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.
Original language | English (US) |
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Pages (from-to) | 384-388 |
Number of pages | 5 |
Journal | Vietnam Journal of Chemistry |
Volume | 57 |
Issue number | 3 |
DOIs | |
State | Published - Jun 2019 |
All Science Journal Classification (ASJC) codes
- General Chemistry
Keywords
- Fluoride phosphor
- red-emission KSiF:Mn
- silica coating materials