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Issue 47, 2019
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Organic solvent-assisted synthesis of the K3SiF7:Mn4+ red phosphor with improved morphology and stability

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Abstract

Recently, a novel host, K3SiF7, for Mn4+-activated phosphors was discovered and it was revealed that Mn4+-doped K3SiF7 has an advantage in decay time compared with the most widely used Mn4+-doped K2SiF6. Here, we developed an organic solvent-assisted synthetic method for the K3SiF7:Mn4+ phosphor. To the best of our knowledge, it is the first publication about a newly developed synthetic method of the K3SiF7:Mn4+ phosphor. Various organic solvents with different functional groups have been tried to synthesize the K3SiF7:Mn4+ phosphor. When we introduced oleylamine (OAm) as an organic solvent, uniform K3SiF7:Mn4+ particles below 5 μm were obtained at a lower temperature than the conventional solid state reaction (SSR). As a result of thermal quenching (TQ) and 85/85 tests, it was confirmed that despite its small size, the resulting K3SiF7:Mn4+ has enhanced stability against heat and moisture with the aid of an organic protecting layer. We expect that this organic solvent-assisted synthesis can be applied to the synthesis of other phosphors with a chemical formula of A3MF7:Mn4+ (A = alkali metal ion; M = Si, Ge, Zr, etc.).

Graphical abstract: Organic solvent-assisted synthesis of the K3SiF7:Mn4+ red phosphor with improved morphology and stability

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Publication details

The article was received on 23 Aug 2019, accepted on 06 Nov 2019 and first published on 08 Nov 2019


Article type: Paper
DOI: 10.1039/C9TC04670D
J. Mater. Chem. C, 2019,7, 15014-15020

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    Organic solvent-assisted synthesis of the K3SiF7:Mn4+ red phosphor with improved morphology and stability

    M. Noh, D. H. Yoon, C. H. Kim and S. J. Lee, J. Mater. Chem. C, 2019, 7, 15014
    DOI: 10.1039/C9TC04670D

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