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Controlled Synthesis and Water Dispersibility of Hexagonal Phase NaGdF4:Ho3+/Yb3+ Nanoparticles

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The luminescence properties of hexagonal sodium gadolinium fluoride nanoparticles co-doped with
Ho3+ and Yb3+ (NaGdF4:Ho3+/Yb3+), prepared using a thermal decomposition synthesis route, were
evaluated following 980 nm excitation. The synthesized nanoparticles were easily dispersed in nonpolar
solvents, showed an extremely narrow particle distribution, and were determined to have a mean diameter
of 15.6 ( 1.2 nm. The predominantly green upconversion emission was observed to increase with
increasing Ho3+ concentration due to an enhanced energy transfer (ET) from the neighboring Yb3+ ions.
Post-synthesis, the nanoparticles were dispersed in water via modification of the capping oleic acid (OA)
ligand. Upconversion emission intensity was observed to decrease upon dispersion in aqueous media
likely due to an increase in nonradiative decay pathways. A total ligand exchange with poly(acrylic acid)
(PAA) resulted in slightly more intense upconversion emission relative to oxidation of the OA to azelaic
acid.

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Informasi Detail

Judul Seri

Chemistry of Materials

No. Panggil

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Penerbit

Washington, DC : American Chemical Society., 2009

Deskripsi Fisik

Chem. Mater. 2009, 21, 717–723

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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