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

Division for Materials Science

Research output: Contribution to journal › Article

2 Citations (Scopus)

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

Fingerprint

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

Lang, T., Han, T., Fang, S., Wang, J., Cao, S., Peng, L., Liu, B., Korepanov, V. I., & Yakovlev, A. N. (2020). Improved phase stability of the metastable K₂GeF₆:Mn⁴⁺ phosphors with high thermal stability and water-proof property by cation substitution. Chemical Engineering Journal, 380, [122429]. https://doi.org/10.1016/j.cej.2019.122429

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

@article{f5af4ada8bc1486ba93d7854fb88d026,

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",

month = jan

day = "15",

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

language = "English",

volume = "380",

journal = "Chemical Engineering Journal",

issn = "1385-8947",

publisher = "Elsevier",

}

TY - JOUR

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

KW - KGeF:Mn

KW - Metastable phase

KW - Red phosphor

KW - Water-proof

UR - http://www.scopus.com/inward/record.url?scp=85070370736&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85070370736&partnerID=8YFLogxK

U2 - 10.1016/j.cej.2019.122429

DO - 10.1016/j.cej.2019.122429

M3 - Article

AN - SCOPUS:85070370736

VL - 380

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

M1 - 122429

ER -

Access to Document

10.1016/j.cej.2019.122429