Improved phase stability of the metastable K2GeF6:Mn4+ phosphors with high thermal stability and water-proof property by cation substitution

Tianchun Lang, Tao Han, Shuangqiang Fang, J. Wang, Shixiu Cao, Lingling Peng, B. Liu, Vladimir I. Korepanov, Aleksey N. Yakovlev

Research output: Contribution to journalArticle

Abstract

K2GeF6:Mn4+ (KGFM) phosphors with very poor water-proof property in HF solution transform automatically from P63mc hexagonal phase to P3¯m1 trigonal phase. By substituting Ge4+ ion with Si4+ ion, the metastable P63mc hexagonal K2(Ge1-xSix)F6:Mn4+ (KGSFM) with an obvious zero-phonon line peaking at 623.8 nm is stabilized in HF solution. When x = 0.3, the photoluminescence intensity of KGSFM keeps 78% after 168 h in water as well as it increases by 14% at 150 °C (423 K) more than that of KGFM. By using KGSFM the fabricated WLEDs exhibit the high color-rendering index (Ra = 92) and low correlated color temperature (CCT = 3810 K). These results demonstrate that KGSFM solid solution with efficient red emission, meritorious water-proof and high thermal stability is a promising phosphor for the commercial application in the WLEDs and wide-gamut displays.

Original languageEnglish
Article number122429
JournalChemical Engineering Journal
Volume380
DOIs
Publication statusPublished - 15 Jan 2020

Fingerprint

Phase stability
Phosphors
Cations
substitution
Thermodynamic stability
Substitution reactions
cation
Positive ions
Water
Ions
Color
ion
solid solution
water
Solid solutions
Photoluminescence
transform
Display devices
temperature
Temperature

Keywords

  • High thermal stability
  • KGeF:Mn
  • Metastable phase
  • Red phosphor
  • Water-proof

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Improved phase stability of the metastable K2GeF6:Mn4+ phosphors with high thermal stability and water-proof property by cation substitution. / Lang, Tianchun; Han, Tao; Fang, Shuangqiang; Wang, J.; Cao, Shixiu; Peng, Lingling; Liu, B.; Korepanov, Vladimir I.; Yakovlev, Aleksey N.

In: Chemical Engineering Journal, Vol. 380, 122429, 15.01.2020.

Research output: Contribution to journalArticle

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AU - Lang, Tianchun

AU - Han, Tao

AU - Fang, Shuangqiang

AU - Wang, J.

AU - Cao, Shixiu

AU - Peng, Lingling

AU - Liu, B.

AU - Korepanov, Vladimir I.

AU - Yakovlev, Aleksey N.

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