A novel Mn4+‐activated red phosphor for use in light emitting diodes, K3SiF7:Mn4

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 Eu2+‐activated nitridosilicates have been discovered in this rega...

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Published inJournal of the American Ceramic Society Vol. 100; no. 3; pp. 1044 - 1050
Main Authors Kim, Minseuk, Park, Woon Bae, Bang, Bokeuk, Kim, Chang Hae, Sohn, Kee‐Sun
Format Journal Article
LanguageEnglish
Published Columbus Wiley Subscription Services, Inc 01.03.2017
Subjects
Light emitting diodes
luminescence
phosphors
polycrystalline materials
Spectrum analysis
structure
Toxicity
X-rays
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Summary: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 Eu2+‐activated nitridosilicates have been discovered in this regard, K2SiF6:Mn4+ phosphors are the only option in actual LED applications thus far. We discovered a novel phosphor, K3SiF7:Mn4+, with P4/mbm symmetry. The luminescent properties of K3SiF7:Mn4+ are almost identical to those of the K2SiF6:Mn4+ 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 K2SiF6:Mn4+ phosphors. The K3SiF7:Mn4+ phosphor was examined in comparison to the K2SiF6:Mn4+ via density functional theory calculation, Rietveld refinement, X‐ray photoelectron spectroscopy, X‐ray absorption near‐edge structure spectroscopy, and time‐resolved photoluminescence.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.14655