Flame Synthesis of Complex Fluoride-Based Nanoparticles as Upconversion Phosphors

Stepuk, Alexander; Krämer, Karl; Stark, Wendelin J. (2013). Flame Synthesis of Complex Fluoride-Based Nanoparticles as Upconversion Phosphors. KONA: Powder and Particle Journal(30), pp. 267-275. Hosokawa Powder Technology Foundation

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Recent improvements in precursor chemistry, reactor geometry and run conditions extend the manufacturing capability of traditional flame aerosol synthesis of oxide nanoparticles to metals, alloys and inorganic complex salts. As an example of a demanding composition, we demonstrate here the one-step flame synthesis of nanoparticles of a 4-element non-oxide phosphor for upconversion applications. The phosphors are characterized in terms of emission capability, phase purity and thermal phase evolution. The preparation of flame-made beta-NaYF4 with dopants of Yb, Tm or Yb, Er furthermore illustrates the now available nanoparticle synthesis tool boxes based on modified flamespray synthesis from our laboratories at ETH Zurich. Since scaling concepts for flame synthesis, including large-scale filtration and powder handling, have become available commercially, the development of industrial applications of complex nanoparticles of metals, alloys or most other
thermally stable, inorganic compounds can now be considered a feasible alternative to traditional top-down manufacturing or liquid-intense wet chemistry.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Krämer, Karl

Subjects:

500 Science > 540 Chemistry

ISSN:

0288-4534

Publisher:

Hosokawa Powder Technology Foundation

Language:

English

Submitter:

Karl Krämer

Date Deposited:

16 Dec 2013 16:27

Last Modified:

05 Dec 2014 22:09

Web of Science ID:

000314476300023

Uncontrolled Keywords:

flame pyrolysis, upconversion, sodium yttrium fluoride, rare earth, luminescence, nanoparticles

BORIS DOI:

10.7892/boris.39102

URI:

https://boris.unibe.ch/id/eprint/39102

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