Synthesis of Na2SiF6:Mn4+ red phosphors for white LED applications by co-precipitation

Hoang Duy Nguyen, Chun Che Lin, Mu Huai Fang, Ru Shi Liu

Research output: Contribution to journalArticle

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Abstract

A one-step approach to synthesize Na2SiF6:Mn4+and K2SiF6:Mn4+ red phosphors by co-precipitation is reported in this paper. The phosphors were precipitated from a silicon fluoride solution with NaF and Na2MnO4 (Na2SiF6:Mn4+ preparation) or KF and K2MnO4 (K2SiF6:Mn4+ preparation) using H2O2 to reduce Mn7+ to Mn4+ at room temperature. Na2SiF6:Mn4+ was also prepared through a convenient two-step route with K2MnF6 as a raw material. The obtained Na2SiF6:Mn4+ phosphors have hexagonal structures with space group D3 2-P321 and no impurity phase when they were examined via X-ray diffraction. Photoluminescence, photoluminescence excitation, thermal luminescence, and luminescence decay time were considered to determine the optical properties of the fluoride complexes. The prepared phosphors exhibited bright red emission under 460 nm light excitation and low-thermal quenching (∼92% of the luminescent intensity at 423 K). Increasing the concentration of Mn4+ enhanced the luminescence intensity. A warm white light LED with high color rendering index (Ra = 86 and R9 = 61) was fabricated by employing Na2SiF6:Mn4+ as red phosphors and commercial Y3Al5O12:Ce3+ as yellow phosphors on a blue-InGaN chip.

Original languageEnglish
Pages (from-to)10268-10272
Number of pages5
JournalJournal of Materials Chemistry C
Volume2
Issue number48
DOIs
Publication statusPublished - Dec 28 2014
Externally publishedYes

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Coprecipitation
Phosphors
Light emitting diodes
Luminescence
Photoluminescence
Fluorides
Quenching
Raw materials
Optical properties
Impurities
Color
X ray diffraction
Silicon
Temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Synthesis of Na2SiF6:Mn4+ red phosphors for white LED applications by co-precipitation. / Nguyen, Hoang Duy; Lin, Chun Che; Fang, Mu Huai; Liu, Ru Shi.

In: Journal of Materials Chemistry C, Vol. 2, No. 48, 28.12.2014, p. 10268-10272.

Research output: Contribution to journalArticle

Nguyen, Hoang Duy ; Lin, Chun Che ; Fang, Mu Huai ; Liu, Ru Shi. / Synthesis of Na2SiF6:Mn4+ red phosphors for white LED applications by co-precipitation. In: Journal of Materials Chemistry C. 2014 ; Vol. 2, No. 48. pp. 10268-10272.
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abstract = "A one-step approach to synthesize Na2SiF6:Mn4+and K2SiF6:Mn4+ red phosphors by co-precipitation is reported in this paper. The phosphors were precipitated from a silicon fluoride solution with NaF and Na2MnO4 (Na2SiF6:Mn4+ preparation) or KF and K2MnO4 (K2SiF6:Mn4+ preparation) using H2O2 to reduce Mn7+ to Mn4+ at room temperature. Na2SiF6:Mn4+ was also prepared through a convenient two-step route with K2MnF6 as a raw material. The obtained Na2SiF6:Mn4+ phosphors have hexagonal structures with space group D3 2-P321 and no impurity phase when they were examined via X-ray diffraction. Photoluminescence, photoluminescence excitation, thermal luminescence, and luminescence decay time were considered to determine the optical properties of the fluoride complexes. The prepared phosphors exhibited bright red emission under 460 nm light excitation and low-thermal quenching (∼92{\%} of the luminescent intensity at 423 K). Increasing the concentration of Mn4+ enhanced the luminescence intensity. A warm white light LED with high color rendering index (Ra = 86 and R9 = 61) was fabricated by employing Na2SiF6:Mn4+ as red phosphors and commercial Y3Al5O12:Ce3+ as yellow phosphors on a blue-InGaN chip.",
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