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

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(Ge_1-xSi_x)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 language	English
Article number	122429
Journal	Chemical Engineering Journal
Volume	380
DOIs	https://doi.org/10.1016/j.cej.2019.122429
Publication status	Published - 15 Jan 2020

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

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10.1016/j.cej.2019.122429

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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 journal › Article › peer-review

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

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.",

keywords = "High thermal stability, KGeF:Mn, Metastable phase, Red phosphor, Water-proof",

author = "Tianchun Lang and Tao Han and Shuangqiang Fang and J. Wang and Shixiu Cao and Lingling Peng and B. Liu and Korepanov, {Vladimir I.} and Yakovlev, {Aleksey N.}",

year = "2020",

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doi = "10.1016/j.cej.2019.122429",

language = "English",

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T1 - Improved phase stability of the metastable K2GeF6:Mn4+ phosphors with high thermal stability and water-proof property by cation substitution

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.

PY - 2020/1/15

Y1 - 2020/1/15

N2 - 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.

AB - 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.

KW - High thermal stability

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KW - Metastable phase

KW - Red phosphor

KW - Water-proof

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