A novel Mn4+‐activated red phosphor for use in light emitting diodes,K3SiF7:Mn4+ |
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Authors: | Minseuk Kim Woon Bae Park Bokeuk Bang Chang Hae Kim Kee‐Sun Sohn |
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Affiliation: | 1. Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul, Korea;2. Korea Research Institute of Chemical Technology, Daejeon, Korea |
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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 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. |
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Keywords: | luminescence phosphors polycrystalline materials structure |
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