Late‐News Poster: Chemical Stability Enhancement of K2SiF6:Mn4+ by Metal (Oxide) Coating. Issue 1 (June 2014)

• Record Type: Journal Article
• Authors: Deressa, Gemechu; Jeong, Hyoungseak; Park, Seongwoo; Lim, Seokgyu; Lee, Changyup; Kim, Hyunjong; Kim, Jongsu
• Is Part Of: Digest of technical papers. Volume 45:Issue 1(2014)
• Page Start: 1324
• Page End: 1324
• Publication Date: 2014-06
• Subjects: Information display systems -- Congresses; 621.3815422
• DOI: 10.1002/j.2168-0159.2014.tb00348.x
• Languages: English
• ISSNs: 0097-966X

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>The K₂SiF₆:Mn⁴⁺ phosphor was synthesized by a redox reaction from SiO₂ [1]. Under the 450 nm excitation, K₂SiF₆:Mn⁴⁺ show a narrow deep‐red emitting around 633 nm which attributed to the ²E_g to ⁴A_2g transition of Mn⁴⁺ ion with the half width of 8 ‐10 nm. The particle size was approximately 8 μm. We obtained single phase of cubic structure with a space group of Fm‐3m (225) which agree with XRD pattern of JCPDS # 85‐1382. In the temperature dependence of emission spectra, emission intensity decrease to around 60 % (80%@200°C YAG) of that at room temperature is about 175°C. The chemical stability of the phosphors was improved by coating the phosphor with target metal oxide. These phosphors can be efficiently excited by the blue light‐emitting InGaN diode and provides a high color rendering property with green or yellow phosphors. It will be useful as a red phosphor for white‐light‐emitting diode.</p> </abstract>