Feasible preparation of red-phosphor K2SiF6:Mn4+coated with SiO2 for white light emitting diodes application

Vu Thi Hong Quan, Doan Thi Tuyet, Przemysław J. Dereń, Nguyen Pham Trung Hieu, Nguyen Hoang Duy

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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 languageEnglish (US)
Pages (from-to)384-388
Number of pages5
JournalVietnam Journal of Chemistry
Volume57
Issue number3
DOIs
StatePublished - Jun 2019

All Science Journal Classification (ASJC) codes

  • General Chemistry

Keywords

  • Fluoride phosphor
  • red-emission KSiF:Mn
  • silica coating materials

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