A novel Mn4+‐activated red phosphor for use in light emitting diodes, K3SiF7:Mn4+. Issue 3 (23rd December 2016)

• Record Type: Journal Article
• Authors: Kim, Minseuk; Park, Woon Bae; Bang, Bokeuk; Kim, Chang Hae; Sohn, Kee‐Sun
• Is Part Of: Journal of the American Ceramic Society. Volume 100:Issue 3(2017)
• Page Start: 1044
• Page End: 1050
• Publication Date: 2016-12-23
• Subjects: luminescence -- phosphors -- polycrystalline materials -- structure; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.14655
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Phosphors that exhibit a narrow red emission are particularly interesting due to the advantage of providing a more extensive color gamut and better rendering in LED applications such as displays and solid‐state lighting. Although some Eu 2+ ‐activated nitridosilicates have been discovered in this regard, K2 SiF6 :Mn 4+ phosphors are the only option in actual LED applications thus far. We discovered a novel phosphor, K3 SiF7 :Mn 4+, with P 4/ mbm symmetry. The luminescent properties of K3 SiF7 :Mn 4+ are almost identical to those of the K2 SiF6 :Mn 4+ phosphor, but its materials identity is distinct due to a completely different crystallographic structure, which leads to reduced decay time. The fast decay is one of the most serious disadvantages of existing K2 SiF6 :Mn 4+ phosphors. The K3 SiF7 :Mn 4+ phosphor was examined in comparison to the K2 SiF6 :Mn 4+ via density functional theory calculation, Rietveld refinement, X‐ray photoelectron spectroscopy, X‐ray absorption near‐edge structure spectroscopy, and time‐resolved photoluminescence.