Waterproof Alkyl Phosphate Coated Fluoride Phosphors for Optoelectronic Materials

Hoang Duy Nguyen, Chun Che Lin, Ru Shi Liu

Research output: Contribution to journalArticlepeer-review

149 Citations (Scopus)


A facile approach for coating red fluoride phosphors with a moisture-resistant alkyl phosphate layer with a thickness of 50-100 nm is reported. K2SiF6:Mn4+ particles were prepared by co-precipitation and then coated by esterification of P2O5 with alcohols (methanol, ethanol, and isopropanol). This route was adopted to encapsulate the prepared phosphors using transition-metal ions as cross-linkers between the alkyl phosphate moieties. The coated phosphor particles exhibited a high water tolerance and retained approximately 87% of their initial external quantum efficiency after aging under high-humidity (85%) and higherature (85°C) conditions for one month. Warm white-light-emitting diodes that consisted of blue InGaN chips, the prepared K2SiF6:Mn4+ phosphors, and either yellow Y3Al5O12:Ce3+ phosphors or green β-SiAlON: Eu2+ phosphors showed excellent color rendition.

Original languageEnglish
Pages (from-to)10862-10866
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number37
Publication statusPublished - Sept 1 2015
Externally publishedYes


  • light-emitting diodes
  • phosphors
  • photoluminescence
  • white light

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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