Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 18, Issue 12, Pages 8258-8268Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2018.16384
Keywords
Hydrothermal; Rare Earth Ion-Doped NaYF4; Poly(Acrylic Acid); Upconversion Luminescence
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Funding
- National Key Research and Development Program of China [2018YFD0400705]
- National Science Foundation of China [21501056, 21705043]
- National Science Foundation for Post-Doctoral Scientists of China [2018M632981]
- Science Foundation of Hunan Province [218JJ3115, 218JJ3117]
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In this study, well-defined PAA-coated NaYF4:Yb3+, Er3+ nanophosphors were synthesized via a poly(acrylic acid) (PAA) mediated hydrothermal process. The rational control of initial reaction conditions, such as hydrothermal temperature, pH value of precursor-solution, added amount of PAA, and molecular weight of PAA ligand, resulted in upconversion of NaYF4:Yb3+, Er3+ phosphors with varying crystal phases (alpha and beta) and morphologies (e.g., nanosphere, submicrorod, microrod, microtube, and microprism). By assessing the upconversion luminescent properties of the synthesized NaYF4:Yb3+, Er3+ phosphors upon excitation by 980 nm infrared light, it was demonstrated that the beta-phase NaYF4: Yb3+, Er3+ phosphors generally presented stronger upconversion luminescent than alpha-phase NaYF4:Yb3+, Er3+ phosphors and orthorhombic phase of YF3:Yb3+, Er3+ sample. Additionally, the alpha-phase NaYF4: Yb3+, Er3+ phosphors with hollow microtube morphology presented higher upconversion luminescent intensity than phosphors of other morphologies. This may be due to microtubes having larger surface area (inner and outer surfaces), which promoted the absorption efficiency under similar excitation conditions, therefore generating higher luminescent intensity. Findings form this study suggest for precisely controlled growth of other complex rare earth fluoride compounds and provide a reference for exploration of component-, phase- and morphology-dependent upconversion luminescence properties.
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