Organic solvent-assisted synthesis of the K3SiF7:Mn4+ red phosphor with improved morphology and stability. Issue 47 (18th November 2019)

• Record Type: Journal Article
• Authors: Noh, Minhee; Yoon, Dae Ho; Kim, Chang Hae; Lee, Seon Joo
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 47(2019)
• Page Start: 15014
• Page End: 15020
• Publication Date: 2019-11-18
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc04670d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Our organic solvent-assisted synthetic method provides a simple and very effective way to produce a uniform K3 SiF7 :Mn 4+ phosphor with enhanced stability. Abstract : Recently, a novel host, K3 SiF7, for Mn 4+ -activated phosphors was discovered and it was revealed that Mn 4+ -doped K3 SiF7 has an advantage in decay time compared with the most widely used Mn 4+ -doped K2 SiF6 . Here, we developed an organic solvent-assisted synthetic method for the K3 SiF7 :Mn 4+ phosphor. To the best of our knowledge, it is the first publication about a newly developed synthetic method of the K3 SiF7 :Mn 4+ phosphor. Various organic solvents with different functional groups have been tried to synthesize the K3 SiF7 :Mn 4+ phosphor. When we introduced oleylamine (OAm) as an organic solvent, uniform K3 SiF7 :Mn 4+ 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 K3 SiF7 :Mn 4+ 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 A3 MF7 :Mn 4+ (A = alkali metal ion; M = Si, Ge, Zr, etc. ).