NDLI: Synthesis-driven, structure-dependent optical behavior in phase-tunable NaYF<sub>4</sub>:Yb,Er-based motifs and associated heterostructures

Content Provider	Royal Society of Chemistry (RSC)
Author	Wong, Stanislaus S. Routh, Prahlad Kumar Liu, Haiqing Lewis, Crystal S. McBean, Coray Han, Jinkyu Cotlet, Mircea
Copyright Year	2017
Abstract	Understanding the key parameters necessary for generating uniform Er,Yb co-activated NaYF4 possessing various selected phases (i.e. cubic or hexagonal) represents an important chemical strategy towards tailoring optical behavior in these systems. Herein, we report on a straightforward hydrothermal synthesis in which the separate effects of reaction temperature, reaction time, and precursor stoichiometry in the absence of any surfactant were independently investigated. Interestingly, the presence and the concentration of NH4OH appear to be the most critical determinants of the phase and morphology. For example, with NH4OH as an additive, we have observed the formation of novel hierarchical nanowire bundles which possess overall lengths of ∼5 μm and widths of ∼1.5 μm but are composed of constituent component sub-units of long, ultrathin (∼5 nm) nanowires. These motifs have yet to be reported as distinctive morphological manifestations of fluoride materials. The optical properties of as-generated structures have also been carefully analyzed. Specifically, we have observed tunable, structure-dependent energy transfer behavior associated with the formation of a unique class of NaYF4–CdSe quantum dot (QD) heterostructures, incorporating zero-dimensional (0D), one-dimensional (1D), and three-dimensional (3D) NaYF4 structures. Our results have demonstrated the key roles of the intrinsic morphology-specific physical surface area and porosity as factors in governing the resulting opto-electronic behavior. Specifically, the trend in energy transfer efficiency correlates well with the corresponding QD loading within these heterostructures, thereby implying that the efficiency of FRET appears to be directly affected by the amount of QDs immobilized onto the external surfaces of the underlying fluoride host materials.
Starting Page	2153
Ending Page	2167
Page Count	15
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	3
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c6cp07648c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Stoichiometry Förster resonance energy transfer Quantum dot Hydrothermal synthesis Fluoride Micrometre Nanowire Dimension Porosity Surfactant
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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