high quality of the core/shell nanocrystal. Furthermore, multishell rod-like nanostructures have been prepared with optically active cores and tips separated by an inert intermediate shell layer. The controlled anisotropic shell growth allows the design of new core/multishell nanostructures and enables independent investigations of the chemistry and physics of different nanocrystal facets.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); German Research Foundation (DFG)
Grant/Contract Number:
AC02-05CH11231; SC0001293
OSTI ID:
1532260
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 35 Vol. 139; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (46)

The Active-Core/Active-Shell Approach: A Strategy to Enhance the Upconversion Luminescence in Lanthanide-Doped Nanoparticles journal September 2009
The Fluoride Host: Nucleation, Growth, and Upconversion of Lanthanide-Doped Nanoparticles journal March 2015
Upconversion for Photovoltaics - a Review of Materials, Devices and Concepts for Performance Enhancement journal April 2015
Green-Emitting CePO4:Tb/LaPO4 Core–Shell Nanoparticles with 70 % Photoluminescence Quantum Yield journal November 2003
Direct Evidence of a Surface Quenching Effect on Size-Dependent Luminescence of Upconversion Nanoparticles journal August 2010
Synthesis of 10 nm β-NaYF 4 :Yb,Er/NaYF 4 Core/Shell Upconversion Nanocrystals with 5 nm Particle Cores journal December 2015
Unraveling Epitaxial Habits in the NaLnF4System for Color Multiplexing at the Single-Particle Level journal April 2016
Sodium lanthanide fluoride core-shell nanocrystals: A general perspective on epitaxial shell growth journal June 2013
Sequential growth of sandwiched NaYF4:Yb/Er@NaYF4:Yb@NaNdF4:Yb core–shell–shell nanoparticles for photodynamic therapy journal December 2015
Highly efficient near-infrared to visible up-conversion process in journal July 2005
Lanthanide-Doped Energy Cascade Nanoparticles: Full Spectrum Emission by Single Wavelength Excitation journal April 2015
Study on the Intermixing of Core and Shell in NaEuF 4 /NaGdF 4 Core/Shell Nanocrystals journal December 2015
Energy-Cascaded Upconversion in an Organic Dye-Sensitized Core/Shell Fluoride Nanocrystal journal October 2015
Precise Tuning of Surface Quenching for Luminescence Enhancement in Core–Shell Lanthanide-Doped Nanocrystals journal October 2016
Optimal Sensitizer Concentration in Single Upconversion Nanocrystals journal April 2017
Dye-Sensitized Core/Active Shell Upconversion Nanoparticles for Optogenetics and Bioimaging Applications journal December 2015
Energy-Looping Nanoparticles: Harnessing Excited-State Absorption for Deep-Tissue Imaging journal September 2016
Water-Soluble NaYF 4 :Yb,Er(Tm)/NaYF 4 /Polymer Core/Shell/Shell Nanoparticles with Significant Enhancement of Upconversion Fluorescence journal February 2007
Different Microstructures of β-NaYF 4 Fabricated by Hydrothermal Process:  Effects of pH Values and Fluoride Sources journal October 2007
Size-Tunable, Ultrasmall NaGdF 4 Nanoparticles: Insights into Their T 1 MRI Contrast Enhancement journal August 2011
Successive Layer-by-Layer Strategy for Multi-Shell Epitaxial Growth: Shell Thickness and Doping Position Dependence in Upconverting Optical Properties journal December 2012
High-Quality Sodium Rare-Earth Fluoride Nanocrystals:  Controlled Synthesis and Optical Properties journal May 2006
Self-Focusing by Ostwald Ripening: A Strategy for Layer-by-Layer Epitaxial Growth on Upconverting Nanocrystals journal June 2012
Mechanistic Investigation of Photon Upconversion in Nd 3+ -Sensitized Core–Shell Nanoparticles journal August 2013
Multicolor Barcoding in a Single Upconversion Crystal journal March 2014
Calculated Absorption and Scattering Properties of Gold Nanoparticles of Different Size, Shape, and Composition:  Applications in Biological Imaging and Biomedicine journal April 2006
Size- and Phase-Controlled Synthesis of Monodisperse NaYF4:Yb,Er Nanocrystals from a Unique Delayed Nucleation Pathway Monitored with Upconversion Spectroscopy journal September 2007
Highly Efficient Multicolor Up-Conversion Emissions and Their Mechanisms of Monodisperse NaYF 4 :Yb,Er Core and Core/Shell-Structured Nanocrystals journal August 2007
Direct Imaging the Upconversion Nanocrystal Core/Shell Structure at the Subnanometer Level: Shell Thickness Dependence in Upconverting Optical Properties journal May 2012
Prevalence of Anisotropic Shell Growth in Rare Earth Core–Shell Upconversion Nanocrystals journal April 2013
Lanthanide-Based Heteroepitaxial Core–Shell Nanostructures: Compressive versus Tensile Strain Asymmetry journal October 2014
Three-dimensional controlled growth of monodisperse sub-50 nm heterogeneous nanocrystals journal January 2016
Multicolour synthesis in lanthanide-doped nanocrystals through cation exchange in water journal October 2016
Temporal full-colour tuning through non-steady-state upconversion journal January 2015
Enhancing solar cell efficiency: the search for luminescent materials as spectral converters journal January 2013
Upconversion luminescence with tunable lifetime in NaYF 4 :Yb,Er nanocrystals: role of nanocrystal size journal January 2013
Photon upconversion in core–shell nanoparticles journal January 2015
Light upconverting core–shell nanostructures: nanophotonic control for emerging applications journal January 2015
Optical nanoprobes for biomedical applications: shining a light on upconverting and near-infrared emitting nanoparticles for imaging, thermal sensing, and photodynamic therapy journal January 2017
Absolute quantum yield measurements of colloidal NaYF4: Er3+, Yb3+ upconverting nanoparticles journal January 2010
Upconverting core-shell nanocrystals with high quantum yield under low irradiance: On the role of isotropic and thick shells journal November 2015
Morphologically controlled synthesis of colloidal upconversion nanophosphors and their shape-directed self-assembly journal December 2010
An efficient and user-friendly method for the synthesis of hexagonal-phase NaYF 4 :Yb, Er/Tm nanocrystals with controllable shape and upconversion fluorescence journal July 2008
Linearly Polarized Emission from Colloidal Semiconductor Quantum Rods journal May 2001
The Spectra of the Doubly and Triply Ionized Rare Earths journal January 1963
Design of plasmonic nanoantennae for enhancing spontaneous emission journal January 2007

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