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Title: Feasible preparation of red-phosphor K₂SiF₆:Mn⁴⁺ coated with SiO₂ for white light emitting diodes application
Authors: Vu, Thi Hong Quan
Doan, Thi Tuyet
Dere, Przemyslaw J.
Nguyen, Pham Trung Hieu
Nguyen, Hoang Duy
Keywords: Fluoride phosphor
Red-emission K₂SiF₆:Mn⁴⁺
Red-emission K₂SiF₆:Mn⁴⁺
Silica coating materials
Issue Date: 2019
Series/Report no.: Vietnam Journal of Chemistry;No 57(03) .- Page.384-388
Abstract: We report a facile approach for coating K₂SiF₆:Mn⁴⁺ red-phosphor with a moisture-resistant silica layervia the one-step co-precipitation using tetraethyl orthosilicate (TEOS) and sodium dodecyl benzene sulphonate (SDBS) surfactant. The bare K₂SiF₆:Mn⁴⁺ (KSF) phosphor with nearly round-shape and 10 µm diameter, showed a high external quantum yield ~0.502 under 460 nm light excitation. The 40 nm- and 80 nm-thick SiO₂ coatinglayers on the phosphor surface was observed via transmission electron microscopy (TEM). The K₂SiF₆:Mn⁴⁺ coated with SiO₂ (KSF@SiO₂) phosphor possesses bright red emission at approximately 630 nm, high thermal stability and excellent waterproof. Effect of coating layer-thickness on photoluminescence properties of the prepared phosphors have been investigated and discussion.
ISSN: 2525-2321
Appears in Collections:Vietnam Journal of Chemistry

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