Synthesis of Mn4+ activated Na2SiF6 red-emitting phosphors using an ionic liquid

Jungmin Ha, Ekaterina Novitskaya, Natalie Lam, Maritza Sanchez, Yoon Hwa Kim, Zezhou Li, Won Bin Im, Olivia A. Graeve, Joanna McKittrick

Research output: Contribution to journalArticle

Abstract

For the first time, the synthesis of Na2SiF6 powders was achieved through an ionothermal reaction using an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate, without using toxic hydrogen fluoride (HF). Next, these powders were used as a host material to produce the red-emitting phosphor, Na2Si1-xMnxF6 (x = 0.007–0.200), that was synthesized using a low concentration HF solution with dissolved NaMnO4 as the Mn4+ source. The phosphors exhibited red-emission at 610 nm, 618 nm, 629 nm, and 644 nm from the 2Eg4A2g energy levels of Mn4+ under 460 nm excitation. The Na2SiF6 particles were non-agglomerated rod-shaped (~560 nm in length and ~230 nm in diameter), while the Na2Si1-xMnxF6 particles were spherically-shaped (~500 nm in diameter). Both of those powders were found to be much smaller than typical fluoride powders, which enables them to potentially improve the efficiency of phosphor-converted white-light-emitting diodes.

Original languageEnglish
Article number116835
JournalJournal of Luminescence
Volume218
DOIs
StatePublished - 2020 Feb

Fingerprint

Ionic Liquids
Phosphors
Powders
phosphors
Hydrofluoric Acid
hydrofluoric acid
synthesis
liquids
Poisons
Fluorides
Electron energy levels
Light emitting diodes
fluorides
low concentrations
rods
light emitting diodes
energy levels
Light
excitation

Keywords

  • Fluoride phosphors
  • Ionic liquid
  • LEDs
  • Mn
  • Red-emitting
  • Solid-state lighting

Cite this

Ha, J., Novitskaya, E., Lam, N., Sanchez, M., Kim, Y. H., Li, Z., ... McKittrick, J. (2020). Synthesis of Mn4+ activated Na2SiF6 red-emitting phosphors using an ionic liquid. Journal of Luminescence, 218, [116835]. https://doi.org/10.1016/j.jlumin.2019.116835
Ha, Jungmin ; Novitskaya, Ekaterina ; Lam, Natalie ; Sanchez, Maritza ; Kim, Yoon Hwa ; Li, Zezhou ; Im, Won Bin ; Graeve, Olivia A. ; McKittrick, Joanna. / Synthesis of Mn4+ activated Na2SiF6 red-emitting phosphors using an ionic liquid. In: Journal of Luminescence. 2020 ; Vol. 218.
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abstract = "For the first time, the synthesis of Na2SiF6 powders was achieved through an ionothermal reaction using an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate, without using toxic hydrogen fluoride (HF). Next, these powders were used as a host material to produce the red-emitting phosphor, Na2Si1-xMnxF6 (x = 0.007–0.200), that was synthesized using a low concentration HF solution with dissolved NaMnO4 as the Mn4+ source. The phosphors exhibited red-emission at 610 nm, 618 nm, 629 nm, and 644 nm from the 2Eg → 4A2g energy levels of Mn4+ under 460 nm excitation. The Na2SiF6 particles were non-agglomerated rod-shaped (~560 nm in length and ~230 nm in diameter), while the Na2Si1-xMnxF6 particles were spherically-shaped (~500 nm in diameter). Both of those powders were found to be much smaller than typical fluoride powders, which enables them to potentially improve the efficiency of phosphor-converted white-light-emitting diodes.",
keywords = "Fluoride phosphors, Ionic liquid, LEDs, Mn, Red-emitting, Solid-state lighting",
author = "Jungmin Ha and Ekaterina Novitskaya and Natalie Lam and Maritza Sanchez and Kim, {Yoon Hwa} and Zezhou Li and Im, {Won Bin} and Graeve, {Olivia A.} and Joanna McKittrick",
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Ha, J, Novitskaya, E, Lam, N, Sanchez, M, Kim, YH, Li, Z, Im, WB, Graeve, OA & McKittrick, J 2020, 'Synthesis of Mn4+ activated Na2SiF6 red-emitting phosphors using an ionic liquid', Journal of Luminescence, vol. 218, 116835. https://doi.org/10.1016/j.jlumin.2019.116835

Synthesis of Mn4+ activated Na2SiF6 red-emitting phosphors using an ionic liquid. / Ha, Jungmin; Novitskaya, Ekaterina; Lam, Natalie; Sanchez, Maritza; Kim, Yoon Hwa; Li, Zezhou; Im, Won Bin; Graeve, Olivia A.; McKittrick, Joanna.

In: Journal of Luminescence, Vol. 218, 116835, 02.2020.

Research output: Contribution to journalArticle

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T1 - Synthesis of Mn4+ activated Na2SiF6 red-emitting phosphors using an ionic liquid

AU - Ha, Jungmin

AU - Novitskaya, Ekaterina

AU - Lam, Natalie

AU - Sanchez, Maritza

AU - Kim, Yoon Hwa

AU - Li, Zezhou

AU - Im, Won Bin

AU - Graeve, Olivia A.

AU - McKittrick, Joanna

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AB - For the first time, the synthesis of Na2SiF6 powders was achieved through an ionothermal reaction using an ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate, without using toxic hydrogen fluoride (HF). Next, these powders were used as a host material to produce the red-emitting phosphor, Na2Si1-xMnxF6 (x = 0.007–0.200), that was synthesized using a low concentration HF solution with dissolved NaMnO4 as the Mn4+ source. The phosphors exhibited red-emission at 610 nm, 618 nm, 629 nm, and 644 nm from the 2Eg → 4A2g energy levels of Mn4+ under 460 nm excitation. The Na2SiF6 particles were non-agglomerated rod-shaped (~560 nm in length and ~230 nm in diameter), while the Na2Si1-xMnxF6 particles were spherically-shaped (~500 nm in diameter). Both of those powders were found to be much smaller than typical fluoride powders, which enables them to potentially improve the efficiency of phosphor-converted white-light-emitting diodes.

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