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Graphene Quantum Dots-Driven Multiform Morphologies of β‑NaYF4:Gd3+/Tb3+ Phosphors: The Underlying Mechanism and Their Optical Properties
journal contribution
posted on 2018-02-13, 09:13 authored by Monika Malik, Preeti Padhye, Pankaj PoddarDimension
and shape tunable architectures of inorganic crystals
are of extreme interest because of morphology-dependent modulation
of the properties of the materials. Herein, for the first time, we
present a novel impurity-driven strategy where we studied the influence
of in situ incorporation of graphene quantum dots (GQDs) on the growth
of β-NaYF4:Gd3+/Tb3+ phosphor
crystals via a hydrothermal route. The GQDs function as a nucleation
site and by changing the concentration of GQDs, the morphology of
β-NaYF4:Gd3+/Tb3+ phosphors
was changed from rod to flowerlike structure to disklike structure,
without phase transformation. The influence of size and functionalization
of GQDs on the size and shape of phosphor crystals were also systematically
studied and discussed. Plausible mechanisms of formation of multiform
morphologies are proposed based on the heterogeneous nucleation and
growth. Most interestingly, the experimental results indicate that
the photoluminescence properties of β-NaYF4:Gd3+/Tb3+ phosphor crystals are strongly dependent
on the crystallite size and morphology. This study would be suggestive
for the precisely controlled growth of inorganic crystals; consequently,
it will open new avenues and thus may possess potential applications
in the field of materials and biological sciences.
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Keywords
multiform morphologiesmorphology-dependent modulationGQDs functionOptical Properties Dimensionnucleation siteGdβ- NaYF 4photoluminescence propertiescrystallite sizeshape tunable architecturesphosphor crystalsdisklike structurehydrothermal routegraphene quantum dotsGraphene Quantum Dots-Driven Multiform MorphologiesinfluenceTbnovel impurity-driven strategymaterialphase transformationPlausible mechanismsflowerlike structure
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